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22-102123-UP-TIR-05-26-2022 Civil Engineering || Entitlement Services || Project Management Preliminary Technical Information Report May 3, 2022 PROJECT Federal Way Public Schools Memorial Stadium 1300 South 308th Street Federal Way, WA 98003 Project No: 21049 OWNER/APPLICANT Tim Ausink Federal Way Public Schools 33330 8th Avenue South Federal Way, WA 98003 PREPARED BY Trevor McDonald, PE Civil Engineer REVIEWED BY Lucas Johnson, PE, LEED AP Project Manager Preliminary Technical Information Report May 3, 2022 PROJECT Federal Way Public Schools Memorial Stadium 1300 South 308th Street Federal Way, WA 98003 Project No: 21049 OWNER/APPLICANT Tim Ausink Federal Way Public Schools 33330 8th Avenue South Federal Way, WA 98003 PREPARED BY Trevor McDonald, PE Civil Engineer REVIEWED BY Lucas Johnson, PE, LEED AP Project Manager I hereby state that this Technical Information Report for the Federal Way Public Schools Memorial Stadium project has been prepared by me or under my supervision and meets the standard of care and expertise that is usual and customary in this community for professional engineers. I understand that the City of Federal Way does not and will not assume liability for the sufficiency, suitability, or performance of drainage 4.29.2022 Federal Way Public Schools Memorial Stadium Preliminary Technical Information Report Project No: 21049 Table of Contents Section Page Section 1 – Project Overview ........................................................................................................................ 1 Purpose and Scope .................................................................................................................................... 2 Pre-Development Conditions .................................................................................................................... 2 Post-Development Conditions .................................................................................................................. 3 Drainage Basins ......................................................................................................................................... 3 Section 1 – Figures .................................................................................................................................... 5 1-1 TIR Worksheet................................................................................................................................. 5 1-2 Site Location Map ........................................................................................................................... 5 1-3 Drainage Basins, Subbasins, and Site Characteristics Map – Pre-Developed ................................. 5 1-4 Drainage Basins, Subbasins, and Site Characteristics Map – Post-Developed ............................... 5 1-5 Bond Quantities Worksheet (not included) .................................................................................... 5 Section 2 – Conditions and Requirements Summary ................................................................................... 6 CR 1 – Discharge at the Natural Location ................................................................................................. 7 CR 2 – Offsite Analysis ............................................................................................................................... 7 CR 3 – Flow Control Facilities .................................................................................................................... 7 CR 4 – Conveyance System ....................................................................................................................... 8 CR 5 – Construction Stormwater Pollution Prevention ............................................................................ 8 CR 6 – Maintenance and Operation .......................................................................................................... 8 CR 7 – Financial Guarantees and Liability ................................................................................................. 8 CR 8 – Water Quality Facilities .................................................................................................................. 8 CR 9 – Flow Control BMPs ......................................................................................................................... 8 SR 1 – Other Adopted Area-Specific Requirements .................................................................................. 9 SR 2 – Floodplain/Floodway Delineation .................................................................................................. 9 SR 3 – Flood Protection Facilities .............................................................................................................. 9 SR 4 – Source Controls .............................................................................................................................. 9 SR 5 – Oil Control ...................................................................................................................................... 9 Section 2 – Figures .................................................................................................................................. 11 2-1 FEMA Flood Insurance Rate Map .................................................................................................. 11 Section 3 – Offsite Analysis ......................................................................................................................... 12 Downstream Analysis .............................................................................................................................. 13 Task 1 – Study Area Definition and Maps ........................................................................................... 13 Task 2 – Resource Review ................................................................................................................... 13 Federal Way Public Schools Memorial Stadium Preliminary Technical Information Report Project No: 21049 Task 3 – Field Inspection ..................................................................................................................... 13 Task 4 – Drainage System Description and Problem Descriptions ..................................................... 13 Task 5 – Mitigation of Existing or Potential Problems ........................................................................ 14 Section 3 – Figures .................................................................................................................................. 15 3-1 Site Map ........................................................................................................................................ 15 Section 4 – Flow Control, Low Impact Development (LID) and Water Quality Facilities Analysis and Design .................................................................................................................................................................... 16 Existing Site Hydrology ............................................................................................................................ 17 Developed Site Hydrology ....................................................................................................................... 17 Performance Standards .......................................................................................................................... 17 Flow Control System ............................................................................................................................... 18 Existing Pond and High School Site ..................................................................................................... 18 Project Site .......................................................................................................................................... 18 Flow Control Modeling........................................................................................................................ 19 Water Quality System ............................................................................................................................. 19 Low Impact Development (LID) .............................................................................................................. 20 Section 4 – Figures .................................................................................................................................. 21 4-1 Targeted Areas For Flow Control Map .......................................................................................... 21 4-2 Swapped Areas For Flow Control Map ......................................................................................... 21 4-3 Flow Control Calculations – Level 2 .............................................................................................. 21 4-4 Flow Control Calculations – Level 3 .............................................................................................. 21 4-5 Water Quality Basin Map .............................................................................................................. 21 4-6 Water Quality Calculations ........................................................................................................... 21 4-7 Targeted Areas For Flow Control BMPs Map ................................................................................ 21 4-8 Swapped Areas For Flow Control BMPs Map ............................................................................... 21 4-9 Flow Control BMPs Calculations ................................................................................................... 21 4-10 Federal Way High School TIR ...................................................................................................... 21 Section 5 – Conveyance System Analysis and Design ................................................................................. 22 Section 6 – Special Reports and Studies ..................................................................................................... 24 Section 6 – Figures .................................................................................................................................. 26 6-1 Geotechical Engineering Report ................................................................................................... 26 Section 7 – Other Permits ........................................................................................................................... 27 Section 8 – CSWPPP Analysis and Design ................................................................................................... 29 Section 9 – Bond Quantities, Facilities Summaries, and Declarations of Covenant ................................... 31 Section 10 – Operations and Maintenance Plan......................................................................................... 33 Federal Way Public Schools Memorial Stadium Preliminary Technical Information Report Project No: 21049 Section 11 - Conclusion ............................................................................................................................... 35 Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 Section 1 – Project Overview Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 Purpose and Scope The purpose and scope of the Preliminary Technical Information Report (TIR) is to describe the methodology and design criteria related to the storm design for the Federal Way Public Schools Memorial Field project. This report accompanies the civil engineering plans and documents for the subject project, located at 1300 South 308th Street, Federal Way, Washington. The project site is approximately 7.92 acres in size and occupies King County Parcel 0821049001, which is approximately 38.46 acres in size. See Figure 1-1 for the King County TIR Worksheet, and Figure 1-2 for a Site Location Map of the project. The 2021 King County Surface Water Design Manual, hereinafter referred to as 2021 KCSWDM, establishes the methodology and design criteria used for the conveyance and flow control facilities. The City of Federal Way also has an addendum to the 2021 KCSWDM, which is included as part of the analysis. The project proposes to upgrade the existing stadium with new grandstands, replaced track and field surfacing, paved parking, and new locker rooms and restrooms. Americans with Disabilities Act (ADA) routes are proposed throughout, providing access to the parking lot and existing high school. No offsite improvements are proposed. Stormwater runoff is collected across the site using various methods, including catch basins, roof downspouts, trench drains, french drains, and field underdrains. A portion of the runoff is conveyed to the existing stormwater detention pond located along the western property boundary, while other areas continue to discharge directly to the City of Federal Way storm network. Areas that cannot be captured and directed to the detention pond are swapped for an equivalent area that would otherwise not count as a targeted area. The total new and replaced impervious surfaces completed as part of this project are approximately 134,908 square feet (3.09 acres). Pre-Development Conditions In the pre-developed condition, the parcel is developed with the Federal Way High School campus and Memorial Field. Included in the development are the high school campus, grandstands, multiple parking lots, athletic fields, pedestrian access routes, and a stormwater detention pond. The parcel is bordered to the north by South 304th Street, to the east by Pacific Highway South, to the south by South 308th Street, and to the west by single-family residences. In 2014, the high school was replaced, which included new buildings, parking lots, tennis courts, and athletic fields. Because of this, a stormwater detention pond and various bioretention facilities were constructed to mitigate stormwater runoff in accordance with the 2009 King County Surface Water Design Manual, hereinafter referred to as the 2009 KCSWDM. Stormwater from Memorial Field, southwest gravel parking lot, and kitchen/locker room buildings bypass the detention facility and enter the City of Federal Way storm system in South 308th Street. The project site only includes areas that were not part of the high school replacement project. Within the project site, there is a total elevation change of approximately 27 feet. In general, the site slopes down from east towards the western property line. A majority of the site is on a single plane, except for the east grandstand, which contains approximately 20 feet of elevation gain and connects to the high school portion of the parcel and 14th Avenue South. As mentioned, the project site contains its own existing stormwater conveyance system that is independent of the high school system. Both systems discharge to the City system at a similar location Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 near the southwest corner of the parcel in South 308th Street. See Figure 1-3 for the Drainage Basins, Subbasins and Site Characteristics Map. A Geotechnical Engineering Report was prepared by Associated Earth Sciences, Inc. dated February 8, 2021. The investigation determined that the site was underlain by a combination of fill and pre-Fraser deposits. The fill was characterized as being native to the site, presumably from past projects. The pre- Fraser deposits consisted of medium dense to very dense silty, fine to medium sand with gravel. Both soil types are considered moisture sensitive and not suitable for infiltration. The complete Geotechnical Engineering Report is included as Figure 6-1. Post-Development Conditions In the post-developed condition, the project site consists of a renovated stadium with new grandstands, replaced synthetic turf field and track surface, new locker rooms and restrooms, and a paved parking lot. Because the track and field improvements are only surfacing replacements, they are considered maintenance and not considered a target area for stormwater management. The grandstands, restrooms, locker rooms, plaza areas, and parking lot are all considered replaced impervious surface, and are targeted for mitigation in accordance with the 2021 KCSWDM. The existing detention pond serving the high school project was designed in accordance with the 2009 KCSWDM, using the King County Runoff Time Series (KCRTS). The improvements associated with this project are mitigated under the 2021 KCSWDM using currently approved modeling. Because this project uses the existing pond, pond modifications are required. The existing control structure is replaced and the detention pond is expanded, in order to meet current requirements. The project limits include approximately 345,032 square feet (7.92 acres), with a total of 134,908 square feet (3.09 acres) of new and replaced impervious surfaces. Drainage Basins In the pre-developed condition, the project site is considered one drainage basin, with two subbasins. In one subbasin, runoff enters an existing storm network through catch basins, roof downspouts, and field underdrains, and exits the site in South 308th Street near the southwest corner of the parcel. This subbasin includes the existing track and field, grandstands, restrooms, and plaza areas, and is referred to in this report as Subbasin 1. Subbasin 2 includes the existing gravel parking lot, which sheet flows to the bioretention facility on the south side of the lot. This subbasin also discharges to the City system at the southwest corner of the parcel. The remaining high school site area is conveyed to an existing detention pond, where it is released in a similar location. In the pre-developed condition, Subbasin 1 is approximately 6.52 acres in size, while Subbasin 2 is approximately 1.40 acres in size. The pre-developed subbasins are summarized in Table 1, below. Refer to Figure 1-3 for the existing discharge points. Table 1. Pre-developed Subbasins Impervious (ac) Pervious (ac) Total (ac) Subbasin 1 5.22 1.30 6.52 Subbasin 2 1.32 0.08 1.40 Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 Total 6.54 1.38 7.92 In the post-developed condition, the project site is considered one drainage basin, with three subbasins. Subbasin 1 includes the northern half of the resurfaced track and field underdrains, the northern half of the west (visitor) grandstands, and landscaped area. This subbasin is collected and conveyed to the existing detention pond and is approximately 2.96 acres in size. This subbasin also contains a bioretention facility that treats surface runoff for Core Requirement 9 – Flow Control BMPs. Subbasin 2 includes the paved parking lot, which continues to sheet flow to the southern bioretention facility. This subbasin is approximately 1.40 acres in size. Subbasin 3 includes the southern half of the west (visitor) grandstands, the southern half of the resurfaced track and field, the east (home) grandstand, restrooms and locker rooms, and replaced plaza areas. This subbasin is approximately 3.56 acres in size and utilizes the existing storm network to leave the site. This subbasin bypasses detention and treatment. The post- developed subbasins are summarized in Table 2, below. Subbasin delineation for the post-developed condition is included in Figure 1-4. Table 2. Post-developed Subbasins Impervious (ac) Pervious (ac) Total (ac) Subbasin 1 2.03 0.93 2.96 Subbasin 2 1.32 0.08 1.40 Subbasin 3 3.03 0.53 3.56 Total 6.38 1.54 7.92 Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 Section 1 – Figures 1-1 TIR WORKSHEET 1-2 SITE LOCATION MAP 1-3 DRAINAGE BASINS, SUBBASINS, AND SITE CHARACTERISTICS MAP – PRE-DEVELOPED 1-4 DRAINAGE BASINS, SUBBASINS, AND SITE CHARACTERISTICS MAP – POST-DEVELOPED 1-5 BOND QUANTITIES WORKSHEET (NOT INCLUDED) KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 1 PROJECT OWNER AND PROJECT ENGINEER Project Owner Phone _____ Address Project Engineer Company ____ Phone _______ Part 2 PROJECT LOCATION AND DESCRIPTION Project Name _ DLS-Permitting Permit #_____ Location Township Range _ Section _ Site Address _______ Part 3 TYPE OF PERMIT APPLICATION □ Land use (e.g.,Subdivision / Short Subd. / UPD) □ Building (e.g.,M/F / Commercial / SFR) □ Clearing and Grading □ Right-of-Way Use □ Other ___________________________ Part 4 OTHER REVIEWS AND PERMITS1 □ DFW HPA □ COE CWA 404 □ ECY Dam Safety □ FEMA Floodplain □ COE Wetlands □ Other _________ □ Shoreline Management □ Structural Rockery/Vault/______ □ ESA Section 7 Part 5 PLAN AND REPORT INFORMATION Technical Information Report Type of Drainage Review (check one): Date (include revision dates): Date of Final: □ □ □ □ □ Full Targeted Simplified Large Project Directed Site Improvement Plan (Engr. Plans) Plan Type (check one): Date (include revision dates): Date of Final: □ Full □ Modified □ Simplified Part 6 SWDM ADJUSTMENT APPROVALS Type (circle one): Standard / Experimental /Blanket Description: (include conditions in TIR Section 2) Approved Adjustment No._ _ Date of Approval: __________________________ 1 DFW: WA State Dept. of Fish and Wildlife. HPA: hydraulic project approval. COE: (Army) Corps of Engineers. CWA: Clean Water Act. ECY: WA State Dept. of Ecology. FEMA: Federal Emergency Management Agency. ESA: Endangered Species Act. 2021 Surface Water Design Manual 1 Last revised 7/23/2021 FEDERAL WAY PUBLIC SCHOOLS 203.462.9144 33330 8th Avenue South Federal Way, WA 90883 Lucas Johnson, PE Ethos Civil 253.365.4973 FWPS Memorial Field 21N 4E 8 1300 S 308th Street, Federal Way, WA 98003 X X 05/03/2022 X 05/03/2022 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 7 MONITORING REQUIREMENTS Monitoring Required: Yes / No Start Date: Describe: Completion Date:Re: KCSWDM Adjustment No. Part 8 SITE COMMUNITY AND DRAINAGE BASIN Community Plan :________________________________ Special District Overlays:_________________________ Drainage Basin:__________________________________ Stormwater Requirements: _______________________ Part 9 ONSITE AND ADJACENT SENSITIVE AREAS □ River/Stream □Steep Slope □ Lake □Erosion Hazard □ Wetlands □Landslide Hazard □ Closed Depression □Coal Mine Hazard □ Floodplain □Seismic Hazard □ Other □Habitat Protection □ Part 10 SOILS Soil Type Slopes Erosion Potential □ High Groundwater Table (within 5 feet) □ Sole Source Aquifer □ Other ______________ _______________________ □ Seeps/Springs □ Additional Sheets Attached 2021 Surface Water Design Manual 2 Last revised 7/23/2021 City of Federal Way Lower Puget Sound Basin All Core Requirements Arents, Alderwood 0 to 6%Moderate KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 11 DRAINAGE DESIGN LIMITATIONS REFERENCE LIMITATION / SITE CONSTRAINT □ Core 2 - Offsite Analysis____________________ _________________________________ □ Sensitive/Critical Areas _____________________ _________________________________ □ SEPA _____________________________________ _________________________________ □ LID Infeasibility____________________________ _________________________________ □ Other_____________________________________ _________________________________ □ □ Additional Sheets Attached Part 12 TIR SUMMARY SHEET (provide one TIR Summary Sheet per Threshold Discharge Area) Threshold Discharge Area: (name or description) Core Requirements (all 8 apply): Discharge at Natural Location Number of Natural Discharge Locations: Offsite Analysis Level: 1 / 2 / 3 dated: Flow Control (include facility Level: 1 / 2 / 3 or Exemption Number ______________ summary sheet)Flow Control BMPs Conveyance System Spill containment located at: Erosion and Sediment Control /CSWPP/CESCL/ESC Site Supervisor: Construction Stormwater Pollution Prevention Contact Phone: After Hours Phone: Maintenance and Operation Responsibility (circle one): Private / Public If Private, Maintenance Log Required: Yes / No Financial Guarantees and Liability Provided: Yes / No Water Quality (include facility Type (circle one): Basic / Sens. Lake / Enhanced Basic / Bog summary sheet)or Exemption No. Landscape Management Plan: Yes / No For Entire Project:Total Replaced Impervious surfaces on the site % of Target Impervious that had a feasible FCBMP Total New Pervious Surfaces on the site Repl. Imp. on site mitigated w/flow control facility implemented Repl. Imp. on site mitigated w/water quality facility Repl. Imp. on site mitigated with FCBMP 2021 Surface Water Design Manual 3 Last revised 7/23/2021 X 2 03/28/2022 Bioretention TBD TBD TBD 100% 3.09 AC 0.16 AC 3.09 AC 1.32 AC 1.69 AC KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 12 TIR SUMMARY SHEET (provide one TIR Summary Sheet per Threshold Discharge Area) Special Requirements (as applicable): Area Specific Drainage Requirements Type: CDA / SDO / MDP / BP / LMP / Shared Fac. / None Name: Floodplain/Floodway Delineation Type (circle one): Major / Minor / Exemption / None 100-year Base Flood Elevation (or range): Datum: Flood Protection Facilities Describe: Source Control (commercial / industrial land use) Describe land use: Describe any structural controls: Oil Control High-use Site: Yes / No Treatment BMP: Maintenance Agreement: Yes / No with whom? Other Drainage Structures Describe: Part 13 EROSION AND SEDIMENT CONTROL REQUIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION ^ Clearing Limits ^ Cover Measures ^ Perimeter Protection ^ Traffic Area Stabilization ^ Sediment Retention ^ Surface Water Collection ^ Dewatering Control ^ Dust Control ^ Flow Control ^ Protection of Flow Control BMP Facilities (existing and proposed) ^ Maintain BMPs / Manage Project MINIMUM ESC REQUIREMENTS AFTER CONSTRUCTION ^ Stabilize exposed surfaces ^ Remove and restore Temporary ESC Facilities ^ Clean and remove all silt and debris, ensure operation of Permanent Facilities, restore operation of Flow Control BMP Facilities as necessary ^ Flag limits of SAO and open space preservation areas ^ Other 2021 Surface Water Design Manual 4 Last revised 7/23/2021 X X X X X X X X X X X X KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 14 STORMWATER FACILITY DESCRIPTIONS (Note: Include Facility Summary and Sketch) Flow Control Type/Description Water Quality Type/Description □ Detention □Vegetated Flowpath □ Infiltration □Wetpool □ Regional Facility □Filtration □ Shared Facility □Oil Control □ Flow Control BMPs □Spill Control □ Other □Flow Control BMPs □Other Part 15 EASEMENTS/TRACTS Part 16 STRUCTURAL ANALYSIS □ Drainage Easement □ Cast in Place Vault □ Covenant □ Retaining Wall □ Native Growth Protection Covenant □ Rockery > 4’ High □ Tract □ Structural on Steep Slope □ Other □ Other Part 17 SIGNATURE OF PROFESSIONAL ENGINEER I, or a civil engineer under my supervision, have visited the site. Actual site conditions as observed were incorporated into this worksheet and the attached Technical Information Report. To the best of my knowledge the information provided here is accurate. Signed/Date 2021 Surface Water Design Manual 5 Last revised 7/23/2021 X X Detention Pond Bioretention X Bioretention 1G0002304005402030G13200405004020301G10GCCCCCCCCCCCCCCCCCCSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGNO PARKING VAN FWPS MEMORIAL STADIUM SUBBASIN 2 (WATER QUALITY) IMPERVIOUS: 1.32 AC PERVIOUS: 0.08 AC PROJECT LIMITS EXISTING BIORETENTION FACILITY PROJECT SITE SITE LOCATION MAP 1-2 NO PARKING NO PARKING NO PARKING NO P A R KI N G NO PARKING NO PARKINGNO PARKINGNO PARKINGNO PARKINGNO PARKINGNO PARKINGNO PARKINGNO P A R K I N G FWPS MEMORIAL STADIUM SUBBASIN 1 IMPERVIOUS: 5.22 AC PERVIOUS: 1.30 AC SUBBASIN 2 IMPERVIOUS: 1.32 AC PERVIOUS: 0.08 AC SUBBASIN 1 DISCHARGE LOCATION SUBBASIN 2 DISCHARGE LOCATION EXISTING DETENTION POND PROJECT LIMITS DRAINAGE BASINS, SUBBASINS, AND SITE CHARACTERISTICS MAP - PRE-DEVELOPED 1-3 1G0002304005402030G13200405004020301G10GCCCCCCCCCCCCCCCCCCSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGNO PARKING VAN FWPS MEMORIAL STADIUM SUBBASIN 1 IMPERVIOUS: 2.03 AC PERVIOUS: 0.93 AC PROJECT LIMITS NEW BIORETENTION FACILITY DRAINAGE BASINS, SUBBASINS, AND SITE CHARACTERISTICS MAP - POST-DEVELOPED 1-4 SUBBASIN 2 IMPERVIOUS: 1.32 AC PERVIOUS: 0.08 AC SUBBASIN 3 IMPERVIOUS: 3.03 AC PERVIOUS: 0.53 AC Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 Section 2 – Conditions and Requirements Summary Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 CR 1 – Discharge at the Natural Location All stormwater runoff and surface water from a project must be discharged at the natural location so as not to be diverted onto or away from downstream properties. The manner in which stormwater runoff and surface water are discharged from the project site must not create a significant adverse impact to downhill properties or drainage facilities. The proposed project utilizes existing discharge locations and will not adversely impact downhill properties. CR 2 – Offsite Analysis All proposed projects must submit an offsite analysis report that assesses potential offsite drainage and water quality impacts associated with development of the project site, and that proposes appropriate mitigation of those impacts. A Level 1 downstream analysis was performed by Springline Design LLC as part of the Federal Way High School project in 2013. This analysis was reviewed and confirmed by Ethos Civil. The proposed improvements will not create or aggravate deficiencies with regard to the downstream drainage system. CR 3 – Flow Control Facilities All proposed projects, including redevelopment projects, must provide onsite flow control facilities to mitigate the impacts of storm and surface water runoff generated by new impervious surface, new pervious surface, and replaced impervious surface targeted for flow control mitigation as specified in the 2021 KCSWDM. Per the City of Federal Way Flow Control Applications Map, the project is required to provide Level 3 Flow Control (Flood Problem Flow Control) for all new and replaced impervious surfaces. The Level 3 Flow Control requirements include Level 2 requirements, and are summarized below: Level 2 Flow Control: Match developed discharge durations to predeveloped durations for the range of predeveloped discharge rates from 50% of the 2-year peak flow up to the full 50-year peak flow. Also match developed peak discharge rates to predeveloped peak discharge rates for the 2- and 10-year return periods. Level 3 Flow Control: Match the developed 100-year peak discharge rate to the predeveloped 100-year peak discharge rate. If the Flood Problem Flow Control Area is located within a Conservation Flow Control Area and does not drain entirely by non-erodible manmade conveyance to a major receiving body, then historic site conditions shall be assumed as the predeveloped condition except for the purposes of matching 100-year peak discharge rates. For the purposes of matching 100-year peak discharge rates, existing site conditions may be assumed. The proposed project expands the existing detention pond and replaces the existing flow control structure in order to meet the requirements of Core Requirement 3 – Flow Control. The entire parcel (including the Federal Way High School facilities) is included in the modeling to ensure compliance with the 2021 KCSWDM for the entire parcel. Based on site grades and existing flow characteristics, portions of the targeted areas infeasible to reasonably convey to the detention pond. Because of this, equivalent areas that are beyond the targeted areas of the project are swapped for flow control. Further discussion on the flow control mitigation is located in Section 4.0 below. Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 CR 4 – Conveyance System All engineered conveyance system elements for proposed projects must be analyzed, designed, and constructed to provide a minimum level of protection against overtopping, flooding, erosion, and structural failure as specified in the 2021 KCSWDM. All pipes and channels are sized to contain the 25- year peak flow with sufficient capacity, and as much of the 100-year peak flow as necessary to prevent severe flooding problems. Further discussion on the conveyance analysis is located in Section 5.0 below. CR 5 – Construction Stormwater Pollution Prevention All proposed projects that will clear, grade, or otherwise disturb the site must provide erosion and sediment controls to prevent, to the maximum extent practicable, the transport of sediment from the project site to downstream drainage facilities, water resources, and adjacent properties. All proposed projects that will conduct construction activities onsite or offsite must provide stormwater pollution prevention and spill controls to prevent, reduce or eliminate the discharge of pollutants to onsite or adjacent stormwater systems or watercourses. To prevent sediment transport and pollutant discharges, as well as other impacts related to land-disturbing and construction activities, Erosion and Sediment Control (ESC) measures and Stormwater Pollution Prevention and Spill Control (SWPPS) measures that are appropriate to the project site are applied through a comprehensive Construction Stormwater Pollution Prevention Plan (CSWPPP). Further discussion on the CSWPPP is located in Section 8.0. CR 6 – Maintenance and Operation Maintenance and operation of all drainage facilities are the responsibility of the applicant or property owner, except those facilities for which the City of Federal Way assumes maintenance and operations, as described in the 2021 KCSWDM. Drainage facilities must be maintained and operated in accordance with the maintenance standards in Appendix A of the 2021 KCSWDM. Further discussion on the maintenance and operations associated with the proposed drainage facilities is located in Section 10.0 below. CR 7 – Financial Guarantees and Liability All drainage facilities constructed or modified for projects must comply with the financial guarantee requirements in the City of Federal Way. The owner and contractor will obtain all necessary permits required by the City of Federal Way prior to beginning of construction. The owner will fulfill all financial requirements associated with this project. Further discussion is located in Section 9.0 below. CR 8 – Water Quality Facilities All proposed projects, including redevelopment projects, must provide water quality facilities to treat the runoff from those new and replaced pollution-generating impervious surfaces and new pollution- generating pervious surfaces targeted for treatment as specified in the 2021 KCSWDM. The proposed project is required to provide Enhanced Basic treatment for all pollution-generating impervious surface (PGIS) runoff. In order to meet this requirement, the project utilizes the existing bioretention facility located south of the parking lot to treat PGIS runoff. Further discussion, including design methodology, is located in Section 4.5 below. CR 9 – Flow Control BMPs All proposed projects, including redevelopment projects, must provide onsite flow control Best Management Practices (BMPs) to mitigate the impacts of storm and surface water runoff generated by Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 new impervious surface, new pervious surface, existing impervious surfaces, and replaced impervious surfaces targeted for mitigation, as specified in the 2021 KCSWDM. There are two methods of satisfying the Flow Control BMP requirement: (1) application of BMPs to the maximum extent feasible using lists specific to the project location, size, and impervious coverage; or (2) using a continuous runoff model to demonstrate compliance with the Low Impact Development (LID) Performance Standard. In order to meet the LID Performance Standard, stormwater discharges shall match developed discharge durations to pre-developed durations for the range of pre-developed discharge rates from 8% of the 2-year peak flow to 50% of the 2-year peak flow, assuming historic site conditions as the predeveloped condition. The project meets the Flow Control BMP requirement by conveying an area equivalent to the targeted area to a bioretention facility, sized in accordance with the 2021 KCSWDM. Further discussion is located in Section 4.0 below. SR 1 – Other Adopted Area-Specific Requirements Besides the 2021 KCSWDM, there are other regulations that may apply requirements for controlling drainage on an area-specific basis. Examples of these regulations include: Critical Drainage Areas (CDAs), Master Drainage Plans (MDPs), Basin Plans (BPs), Salmon Conservation Plans (SCPs), Stormwater Compliance Plans (SWCPs), Lake Management Plans (LMPs), Flood Hazard Management Plans (FHMPs), and Shared Facility Drainage Plans (SFDPs). No known area-specific requirements are associated with this site. SR 2 – Floodplain/Floodway Delineation Flood hazard areas are composed of the 100-year floodplain, zero-rise flood fringe, zero-rise floodway, FEMA floodway, and channel migration zones. If a proposed project contains or is adjacent to a flood hazard area, as determined by DPER, this special requirement requires the project to determine those components that are applicable and delineate them on the project’s site improvement plans and recorded maps. The project site is not located in or directly adjacent to a flood hazard area. A FEMA Flood Insurance Rate Map is included in Figure 2-1. SR 3 – Flood Protection Facilities Flood protection facilities, such as levees and revetments, require a high level of confidence in their structural integrity and performance. Proper analysis, design, and construction are necessary to protect against the potentially catastrophic consequences if such facilities should fail. The project will not rely on an existing flood protection facility for protection against hazards posed by erosion or inundation, or modify or construct a new flood protection facility. SR 4 – Source Controls Water quality source controls prevent rainfall and runoff water from coming into contact with pollutants, thereby reducing the likelihood that pollutants will enter public waterways and violate water quality standards or City stormwater discharge permit limits. All applicable structural source control measures are implemented on the project site, as described in the 2021 KCSWDM. SR 5 – Oil Control Projects proposing to develop or redevelop a high-use site must provide oil controls, in addition to any other water quality controls required by the 2021 KCSWDM. Such sites typically generate high concentrations of oil due to high traffic turnover, onsite vehicle or heavy or stationary equipment use, Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 some business operations, e.g., automotive recycling, or the frequent transfer of liquid petroleum or coal derivative products. The proposed project is not classified as a high-use site and is not making improvements to an existing high-use site. Therefore, oil control treatment is not required for this project. Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 Section 2 – Figures 2-1 FEMA FLOOD INSURANCE RATE MAP 2215 North 30th Street Suite 300 Tacoma, WA 98403 253.383.2422 TEL 253.383.2572 FAX 2215 North 30th Street Suite 300 Tacoma, WA 98403 253.383.2422 TEL 253.383.2572 FAX 2215 North 30th Street Suite 300 Tacoma, WA 98403 253.383.2422 TEL 253.383.2572 FAX FWPS MEMORIAL STADIUM FEMA FLOOD INSURANCE RATE MAP 2-1 PROJECT SITE Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 Section 3 – Offsite Analysis Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 Downstream Analysis TASK 1 – STUDY AREA DEFINITION AND MAPS Task 1 of the offsite analysis involves mapping and defining the stormwater characteristics around the subject property one mile downstream, and as far upstream as necessary to encompass the offsite drainage tributary to the site. According to Federal Way GIS maps, the project is in the Lower Puget Sound Drainage Basin. Topographical information was obtained from the site survey, King County iMap resource, and GIS maps from the City of Federal Way. See Figure 3-1 for a Site Map describing the downstream flowpath of the parcel. TASK 2 – RESOURCE REVIEW Task 2 of the offsite analysis involves reviewing available references and records that describe the site’s flow path and potential flooding, erosion, and water quality problems. The following references were used to complete the offsite analysis: · 2021 KCSWDM · King County iMap Resource · City of Federal Way GIS maps · FEMA Flood Maps · King County Soils Survey · Federal Way High School TIR TASK 3 – FIELD INSPECTION Task 3 of the offsite analysis involves an inspection of the existing onsite and offsite drainage system. The existing storm network was observed for deficiencies and drainage problems. A Level 1 downstream analysis was performed in September 2013, by Springline LLC, and was confirmed on March 28, 2022 by Ethos Civil. Runoff from the site discharges through a closed-pipe network to the City of Federal Way system in south 308th Street. Runoff is conveyed west through the City system in a 30-inch pipe. After reaching 10th Avenue South, the network conveys stormwater to the north through a 24-inch pipe, which is approximately 530 feet downstream of the parcel. After travelling north approximately 600 feet, the system outfalls into a gulch and creek. The creek generally travels in the northwest direction for approximately 1,140 feet, until reaching South Dash Point Road. After crossing South Dash Point Road, the creek continues to head northwest to the Puget Sound, over one mile downstream. Upstream of the project site is the Federal Way High School. This portion of the parcel is currently developed and therefore contains stormwater facilities that capture a majority of the runoff. Frontage improvements along South 308th Street capture offsite stormwater that could otherwise flow onto the project site. Because of this, the potential for upstream runoff is minimal and does not contribute to the project site. TASK 4 – DRAINAGE SYSTEM DESCRIPTION AND PROBLEM DESCRIPTIONS As described above, the existing onsite drainage system consists of a closed-pipe system that conveys runoff toward the southwest corner of the parcel. The project site contributes to the City storm system, Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 which conveys runoff to a creek located west of the parcel. The only known downstream problem is with a portion of the City conveyance system, which is beyond one mile downstream of the site. TASK 5 – MITIGATION OF EXISTING OR POTENTIAL PROBLEMS The proposed improvements will reduce the rates that runoff will leave the site. Based on this and the condition of the existing downstream system, no negative impacts to the City storm system are anticipated. The proposed project will not create a potential drainage or water quality problem. Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 Section 3 – Figures 3-1 SITE MAP 1G0002304005402030G13200405004020301G10GCCCCCCCCCCCCCCCCCCSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGNO PARKING VAN FWPS MEMORIAL STADIUM SUBBASIN 2 (WATER QUALITY) IMPERVIOUS: 1.32 AC PERVIOUS: 0.08 AC PROJECT LIMITS EXISTING BIORETENTION FACILITY 30" @ 0.5% 24" @ 1.6% 24" @ 1.6% CREEK CREEK 30" SITE DISCHARGE LOCATION SITE MAP 3-1 Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 Section 4 – Flow Control, Low Impact Development (LID) and Water Quality Facilities Analysis and Design Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 Existing Site Hydrology Within the project site, there is a total elevation change of approximately 27 feet. In general, the site slopes down from east towards the western property line. A majority of the site is on a single plane, except for the east grandstand, which contains approximately 20 feet of elevation gain and connects to the high school portion of the parcel and 14th Avenue South. Stormwater runoff is collected across the site using various methods, including catch basins, roof downspouts, trench drains, french drains, and field underdrains. A portion of the runoff is conveyed to the existing stormwater detention pond located along the western property boundary, while other areas continue to discharge directly to the City of Federal Way storm network. Areas that cannot be captured and directed to the detention pond are swapped for an equivalent area that would otherwise not count as a targeted area. A Geotechnical Engineering Report was prepared by Associated Earth Sciences, Inc. dated February 8, 2021. The investigation determined that the site was underlain by a combination of fill and pre-Fraser deposits. The fill was characterized as being native to the site, presumably from past projects. The pre- Fraser deposits consisted of medium dense to very dense silty, fine to medium sand with gravel. Both soil types are considered moisture sensitive. The complete Geotechnical Engineering Report is included as Figure 6-1. Developed Site Hydrology In the post-developed condition, the project site consists of a renovated stadium with new grandstands, replaced synthetic turf field and track surface, new locker rooms and restrooms, and a paved parking lot. Because the track and field improvements are only surfacing replacements, they are considered maintenance and not considered a target area for stormwater management. The grandstands, restrooms, locker rooms, plaza areas, and parking lot are all considered replaced impervious surface, and are targeted for mitigation in accordance with the 2021 KCSWDM. The project site includes approximately 345,032 square feet (7.92 acres), with a total of 134,908 square feet (3.09 acres) of new and replaced impervious surfaces. The project site is considered one drainage basin, with three subbasins. Subbasin 1 includes the northern half of the resurfaced track and field underdrains, the northern half of the west (visitor) grandstands, and landscaped area. This subbasin is collected and conveyed to the existing detention pond and is approximately 2.96 acres in size. This subbasin also contains a bioretention facility that treats surface runoff for Core Requirement 9 – Flow Control BMPs. Subbasin 2 includes the paved parking lot, which continues to sheet flow to the southern bioretention facility. This subbasin is approximately 1.40 acres in size. Subbasin 3 includes the southern half of the west (visitor) grandstands, the southern half of the resurfaced track and field, the east (home) grandstand, restrooms and locker rooms, and replaced plaza areas. This subbasin is approximately 3.56 acres in size and utilizes the existing storm network to leave the site. This subbasin bypasses detention and treatment. Performance Standards Performance Standards describe the requirements that the project must adhere to regarding flow control, flow control BMPs, conveyance, and water quality. Per the City of Federal Way Flow Control Applications map, the project site is located in a Flood Problem Flow Control area. This requires a Level 3 flow control mitigation, as described above. Flow control is provided by the expansion of the existing detention pond, and replacement of the control structure. Based on existing grades and improvements, Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 areas equivalent to the target areas are swapped and conveyed to the detention pond. Flow Control BMPs are provided for the targeted areas through an equivalent area swap that is treated in a bioretention facility. The project is required to provide Enhanced Basic water treatment for new and replaced PGIS. This is met with the existing bioretention facility immediately south of the parking lot. For the purposes of this preliminary report, a conveyance analysis is not included. This will be included in the final report. No additional special requirements for source control or oil control are provided. Flow Control System EXISTING POND AND HIGH SCHOOL SITE For purposes of modeling the existing pond, surface values described in the Federal Way High School TIR (FWHS TIR) were used for the parcel area beyond the project site. The FWHS TIR is included as Figure 4- 10. These values are shown in Table 3 below. Based on existing improvements, grades, and storm systems, it is assumed that the limits of this project are approximately those shown in the FWHS TIR. Table 3. Federal Way High School Site Forested (ac) Grass (ac) Impervious (ac) Total (ac) Predeveloped 18.83 10.25* 0.00 29.08 Developed 0.00 16.82 12.26 29.08 *The FWHS TIR described approximately 10.25 acres of non-targeted landscaped areas that contribute runoff to the storm system. These areas were modeled as till grass in the pre-developed and post-developed condition. PROJECT SITE The project site consists of approximately 3.66 acres that are targeted for flow control. This includes approximately 3.09 acres of new or replaced impervious surface. In general, these areas include the paved parking lot, new grandstands, restrooms and locker rooms, plaza area, and landscaped area. See Figure 4-1 for a map showing the project areas targeted for flow control. Because these areas are conveyed through a bioretention facility, either to meet Core Requirement 8 – Water Quality Facilities or Core Requirement 9 – Flow Control BMPs, a surface credit of 90% is applied to the impervious surface area. The project site and adjusted site area required to meet the flow control standard are summarized in Table 4 below. Table 4. Project Site – Flow Control, Surface Credit Impervious (ac) Pervious (ac) Total (ac) Project Site 3.09 0.57 3.66 Project Site Adjusted 2.79 0.88 3.66 Based on the FWHS TIR, the detention pond was constructed with approximately 0.94 acre of additional impervious surface capacity for future projects. The recent CTE Courtyard project on the high school campus absorbed approximately 0.17 acre of that capacity, leaving approximately 0.77 acre. The project site and adjusted site area for flow control are shown in Table 5 below. Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 Table 5. Project Site – Flow Control, Pond Credit Impervious (ac) Pervious (ac) Total (ac) Project Site 2.79 0.88 3.66 Project Site Adjusted 2.02 0.88 2.90 The total adjusted area requiring flow control is approximately 2.90 acres, which includes approximately 2.02 acres of impervious surface. Based on existing site grades and improvements, it is not reasonably feasible to convey all of the project site to the detention pond. Instead, an equivalent area that is not currently targeted for flow control is swapped and conveyed to the detention pond. This area is described as Subbasin 1, in the post-developed condition above, and consists of the northern half of the resurfaced track and field underdrains, the northern half of the west (visitor) grandstands, and landscaped area. See Figure 4-2 for a map showing the swapped areas for flow control. A comparison of the area targeted for flow control and the swapped area is summarized in Table 6 below. Table 6. Project Site – Flow Control, Swapped Area Impervious (ac) Pervious (ac) Total (ac) Project Site Targeted 2.02 0.88 2.90 Project Site Swapped 2.03 0.93 2.96 Subbasin 2 and Subbasin 3 continue to leave the site undetained. FLOW CONTROL MODELING For the parcel, values from Table 3 and Table 5 provide the areas for modeling the high school site and project site for flow control. The Western Washington Hydrology Model (WWHM2012) was used to model the pre- and post-developed sites. For simplicity, the high school and project sites were separated into their own basins. In the pre-developed condition, the sites were modeled as forested for the Level 2 flow control requirement, with the exception of 10.25 acres of landscaped area described in Table 3. In the post-developed condition, appropriate surface coverages were used from Table 3 and Table 5. A detention pond with a similar live storage depth to the existing pond was sized. The model determined that an additional 36,000 cubic feet of storage is required for the project improvements, along with a new flow control structure. Complete Level 2 flow control calculations from WWHM2012 are included in Figure 4-3. It should be noted that Federal Way Public Schools is considering including a Thirsty Duck in the flow control structure in lieu of expanding the pond. For the Level 3 flow control requirement, the existing site was used as the pre-developed condition. This determined that the post-developed 100-year peak discharge rate does not exceed the pre-developed 100-year peak discharge rate. Complete Level 3 flow control calculations from WWHM2012 are included in Figure 4-4. Water Quality System Water quality systems are necessary to treat runoff generated from pollution-generating surfaces. The project’s use requires Enhanced Basic treatment, and proposes 57,668 square feet (1.32 acres) of PGIS. Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 This area includes the paved parking lot along South 308th Street, which contains a small area (approximately 0.08 acres) of landscaped islands that are tributary to the runoff. This area is identified as Subbasin 2 in the post-developed condition. The project utilizes the existing bioretention facility between the parking lot and South 308th Street for treatment. The existing facility has been analyzed using WWHM2012 for compliance with the 2021 KCSWDM. A Water Quality Basin Map is included as Figure 4-5. Complete water quality calculations are included in Figure 4-6. Low Impact Development (LID) The project is required to apply flow control BMPs as part of Core Requirement 9 – Flow Control BMPs, as feasible. Surfaces equivalent to the targeted areas are directed to a bioretention facility to meet this requirement. As described above, Subbasin 2 includes the parking lot that flows through the existing bioretention facility before leaving the site. The remaining targeted area that requires treatment is approximately 2.27 acres, which includes approximately 1.60 acres of impervious surface. A basin map showing the areas targeted for Core Requirement 9 is included as Figure 4-7. Based on site grades and existing improvements, it is not feasible to reasonably convey the remaining targeted areas to a bioretention facility. An equivalent area that is beyond the targeted areas is swapped in order to meet this requirement. This swapped area is within Subbasin 1 in the post- developed condition and includes approximately 2.39 acres. The swapped area includes the northern- half of the track and underdrained field, and landscaped areas. It should be noted that underdrained field is considered PGIS in the 2021 KCSWDM, and otherwise would not receive treatment without this area swap. A summary of the areas targeted for Core Requirement 9 and the swapped areas are included in Table 7 below. A basin map showing the swapped areas is included as Figure 4-8. Table 7. Project Site – Flow Control BMPs, Swapped Area Impervious (ac) Pervious (ac) Total (ac) Project Site Targeted 1.60 0.67 2.27 Project Site Swapped 1.69 0.70 2.39 WWHM2012 was used to determine the size of the bioretention facility. With 12 inches of ponding depth, the facility requires a bottom area of approximately 1,600 square feet. The facility is located northwest of the track and discharges, as part of Subbasin 1, to the detention pond. Complete WWHM2012 calculations are included in Figure 4-9. Subbasin 3 includes the remaining area that is not required to pass through flow control or a water quality facility. This subbasin includes areas that are within the project site but are not a targeted area. Included in Subbasin 3 are the southern-half of the track and field, southern-half of the west (visitor) grandstand, east (home) grandstand, lockers and restrooms, and plaza areas. Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 Section 4 – Figures 4-1 TARGETED AREAS FOR FLOW CONTROL MAP 4-2 SWAPPED AREAS FOR FLOW CONTROL MAP 4-3 FLOW CONTROL CALCULATIONS – LEVEL 2 4-4 FLOW CONTROL CALCULATIONS – LEVEL 3 4-5 WATER QUALITY BASIN MAP 4-6 WATER QUALITY CALCULATIONS 4-7 TARGETED AREAS FOR FLOW CONTROL BMPS MAP 4-8 SWAPPED AREAS FOR FLOW CONTROL BMPS MAP 4-9 FLOW CONTROL BMPS CALCULATIONS 4-10 FEDERAL WAY HIGH SCHOOL TIR 1G0002304005402030G13200405004020301G10GCCCCCCCCCCCCCCCCCCSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGNO PARKING VAN FWPS MEMORIAL STADIUM TARGETED AREA FOR FLOW CONTROL IMPERVIOUS: 2.02 AC PERVIOUS: 0.88 AC PROJECT LIMITS TARGETED AREAS FOR FLOW CONTROL MAP 4-1 1G0002304005402030G13200405004020301G10GCCCCCCCCCCCCCCCCCCSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGNO PARKING VAN FWPS MEMORIAL STADIUM SUBBASIN 1 (SWAPPED AREA FOR FLOW CONTROL) IMPERVIOUS: 2.03 AC PERVIOUS: 0.93 AC PROJECT LIMITS NEW BIORETENTION FACILITY SWAPPED AREAS FOR FLOW CONTROL MAP 4-2 WWHM2012 PROJECT REPORT 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:35:55 PM Page 2 General Model Information Project Name:FWHS_FC Site Name: Site Address: City: Report Date:4/27/2022 Gage:Seatac Data Start:1948/10/01 Data End:2009/09/30 Timestep:15 Minute Precip Scale:1.000 Version Date:2021/08/18 Version:4.2.18 POC Thresholds Low Flow Threshold for POC1:50 Percent of the 2 Year High Flow Threshold for POC1:50 Year 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:35:55 PM Page 3 Landuse Basin Data Predeveloped Land Use High School Bypass:No GroundWater:No Pervious Land Use acre C, Forest, Flat 18.83 C, Lawn, Flat 10.25 Pervious Total 29.08 Impervious Land Use acre Impervious Total 0 Basin Total 29.08 Element Flows To: Surface Interflow Groundwater 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:35:55 PM Page 4 Stadium Bypass:No GroundWater:No Pervious Land Use acre C, Forest, Flat 2.96 Pervious Total 2.96 Impervious Land Use acre Impervious Total 0 Basin Total 2.96 Element Flows To: Surface Interflow Groundwater 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:35:55 PM Page 5 Mitigated Land Use High School Bypass:No GroundWater:No Pervious Land Use acre C, Lawn, Flat 16.82 Pervious Total 16.82 Impervious Land Use acre PARKING FLAT 12.26 Impervious Total 12.26 Basin Total 29.08 Element Flows To: Surface Interflow Groundwater Trapezoidal Pond 1 Trapezoidal Pond 1 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:35:55 PM Page 6 Stadium Bypass:No GroundWater:No Pervious Land Use acre C, Lawn, Flat 0.93 Pervious Total 0.93 Impervious Land Use acre PARKING FLAT 2.03 Impervious Total 2.03 Basin Total 2.96 Element Flows To: Surface Interflow Groundwater Trapezoidal Pond 1 Trapezoidal Pond 1 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:35:55 PM Page 7 Routing Elements Predeveloped Routing 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:35:55 PM Page 8 Mitigated Routing Trapezoidal Pond 1 Bottom Length:295.00 ft. Bottom Width:95.00 ft. Depth:9 ft. Volume at riser head:7.1199 acre-feet. Side slope 1:3 To 1 Side slope 2:3 To 1 Side slope 3:3 To 1 Side slope 4:3 To 1 Discharge Structure Riser Height:8 ft. Riser Diameter:18 in. Orifice 1 Diameter:3.375 in.Elevation:0 ft. Orifice 2 Diameter:6.25 in.Elevation:6.75 ft. Orifice 3 Diameter:3.875 in.Elevation:7.5 ft. Element Flows To: Outlet 1 Outlet 2 Pond Hydraulic Table Stage(feet)Area(ac.)Volume(ac-ft.)Discharge(cfs)Infilt(cfs) 0.0000 0.643 0.000 0.000 0.000 0.1000 0.648 0.064 0.097 0.000 0.2000 0.654 0.129 0.138 0.000 0.3000 0.659 0.195 0.169 0.000 0.4000 0.665 0.261 0.195 0.000 0.5000 0.670 0.328 0.218 0.000 0.6000 0.675 0.395 0.239 0.000 0.7000 0.681 0.463 0.258 0.000 0.8000 0.686 0.532 0.276 0.000 0.9000 0.692 0.601 0.293 0.000 1.0000 0.697 0.670 0.309 0.000 1.1000 0.703 0.740 0.324 0.000 1.2000 0.709 0.811 0.338 0.000 1.3000 0.714 0.882 0.352 0.000 1.4000 0.720 0.954 0.365 0.000 1.5000 0.725 1.026 0.378 0.000 1.6000 0.731 1.099 0.391 0.000 1.7000 0.737 1.172 0.403 0.000 1.8000 0.742 1.246 0.414 0.000 1.9000 0.748 1.321 0.426 0.000 2.0000 0.754 1.396 0.437 0.000 2.1000 0.759 1.472 0.447 0.000 2.2000 0.765 1.548 0.458 0.000 2.3000 0.771 1.625 0.468 0.000 2.4000 0.777 1.702 0.478 0.000 2.5000 0.782 1.780 0.488 0.000 2.6000 0.788 1.859 0.498 0.000 2.7000 0.794 1.938 0.507 0.000 2.8000 0.800 2.018 0.517 0.000 2.9000 0.806 2.098 0.526 0.000 3.0000 0.812 2.179 0.535 0.000 3.1000 0.817 2.260 0.544 0.000 3.2000 0.823 2.342 0.552 0.000 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 NEW CONTROL STRUCTURE REQUIRED POND VOLUME FOR ENTIRE PARCEL. EXISTING POND PROVIDES 6.3 AC-FT ACCORDING TO FWHS TIR. THEREFORE AN ADDITIONAL 0.82 AC-FT IS NEEDED. PROVIDE AN ADDITIONAL 36,000 CUBIC FEET OF STORAGE. FWHS_FC 4/27/2022 12:35:55 PM Page 9 3.3000 0.829 2.425 0.561 0.000 3.4000 0.835 2.508 0.570 0.000 3.5000 0.841 2.592 0.578 0.000 3.6000 0.847 2.677 0.586 0.000 3.7000 0.853 2.762 0.594 0.000 3.8000 0.859 2.847 0.602 0.000 3.9000 0.865 2.934 0.610 0.000 4.0000 0.871 3.020 0.618 0.000 4.1000 0.877 3.108 0.625 0.000 4.2000 0.883 3.196 0.633 0.000 4.3000 0.889 3.285 0.641 0.000 4.4000 0.895 3.374 0.648 0.000 4.5000 0.901 3.464 0.655 0.000 4.6000 0.908 3.554 0.663 0.000 4.7000 0.914 3.645 0.670 0.000 4.8000 0.920 3.737 0.677 0.000 4.9000 0.926 3.829 0.684 0.000 5.0000 0.932 3.922 0.691 0.000 5.1000 0.938 4.016 0.698 0.000 5.2000 0.945 4.110 0.704 0.000 5.3000 0.951 4.205 0.711 0.000 5.4000 0.957 4.300 0.718 0.000 5.5000 0.963 4.396 0.724 0.000 5.6000 0.970 4.493 0.731 0.000 5.7000 0.976 4.590 0.738 0.000 5.8000 0.982 4.688 0.744 0.000 5.9000 0.989 4.787 0.750 0.000 6.0000 0.995 4.886 0.757 0.000 6.1000 1.001 4.986 0.763 0.000 6.2000 1.008 5.087 0.769 0.000 6.3000 1.014 5.188 0.775 0.000 6.4000 1.021 5.289 0.782 0.000 6.5000 1.027 5.392 0.788 0.000 6.6000 1.033 5.495 0.794 0.000 6.7000 1.040 5.599 0.800 0.000 6.8000 1.046 5.703 1.043 0.000 6.9000 1.053 5.808 1.222 0.000 7.0000 1.059 5.914 1.347 0.000 7.1000 1.066 6.020 1.450 0.000 7.2000 1.073 6.127 1.540 0.000 7.3000 1.079 6.235 1.621 0.000 7.4000 1.086 6.343 1.695 0.000 7.5000 1.092 6.452 1.764 0.000 7.6000 1.099 6.561 1.958 0.000 7.7000 1.106 6.672 2.073 0.000 7.8000 1.112 6.783 2.172 0.000 7.9000 1.119 6.894 2.263 0.000 8.0000 1.126 7.007 2.347 0.000 8.1000 1.132 7.119 2.929 0.000 8.2000 1.139 7.233 3.907 0.000 8.3000 1.146 7.347 5.076 0.000 8.4000 1.152 7.462 6.276 0.000 8.5000 1.159 7.578 7.350 0.000 8.6000 1.166 7.694 8.176 0.000 8.7000 1.173 7.811 8.730 0.000 8.8000 1.180 7.929 9.237 0.000 8.9000 1.186 8.047 9.681 0.000 9.0000 1.193 8.166 10.10 0.000 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:35:55 PM Page 10 9.1000 1.200 8.286 10.50 0.000 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:35:55 PM Page 11 Analysis Results POC 1 + Predeveloped x Mitigated Predeveloped Landuse Totals for POC #1 Total Pervious Area:32.04 Total Impervious Area:0 Mitigated Landuse Totals for POC #1 Total Pervious Area:17.75 Total Impervious Area:14.29 Flow Frequency Method:Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 1.332119 5 year 2.278647 10 year 3.016758 25 year 4.06907 50 year 4.936791 100 year 5.874307 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.710412 5 year 1.078599 10 year 1.391699 25 year 1.879976 50 year 2.320662 100 year 2.836141 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1949 2.232 0.557 1950 2.627 0.699 1951 2.229 2.019 1952 0.771 0.492 1953 0.611 0.579 1954 0.914 0.650 1955 1.413 0.665 1956 1.358 0.739 1957 1.514 0.641 1958 1.038 0.658 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:36:26 PM Page 12 1959 0.878 0.581 1960 1.948 1.534 1961 1.113 0.656 1962 0.565 0.467 1963 1.041 0.640 1964 1.340 0.600 1965 1.436 0.694 1966 0.728 0.586 1967 2.715 0.667 1968 1.347 0.591 1969 1.170 0.560 1970 1.004 0.579 1971 1.514 0.681 1972 2.103 0.791 1973 0.788 0.673 1974 1.273 0.669 1975 1.767 0.642 1976 1.186 0.664 1977 0.646 0.484 1978 0.843 0.655 1979 0.470 0.471 1980 2.948 1.684 1981 0.838 0.586 1982 2.577 0.789 1983 1.250 0.663 1984 0.736 0.536 1985 0.654 0.557 1986 1.803 0.755 1987 1.796 0.806 1988 0.674 0.549 1989 0.489 0.529 1990 5.907 1.535 1991 3.507 1.513 1992 1.076 0.669 1993 0.830 0.564 1994 0.385 0.449 1995 1.158 0.690 1996 3.139 2.124 1997 2.110 2.036 1998 1.015 0.560 1999 3.983 1.253 2000 1.074 0.674 2001 0.248 0.450 2002 1.735 0.777 2003 1.895 0.571 2004 2.565 1.872 2005 1.478 0.677 2006 1.540 0.665 2007 5.084 3.293 2008 3.980 2.188 2009 2.166 0.748 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 5.9071 3.2928 2 5.0839 2.1884 3 3.9831 2.1241 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:36:26 PM Page 13 4 3.9796 2.0364 5 3.5072 2.0193 6 3.1389 1.8718 7 2.9475 1.6838 8 2.7148 1.5349 9 2.6270 1.5337 10 2.5766 1.5128 11 2.5649 1.2533 12 2.2325 0.8064 13 2.2292 0.7913 14 2.1659 0.7893 15 2.1104 0.7772 16 2.1027 0.7549 17 1.9481 0.7483 18 1.8946 0.7392 19 1.8026 0.6989 20 1.7959 0.6935 21 1.7673 0.6898 22 1.7352 0.6813 23 1.5405 0.6770 24 1.5143 0.6742 25 1.5138 0.6732 26 1.4781 0.6694 27 1.4356 0.6691 28 1.4128 0.6666 29 1.3578 0.6652 30 1.3468 0.6646 31 1.3396 0.6637 32 1.2732 0.6635 33 1.2496 0.6579 34 1.1856 0.6555 35 1.1700 0.6553 36 1.1575 0.6497 37 1.1132 0.6415 38 1.0757 0.6407 39 1.0737 0.6404 40 1.0412 0.6000 41 1.0376 0.5912 42 1.0146 0.5864 43 1.0035 0.5856 44 0.9142 0.5811 45 0.8783 0.5792 46 0.8433 0.5788 47 0.8380 0.5713 48 0.8303 0.5644 49 0.7875 0.5604 50 0.7714 0.5602 51 0.7363 0.5574 52 0.7276 0.5567 53 0.6737 0.5494 54 0.6540 0.5360 55 0.6463 0.5294 56 0.6109 0.4918 57 0.5645 0.4839 58 0.4886 0.4711 59 0.4703 0.4674 60 0.3853 0.4496 61 0.2482 0.4488 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:36:26 PM Page 14 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:36:26 PM Page 15 Duration Flows The Facility PASSED Flow(cfs)Predev Mit Percentage Pass/Fail 0.6661 10857 10932 100 Pass 0.7092 9278 7358 79 Pass 0.7523 7931 4800 60 Pass 0.7955 6793 2169 31 Pass 0.8386 5938 1738 29 Pass 0.8818 5197 1661 31 Pass 0.9249 4558 1547 33 Pass 0.9680 4006 1481 36 Pass 1.0112 3480 1434 41 Pass 1.0543 3065 1380 45 Pass 1.0974 2691 1329 49 Pass 1.1406 2368 1268 53 Pass 1.1837 2080 1213 58 Pass 1.2269 1862 1167 62 Pass 1.2700 1631 1100 67 Pass 1.3131 1413 1044 73 Pass 1.3563 1240 987 79 Pass 1.3994 1128 906 80 Pass 1.4426 1031 825 80 Pass 1.4857 931 722 77 Pass 1.5288 835 609 72 Pass 1.5720 745 531 71 Pass 1.6151 645 473 73 Pass 1.6582 529 408 77 Pass 1.7014 456 347 76 Pass 1.7445 384 285 74 Pass 1.7877 334 236 70 Pass 1.8308 276 211 76 Pass 1.8739 230 181 78 Pass 1.9171 200 158 79 Pass 1.9602 177 135 76 Pass 2.0034 150 116 77 Pass 2.0465 132 91 68 Pass 2.0896 111 78 70 Pass 2.1328 91 60 65 Pass 2.1759 74 48 64 Pass 2.2191 63 40 63 Pass 2.2622 56 36 64 Pass 2.3053 50 25 50 Pass 2.3485 43 22 51 Pass 2.3916 40 20 50 Pass 2.4347 37 19 51 Pass 2.4779 34 18 52 Pass 2.5210 32 17 53 Pass 2.5642 31 17 54 Pass 2.6073 25 15 60 Pass 2.6504 24 14 58 Pass 2.6936 22 14 63 Pass 2.7367 21 13 61 Pass 2.7799 19 12 63 Pass 2.8230 18 10 55 Pass 2.8661 18 9 50 Pass 2.9093 18 8 44 Pass 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:36:26 PM Page 16 2.9524 15 7 46 Pass 2.9955 15 6 40 Pass 3.0387 15 6 40 Pass 3.0818 15 5 33 Pass 3.1250 14 4 28 Pass 3.1681 12 4 33 Pass 3.2112 12 4 33 Pass 3.2544 11 2 18 Pass 3.2975 11 0 0 Pass 3.3407 11 0 0 Pass 3.3838 11 0 0 Pass 3.4269 10 0 0 Pass 3.4701 9 0 0 Pass 3.5132 7 0 0 Pass 3.5564 7 0 0 Pass 3.5995 7 0 0 Pass 3.6426 7 0 0 Pass 3.6858 7 0 0 Pass 3.7289 7 0 0 Pass 3.7720 6 0 0 Pass 3.8152 6 0 0 Pass 3.8583 6 0 0 Pass 3.9015 6 0 0 Pass 3.9446 6 0 0 Pass 3.9877 4 0 0 Pass 4.0309 3 0 0 Pass 4.0740 3 0 0 Pass 4.1172 3 0 0 Pass 4.1603 3 0 0 Pass 4.2034 3 0 0 Pass 4.2466 2 0 0 Pass 4.2897 2 0 0 Pass 4.3328 2 0 0 Pass 4.3760 2 0 0 Pass 4.4191 2 0 0 Pass 4.4623 2 0 0 Pass 4.5054 2 0 0 Pass 4.5485 2 0 0 Pass 4.5917 2 0 0 Pass 4.6348 2 0 0 Pass 4.6780 2 0 0 Pass 4.7211 2 0 0 Pass 4.7642 2 0 0 Pass 4.8074 2 0 0 Pass 4.8505 2 0 0 Pass 4.8937 2 0 0 Pass 4.9368 2 0 0 Pass 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:36:26 PM Page 17 Water Quality Water Quality BMP Flow and Volume for POC #1 On-line facility volume:0 acre-feet On-line facility target flow:0 cfs. Adjusted for 15 min:0 cfs. Off-line facility target flow:0 cfs. Adjusted for 15 min:0 cfs. 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:36:26 PM Page 18 LID Report 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:36:45 PM Page 19 Model Default Modifications Total of 0 changes have been made. PERLND Changes No PERLND changes have been made. IMPLND Changes No IMPLND changes have been made. 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:36:45 PM Page 20 Appendix Predeveloped Schematic 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:36:46 PM Page 21 Mitigated Schematic 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:36:46 PM Page 22 Predeveloped UCI File RUN GLOBAL WWHM4 model simulation START 1948 10 01 END 2009 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 FWHS_FC.wdm MESSU 25 PreFWHS_FC.MES 27 PreFWHS_FC.L61 28 PreFWHS_FC.L62 30 POCFWHS_FC1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 10 PERLND 16 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 High School MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** END OPCODE PARM # # K *** END PARM END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 10 C, Forest, Flat 1 1 1 1 27 0 16 C, Lawn, Flat 1 1 1 1 27 0 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 10 0 0 1 0 0 0 0 0 0 0 0 0 16 0 0 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:36:47 PM Page 23 10 0 0 4 0 0 0 0 0 0 0 0 0 1 9 16 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 10 0 0 0 0 0 0 0 0 0 0 0 16 0 0 0 0 0 0 0 0 0 0 0 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC 10 0 4.5 0.08 400 0.05 0.5 0.996 16 0 4.5 0.03 400 0.05 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 10 0 0 2 2 0 0 0 16 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 10 0.2 0.5 0.35 6 0.5 0.7 16 0.1 0.25 0.25 6 0.5 0.25 END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS 10 0 0 0 0 2.5 1 0 16 0 0 0 0 2.5 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC END IWAT-PARM2 IWAT-PARM3 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:36:47 PM Page 24 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS END IWAT-STATE1 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** High School*** PERLND 10 18.83 COPY 501 12 PERLND 10 18.83 COPY 501 13 PERLND 16 10.25 COPY 501 12 PERLND 16 10.25 COPY 501 13 Stadium*** PERLND 10 3.14 COPY 501 12 PERLND 10 3.14 COPY 501 13 ******Routing****** END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:36:47 PM Page 25 <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> END HYDR-INIT END RCHRES SPEC-ACTIONS END SPEC-ACTIONS FTABLES END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 IMPLND 1 999 EXTNL PREC WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** COPY 501 OUTPUT MEAN 1 1 48.4 WDM 501 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 12 PERLND PWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 12 MASS-LINK 13 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS-LINK 13 END MASS-LINK END RUN 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:36:47 PM Page 26 Mitigated UCI File RUN GLOBAL WWHM4 model simulation START 1948 10 01 END 2009 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 FWHS_FC.wdm MESSU 25 MitFWHS_FC.MES 27 MitFWHS_FC.L61 28 MitFWHS_FC.L62 30 POCFWHS_FC1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 16 IMPLND 11 RCHRES 1 COPY 1 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Trapezoidal Pond 1 MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** END OPCODE PARM # # K *** END PARM END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 16 C, Lawn, Flat 1 1 1 1 27 0 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 16 0 0 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:36:47 PM Page 27 16 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 16 0 0 0 0 0 0 0 0 0 0 0 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC 16 0 4.5 0.03 400 0.05 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 16 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 16 0.1 0.25 0.25 6 0.5 0.25 END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS 16 0 0 0 0 2.5 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 11 PARKING/FLAT 1 1 1 27 0 END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** 11 0 0 1 0 0 0 END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* 11 0 0 4 0 0 0 1 9 END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** 11 0 0 0 0 0 END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC 11 400 0.01 0.1 0.1 END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:36:47 PM Page 28 # - # ***PETMAX PETMIN 11 0 0 END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS 11 0 0 END IWAT-STATE1 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** High School*** PERLND 16 16.82 RCHRES 1 2 PERLND 16 16.82 RCHRES 1 3 IMPLND 11 12.26 RCHRES 1 5 Stadium*** PERLND 16 0.93 RCHRES 1 2 PERLND 16 0.93 RCHRES 1 3 IMPLND 11 2.03 RCHRES 1 5 ******Routing****** PERLND 16 16.82 COPY 1 12 IMPLND 11 12.26 COPY 1 15 PERLND 16 16.82 COPY 1 13 PERLND 16 0.93 COPY 1 12 IMPLND 11 2.03 COPY 1 15 PERLND 16 0.93 COPY 1 13 RCHRES 1 1 COPY 501 16 END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** 1 Trapezoidal Pond-007 1 1 1 1 28 0 1 END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** 1 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* 1 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:36:47 PM Page 29 * * * * * * * * * * * * * * *** 1 0 1 0 0 4 0 0 0 0 0 0 0 0 0 2 2 2 2 2 END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** 1 1 0.06 0.0 0.0 0.5 0.0 END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> 1 0 4.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 END HYDR-INIT END RCHRES SPEC-ACTIONS END SPEC-ACTIONS FTABLES FTABLE 1 91 4 Depth Area Volume Outflow1 Velocity Travel Time*** (ft) (acres) (acre-ft) (cfs) (ft/sec) (Minutes)*** 0.000000 0.643365 0.000000 0.000000 0.100000 0.648746 0.064606 0.097748 0.200000 0.654142 0.129750 0.138236 0.300000 0.659556 0.195435 0.169304 0.400000 0.664985 0.261662 0.195495 0.500000 0.670432 0.328433 0.218570 0.600000 0.675894 0.395749 0.239432 0.700000 0.681374 0.463612 0.258616 0.800000 0.686870 0.532025 0.276472 0.900000 0.692382 0.600987 0.293243 1.000000 0.697911 0.670502 0.309105 1.100000 0.703456 0.740570 0.324192 1.200000 0.709018 0.811194 0.338608 1.300000 0.714597 0.882375 0.352434 1.400000 0.720192 0.954114 0.365738 1.500000 0.725803 1.026414 0.378575 1.600000 0.731432 1.099276 0.390991 1.700000 0.737076 1.172701 0.403024 1.800000 0.742737 1.246692 0.414708 1.900000 0.748415 1.321249 0.426072 2.000000 0.754109 1.396376 0.437141 2.100000 0.759820 1.472072 0.447936 2.200000 0.765547 1.548340 0.458477 2.300000 0.771291 1.625182 0.468781 2.400000 0.777051 1.702599 0.478864 2.500000 0.782828 1.780593 0.488738 2.600000 0.788622 1.859166 0.498417 2.700000 0.794432 1.938319 0.507912 2.800000 0.800258 2.018053 0.517232 2.900000 0.806101 2.098371 0.526387 3.000000 0.811961 2.179274 0.535386 3.100000 0.817837 2.260764 0.544236 3.200000 0.823729 2.342842 0.552944 3.300000 0.829638 2.425511 0.561517 3.400000 0.835564 2.508771 0.569962 3.500000 0.841506 2.592624 0.578283 3.600000 0.847465 2.677073 0.586486 3.700000 0.853440 2.762118 0.594576 3.800000 0.859432 2.847762 0.602557 3.900000 0.865440 2.934005 0.610434 4.000000 0.871465 3.020850 0.618210 4.100000 0.877506 3.108299 0.625890 4.200000 0.883564 3.196352 0.633477 4.300000 0.889638 3.285012 0.640974 4.400000 0.895729 3.374281 0.648384 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:36:47 PM Page 30 4.500000 0.901837 3.464159 0.655711 4.600000 0.907961 3.554649 0.662957 4.700000 0.914101 3.645752 0.670124 4.800000 0.920258 3.737470 0.677216 4.900000 0.926432 3.829804 0.684233 5.000000 0.932622 3.922757 0.691180 5.100000 0.938828 4.016330 0.698058 5.200000 0.945051 4.110524 0.704868 5.300000 0.951291 4.205341 0.711614 5.400000 0.957547 4.300783 0.718296 5.500000 0.963820 4.396851 0.724916 5.600000 0.970109 4.493547 0.731476 5.700000 0.976415 4.590874 0.737978 5.800000 0.982737 4.688831 0.744424 5.900000 0.989076 4.787422 0.750814 6.000000 0.995432 4.886647 0.757150 6.100000 1.001803 4.986509 0.763433 6.200000 1.008192 5.087009 0.769666 6.300000 1.014597 5.188148 0.775848 6.400000 1.021018 5.289929 0.781981 6.500000 1.027456 5.392353 0.788067 6.600000 1.033911 5.495421 0.794106 6.700000 1.040382 5.599136 0.800099 6.800000 1.046870 5.703498 1.043078 6.900000 1.053374 5.808511 1.222501 7.000000 1.059894 5.914174 1.347831 7.100000 1.066432 6.020490 1.450759 7.200000 1.072985 6.127461 1.540507 7.300000 1.079556 6.235088 1.621297 7.400000 1.086142 6.343373 1.695482 7.500000 1.092746 6.452317 1.764534 7.600000 1.099365 6.561923 1.958300 7.700000 1.106002 6.672191 2.073152 7.800000 1.112655 6.783124 2.172677 7.900000 1.119324 6.894723 2.263268 8.000000 1.126010 7.006990 2.347562 8.100000 1.132713 7.119926 2.929182 8.200000 1.139432 7.233533 3.906972 8.300000 1.146167 7.347813 5.075971 8.400000 1.152919 7.462767 6.276274 8.500000 1.159688 7.578398 7.350047 8.600000 1.166473 7.694706 8.176858 8.700000 1.173275 7.811693 8.730884 8.800000 1.180093 7.929362 9.237791 8.900000 1.186927 8.047713 9.681596 9.000000 1.193779 8.166748 10.10308 END FTABLE 1 END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 IMPLND 1 999 EXTNL PREC WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP WDM 2 PREC ENGL 1 RCHRES 1 EXTNL PREC WDM 1 EVAP ENGL 0.76 RCHRES 1 EXTNL POTEV END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** RCHRES 1 HYDR RO 1 1 1 WDM 1000 FLOW ENGL REPL RCHRES 1 HYDR STAGE 1 1 1 WDM 1001 STAG ENGL REPL COPY 1 OUTPUT MEAN 1 1 48.4 WDM 701 FLOW ENGL REPL COPY 501 OUTPUT MEAN 1 1 48.4 WDM 801 FLOW ENGL REPL END EXT TARGETS 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:36:47 PM Page 31 MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 2 PERLND PWATER SURO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 2 MASS-LINK 3 PERLND PWATER IFWO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 3 MASS-LINK 5 IMPLND IWATER SURO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 5 MASS-LINK 12 PERLND PWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 12 MASS-LINK 13 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS-LINK 13 MASS-LINK 15 IMPLND IWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 15 MASS-LINK 16 RCHRES ROFLOW COPY INPUT MEAN END MASS-LINK 16 END MASS-LINK END RUN 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:36:47 PM Page 32 Predeveloped HSPF Message File 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:36:48 PM Page 33 Mitigated HSPF Message File 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 FWHS_FC 4/27/2022 12:36:48 PM Page 34 Disclaimer Legal Notice This program and accompanying documentation are provided 'as-is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by End User. Clear Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either expressed or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages. Software Copyright © by : Clear Creek Solutions, Inc. 2005-2022; All Rights Reserved. Clear Creek Solutions, Inc. 6200 Capitol Blvd. Ste F Olympia, WA. 98501 Toll Free 1(866)943-0304 Local (360)943-0304 www.clearcreeksolutions.com 4-3 FLOW CONTROL CALCULATIONS - LEVEL 2 WWHM2012 PROJECT REPORT 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:01:55 PM Page 2 General Model Information Project Name:FWHS_FC_Level3 Site Name: Site Address: City: Report Date:4/27/2022 Gage:Seatac Data Start:1948/10/01 Data End:2009/09/30 Timestep:15 Minute Precip Scale:1.000 Version Date:2021/08/18 Version:4.2.18 POC Thresholds Low Flow Threshold for POC1:50 Percent of the 2 Year High Flow Threshold for POC1:50 Year 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:01:55 PM Page 3 Landuse Basin Data Predeveloped Land Use High School Bypass:No GroundWater:No Pervious Land Use acre C, Lawn, Flat 16.82 Pervious Total 16.82 Impervious Land Use acre PARKING FLAT 12.26 Impervious Total 12.26 Basin Total 29.08 Element Flows To: Surface Interflow Groundwater 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:01:55 PM Page 4 Stadium Bypass:No GroundWater:No Pervious Land Use acre C, Lawn, Flat 1.01 Pervious Total 1.01 Impervious Land Use acre PARKING FLAT 3.35 Impervious Total 3.35 Basin Total 4.36 Element Flows To: Surface Interflow Groundwater 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:01:55 PM Page 5 Subbasin 3 Bypass:No GroundWater:No Pervious Land Use acre C, Lawn, Flat 0.53 Pervious Total 0.53 Impervious Land Use acre PARKING FLAT 3.03 Impervious Total 3.03 Basin Total 3.56 Element Flows To: Surface Interflow Groundwater 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:01:55 PM Page 6 Mitigated Land Use High School Bypass:No GroundWater:No Pervious Land Use acre C, Lawn, Flat 16.82 Pervious Total 16.82 Impervious Land Use acre PARKING FLAT 12.26 Impervious Total 12.26 Basin Total 29.08 Element Flows To: Surface Interflow Groundwater Trapezoidal Pond 1 Trapezoidal Pond 1 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:01:55 PM Page 7 Stadium Bypass:No GroundWater:No Pervious Land Use acre C, Lawn, Flat 1.01 Pervious Total 1.01 Impervious Land Use acre PARKING FLAT 3.03 Impervious Total 3.03 Basin Total 4.04 Element Flows To: Surface Interflow Groundwater Trapezoidal Pond 1 Trapezoidal Pond 1 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:01:55 PM Page 8 Subbasin 3 Bypass:Yes GroundWater:No Pervious Land Use acre C, Lawn, Flat 0.53 Pervious Total 0.53 Impervious Land Use acre PARKING FLAT 3.03 Impervious Total 3.03 Basin Total 3.56 Element Flows To: Surface Interflow Groundwater 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:01:55 PM Page 9 Routing Elements Predeveloped Routing 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:01:55 PM Page 10 Mitigated Routing Trapezoidal Pond 1 Bottom Length:295.00 ft. Bottom Width:95.00 ft. Depth:9 ft. Volume at riser head:7.1199 acre-feet. Side slope 1:3 To 1 Side slope 2:3 To 1 Side slope 3:3 To 1 Side slope 4:3 To 1 Discharge Structure Riser Height:8 ft. Riser Diameter:18 in. Orifice 1 Diameter:3.375 in.Elevation:0 ft. Orifice 2 Diameter:6.25 in.Elevation:6.75 ft. Orifice 3 Diameter:3.875 in.Elevation:7.5 ft. Element Flows To: Outlet 1 Outlet 2 Pond Hydraulic Table Stage(feet)Area(ac.)Volume(ac-ft.)Discharge(cfs)Infilt(cfs) 0.0000 0.643 0.000 0.000 0.000 0.1000 0.648 0.064 0.097 0.000 0.2000 0.654 0.129 0.138 0.000 0.3000 0.659 0.195 0.169 0.000 0.4000 0.665 0.261 0.195 0.000 0.5000 0.670 0.328 0.218 0.000 0.6000 0.675 0.395 0.239 0.000 0.7000 0.681 0.463 0.258 0.000 0.8000 0.686 0.532 0.276 0.000 0.9000 0.692 0.601 0.293 0.000 1.0000 0.697 0.670 0.309 0.000 1.1000 0.703 0.740 0.324 0.000 1.2000 0.709 0.811 0.338 0.000 1.3000 0.714 0.882 0.352 0.000 1.4000 0.720 0.954 0.365 0.000 1.5000 0.725 1.026 0.378 0.000 1.6000 0.731 1.099 0.391 0.000 1.7000 0.737 1.172 0.403 0.000 1.8000 0.742 1.246 0.414 0.000 1.9000 0.748 1.321 0.426 0.000 2.0000 0.754 1.396 0.437 0.000 2.1000 0.759 1.472 0.447 0.000 2.2000 0.765 1.548 0.458 0.000 2.3000 0.771 1.625 0.468 0.000 2.4000 0.777 1.702 0.478 0.000 2.5000 0.782 1.780 0.488 0.000 2.6000 0.788 1.859 0.498 0.000 2.7000 0.794 1.938 0.507 0.000 2.8000 0.800 2.018 0.517 0.000 2.9000 0.806 2.098 0.526 0.000 3.0000 0.812 2.179 0.535 0.000 3.1000 0.817 2.260 0.544 0.000 3.2000 0.823 2.342 0.552 0.000 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:01:55 PM Page 11 3.3000 0.829 2.425 0.561 0.000 3.4000 0.835 2.508 0.570 0.000 3.5000 0.841 2.592 0.578 0.000 3.6000 0.847 2.677 0.586 0.000 3.7000 0.853 2.762 0.594 0.000 3.8000 0.859 2.847 0.602 0.000 3.9000 0.865 2.934 0.610 0.000 4.0000 0.871 3.020 0.618 0.000 4.1000 0.877 3.108 0.625 0.000 4.2000 0.883 3.196 0.633 0.000 4.3000 0.889 3.285 0.641 0.000 4.4000 0.895 3.374 0.648 0.000 4.5000 0.901 3.464 0.655 0.000 4.6000 0.908 3.554 0.663 0.000 4.7000 0.914 3.645 0.670 0.000 4.8000 0.920 3.737 0.677 0.000 4.9000 0.926 3.829 0.684 0.000 5.0000 0.932 3.922 0.691 0.000 5.1000 0.938 4.016 0.698 0.000 5.2000 0.945 4.110 0.704 0.000 5.3000 0.951 4.205 0.711 0.000 5.4000 0.957 4.300 0.718 0.000 5.5000 0.963 4.396 0.724 0.000 5.6000 0.970 4.493 0.731 0.000 5.7000 0.976 4.590 0.738 0.000 5.8000 0.982 4.688 0.744 0.000 5.9000 0.989 4.787 0.750 0.000 6.0000 0.995 4.886 0.757 0.000 6.1000 1.001 4.986 0.763 0.000 6.2000 1.008 5.087 0.769 0.000 6.3000 1.014 5.188 0.775 0.000 6.4000 1.021 5.289 0.782 0.000 6.5000 1.027 5.392 0.788 0.000 6.6000 1.033 5.495 0.794 0.000 6.7000 1.040 5.599 0.800 0.000 6.8000 1.046 5.703 1.043 0.000 6.9000 1.053 5.808 1.222 0.000 7.0000 1.059 5.914 1.347 0.000 7.1000 1.066 6.020 1.450 0.000 7.2000 1.073 6.127 1.540 0.000 7.3000 1.079 6.235 1.621 0.000 7.4000 1.086 6.343 1.695 0.000 7.5000 1.092 6.452 1.764 0.000 7.6000 1.099 6.561 1.958 0.000 7.7000 1.106 6.672 2.073 0.000 7.8000 1.112 6.783 2.172 0.000 7.9000 1.119 6.894 2.263 0.000 8.0000 1.126 7.007 2.347 0.000 8.1000 1.132 7.119 2.929 0.000 8.2000 1.139 7.233 3.907 0.000 8.3000 1.146 7.347 5.076 0.000 8.4000 1.152 7.462 6.276 0.000 8.5000 1.159 7.578 7.350 0.000 8.6000 1.166 7.694 8.176 0.000 8.7000 1.173 7.811 8.730 0.000 8.8000 1.180 7.929 9.237 0.000 8.9000 1.186 8.047 9.681 0.000 9.0000 1.193 8.166 10.10 0.000 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:01:55 PM Page 12 9.1000 1.200 8.286 10.50 0.000 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:01:55 PM Page 13 Analysis Results POC 1 + Predeveloped x Mitigated Predeveloped Landuse Totals for POC #1 Total Pervious Area:18.36 Total Impervious Area:18.64 Mitigated Landuse Totals for POC #1 Total Pervious Area:18.36 Total Impervious Area:18.32 Flow Frequency Method:Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 8.335107 5 year 11.084969 10 year 13.028805 25 year 15.630016 50 year 17.676056 100 year 19.817162 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 1.656788 5 year 2.194505 10 year 2.597185 25 year 3.161532 50 year 3.62416 100 year 4.124671 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1949 11.869 1.970 1950 11.028 2.000 1951 7.358 2.748 1952 5.318 1.196 1953 5.754 1.259 1954 6.768 1.350 1955 7.392 1.428 1956 7.352 1.477 1957 9.068 1.774 1958 6.553 1.329 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 THIS SHOWS THAT THE MITIGATED 100-YEAR FLOW DOES NOT EXCEED THE PREDEVELOPED 100-YEAR FLOW USING EXISTING CONDITIONS FOR THE ENTIRE PARCEL. FWHS_FC_Level3 4/27/2022 3:02:23 PM Page 14 1959 6.032 1.219 1960 7.688 2.069 1961 7.531 1.695 1962 5.834 1.247 1963 7.294 1.437 1964 6.687 1.299 1965 9.531 1.621 1966 5.688 1.261 1967 11.125 1.908 1968 11.464 1.987 1969 8.640 1.616 1970 7.764 1.546 1971 9.276 1.715 1972 11.089 1.763 1973 4.998 1.186 1974 8.841 1.600 1975 9.219 1.813 1976 6.824 1.445 1977 6.463 1.326 1978 8.013 1.610 1979 10.458 1.863 1980 12.755 2.163 1981 8.485 1.699 1982 13.214 2.482 1983 9.185 1.780 1984 6.239 1.200 1985 8.553 1.639 1986 7.419 1.658 1987 10.497 2.005 1988 6.015 1.256 1989 7.523 1.345 1990 19.567 2.975 1991 14.429 2.402 1992 6.185 1.269 1993 5.010 1.050 1994 5.019 1.029 1995 7.410 1.433 1996 9.221 2.844 1997 8.587 2.806 1998 7.496 1.523 1999 17.766 2.718 2000 8.366 1.555 2001 8.070 1.674 2002 11.766 2.186 2003 9.149 1.663 2004 16.345 2.749 2005 7.542 1.577 2006 6.911 1.467 2007 17.610 5.362 2008 14.154 3.347 2009 9.236 1.880 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 19.5668 5.3624 2 17.7657 3.3474 3 17.6095 2.9746 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:02:23 PM Page 15 4 16.3447 2.8436 5 14.4287 2.8062 6 14.1542 2.7495 7 13.2143 2.7485 8 12.7545 2.7181 9 11.8685 2.4822 10 11.7657 2.4016 11 11.4637 2.1857 12 11.1253 2.1626 13 11.0894 2.0693 14 11.0275 2.0053 15 10.4973 1.9996 16 10.4582 1.9869 17 9.5307 1.9697 18 9.2762 1.9085 19 9.2362 1.8797 20 9.2212 1.8630 21 9.2193 1.8128 22 9.1846 1.7795 23 9.1487 1.7744 24 9.0683 1.7630 25 8.8406 1.7146 26 8.6400 1.6986 27 8.5872 1.6951 28 8.5535 1.6744 29 8.4847 1.6630 30 8.3657 1.6580 31 8.0701 1.6387 32 8.0127 1.6213 33 7.7638 1.6159 34 7.6884 1.6096 35 7.5416 1.6002 36 7.5314 1.5773 37 7.5226 1.5550 38 7.4960 1.5457 39 7.4192 1.5228 40 7.4101 1.4771 41 7.3924 1.4674 42 7.3579 1.4446 43 7.3517 1.4373 44 7.2944 1.4328 45 6.9107 1.4277 46 6.8237 1.3500 47 6.7681 1.3448 48 6.6869 1.3286 49 6.5527 1.3263 50 6.4631 1.2993 51 6.2392 1.2686 52 6.1852 1.2610 53 6.0324 1.2588 54 6.0148 1.2559 55 5.8343 1.2469 56 5.7540 1.2189 57 5.6879 1.2004 58 5.3182 1.1958 59 5.0188 1.1858 60 5.0102 1.0497 61 4.9982 1.0287 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:02:23 PM Page 16 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:02:23 PM Page 17 Duration Flows The Facility PASSED Flow(cfs)Predev Mit Percentage Pass/Fail 4.1676 1559 11 0 Pass 4.3040 1397 11 0 Pass 4.4405 1244 9 0 Pass 4.5769 1124 9 0 Pass 4.7134 1010 7 0 Pass 4.8498 906 6 0 Pass 4.9863 819 5 0 Pass 5.1227 743 3 0 Pass 5.2591 676 1 0 Pass 5.3956 615 0 0 Pass 5.5320 566 0 0 Pass 5.6685 517 0 0 Pass 5.8049 475 0 0 Pass 5.9414 441 0 0 Pass 6.0778 406 0 0 Pass 6.2143 374 0 0 Pass 6.3507 350 0 0 Pass 6.4872 327 0 0 Pass 6.6236 307 0 0 Pass 6.7601 285 0 0 Pass 6.8965 263 0 0 Pass 7.0330 249 0 0 Pass 7.1694 227 0 0 Pass 7.3059 211 0 0 Pass 7.4423 194 0 0 Pass 7.5788 178 0 0 Pass 7.7152 163 0 0 Pass 7.8517 152 0 0 Pass 7.9881 143 0 0 Pass 8.1246 135 0 0 Pass 8.2610 129 0 0 Pass 8.3975 121 0 0 Pass 8.5339 112 0 0 Pass 8.6704 107 0 0 Pass 8.8068 105 0 0 Pass 8.9433 100 0 0 Pass 9.0797 95 0 0 Pass 9.2162 87 0 0 Pass 9.3526 79 0 0 Pass 9.4891 76 0 0 Pass 9.6255 73 0 0 Pass 9.7620 71 0 0 Pass 9.8984 66 0 0 Pass 10.0349 64 0 0 Pass 10.1713 62 0 0 Pass 10.3078 59 0 0 Pass 10.4442 54 0 0 Pass 10.5807 52 0 0 Pass 10.7171 50 0 0 Pass 10.8536 46 0 0 Pass 10.9900 45 0 0 Pass 11.1265 41 0 0 Pass 11.2629 37 0 0 Pass 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:02:23 PM Page 18 11.3994 34 0 0 Pass 11.5358 32 0 0 Pass 11.6723 32 0 0 Pass 11.8087 29 0 0 Pass 11.9452 28 0 0 Pass 12.0816 26 0 0 Pass 12.2181 24 0 0 Pass 12.3545 23 0 0 Pass 12.4910 23 0 0 Pass 12.6274 22 0 0 Pass 12.7639 20 0 0 Pass 12.9003 19 0 0 Pass 13.0368 18 0 0 Pass 13.1732 17 0 0 Pass 13.3097 15 0 0 Pass 13.4461 15 0 0 Pass 13.5826 15 0 0 Pass 13.7190 15 0 0 Pass 13.8555 14 0 0 Pass 13.9919 11 0 0 Pass 14.1284 11 0 0 Pass 14.2648 10 0 0 Pass 14.4013 9 0 0 Pass 14.5377 8 0 0 Pass 14.6742 7 0 0 Pass 14.8106 7 0 0 Pass 14.9471 7 0 0 Pass 15.0835 7 0 0 Pass 15.2200 7 0 0 Pass 15.3564 7 0 0 Pass 15.4929 7 0 0 Pass 15.6293 6 0 0 Pass 15.7658 5 0 0 Pass 15.9022 5 0 0 Pass 16.0387 5 0 0 Pass 16.1751 5 0 0 Pass 16.3116 5 0 0 Pass 16.4480 3 0 0 Pass 16.5845 3 0 0 Pass 16.7209 3 0 0 Pass 16.8574 3 0 0 Pass 16.9938 3 0 0 Pass 17.1303 3 0 0 Pass 17.2667 3 0 0 Pass 17.4032 3 0 0 Pass 17.5396 3 0 0 Pass 17.6761 2 0 0 Pass 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:02:23 PM Page 19 Water Quality Water Quality BMP Flow and Volume for POC #1 On-line facility volume:0 acre-feet On-line facility target flow:0 cfs. Adjusted for 15 min:0 cfs. Off-line facility target flow:0 cfs. Adjusted for 15 min:0 cfs. 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:02:23 PM Page 20 LID Report 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:02:31 PM Page 21 Model Default Modifications Total of 0 changes have been made. PERLND Changes No PERLND changes have been made. IMPLND Changes No IMPLND changes have been made. 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:02:31 PM Page 22 Appendix Predeveloped Schematic 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:02:31 PM Page 23 Mitigated Schematic 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:02:32 PM Page 24 Predeveloped UCI File RUN GLOBAL WWHM4 model simulation START 1948 10 01 END 2009 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 FWHS_FC_Level3.wdm MESSU 25 PreFWHS_FC_Level3.MES 27 PreFWHS_FC_Level3.L61 28 PreFWHS_FC_Level3.L62 30 POCFWHS_FC_Level31.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 16 IMPLND 11 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 High School MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** END OPCODE PARM # # K *** END PARM END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 16 C, Lawn, Flat 1 1 1 1 27 0 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 16 0 0 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* 16 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:02:32 PM Page 25 PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 16 0 0 0 0 0 0 0 0 0 0 0 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC 16 0 4.5 0.03 400 0.05 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 16 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 16 0.1 0.25 0.25 6 0.5 0.25 END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS 16 0 0 0 0 2.5 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 11 PARKING/FLAT 1 1 1 27 0 END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** 11 0 0 1 0 0 0 END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* 11 0 0 4 0 0 0 1 9 END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** 11 0 0 0 0 0 END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC 11 400 0.01 0.1 0.1 END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN 11 0 0 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:02:32 PM Page 26 END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS 11 0 0 END IWAT-STATE1 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** High School*** PERLND 16 16.82 COPY 501 12 PERLND 16 16.82 COPY 501 13 IMPLND 11 12.26 COPY 501 15 Stadium*** PERLND 16 1.01 COPY 501 12 PERLND 16 1.01 COPY 501 13 IMPLND 11 3.35 COPY 501 15 Subbasin 3*** PERLND 16 0.53 COPY 501 12 PERLND 16 0.53 COPY 501 13 IMPLND 11 3.03 COPY 501 15 ******Routing****** END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** END HYDR-PARM2 HYDR-INIT 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:02:32 PM Page 27 RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> END HYDR-INIT END RCHRES SPEC-ACTIONS END SPEC-ACTIONS FTABLES END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 IMPLND 1 999 EXTNL PREC WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** COPY 501 OUTPUT MEAN 1 1 48.4 WDM 501 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 12 PERLND PWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 12 MASS-LINK 13 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS-LINK 13 MASS-LINK 15 IMPLND IWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 15 END MASS-LINK END RUN 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:02:32 PM Page 28 Mitigated UCI File RUN GLOBAL WWHM4 model simulation START 1948 10 01 END 2009 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 FWHS_FC_Level3.wdm MESSU 25 MitFWHS_FC_Level3.MES 27 MitFWHS_FC_Level3.L61 28 MitFWHS_FC_Level3.L62 30 POCFWHS_FC_Level31.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 16 IMPLND 11 RCHRES 1 COPY 1 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Trapezoidal Pond 1 MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** END OPCODE PARM # # K *** END PARM END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 16 C, Lawn, Flat 1 1 1 1 27 0 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 16 0 0 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:02:32 PM Page 29 16 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 16 0 0 0 0 0 0 0 0 0 0 0 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC 16 0 4.5 0.03 400 0.05 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 16 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 16 0.1 0.25 0.25 6 0.5 0.25 END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS 16 0 0 0 0 2.5 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 11 PARKING/FLAT 1 1 1 27 0 END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** 11 0 0 1 0 0 0 END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* 11 0 0 4 0 0 0 1 9 END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** 11 0 0 0 0 0 END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC 11 400 0.01 0.1 0.1 END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:02:32 PM Page 30 # - # ***PETMAX PETMIN 11 0 0 END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS 11 0 0 END IWAT-STATE1 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** High School*** PERLND 16 16.82 RCHRES 1 2 PERLND 16 16.82 RCHRES 1 3 IMPLND 11 12.26 RCHRES 1 5 Stadium*** PERLND 16 0.93 RCHRES 1 2 PERLND 16 0.93 RCHRES 1 3 IMPLND 11 2.03 RCHRES 1 5 ******Routing****** PERLND 16 16.82 COPY 1 12 IMPLND 11 12.26 COPY 1 15 PERLND 16 16.82 COPY 1 13 PERLND 16 0.93 COPY 1 12 IMPLND 11 2.03 COPY 1 15 PERLND 16 0.93 COPY 1 13 RCHRES 1 1 COPY 501 16 END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** 1 Trapezoidal Pond-007 1 1 1 1 28 0 1 END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** 1 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* 1 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:02:32 PM Page 31 * * * * * * * * * * * * * * *** 1 0 1 0 0 4 0 0 0 0 0 0 0 0 0 2 2 2 2 2 END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** 1 1 0.06 0.0 0.0 0.5 0.0 END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> 1 0 4.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 END HYDR-INIT END RCHRES SPEC-ACTIONS END SPEC-ACTIONS FTABLES FTABLE 1 91 4 Depth Area Volume Outflow1 Velocity Travel Time*** (ft) (acres) (acre-ft) (cfs) (ft/sec) (Minutes)*** 0.000000 0.643365 0.000000 0.000000 0.100000 0.648746 0.064606 0.097748 0.200000 0.654142 0.129750 0.138236 0.300000 0.659556 0.195435 0.169304 0.400000 0.664985 0.261662 0.195495 0.500000 0.670432 0.328433 0.218570 0.600000 0.675894 0.395749 0.239432 0.700000 0.681374 0.463612 0.258616 0.800000 0.686870 0.532025 0.276472 0.900000 0.692382 0.600987 0.293243 1.000000 0.697911 0.670502 0.309105 1.100000 0.703456 0.740570 0.324192 1.200000 0.709018 0.811194 0.338608 1.300000 0.714597 0.882375 0.352434 1.400000 0.720192 0.954114 0.365738 1.500000 0.725803 1.026414 0.378575 1.600000 0.731432 1.099276 0.390991 1.700000 0.737076 1.172701 0.403024 1.800000 0.742737 1.246692 0.414708 1.900000 0.748415 1.321249 0.426072 2.000000 0.754109 1.396376 0.437141 2.100000 0.759820 1.472072 0.447936 2.200000 0.765547 1.548340 0.458477 2.300000 0.771291 1.625182 0.468781 2.400000 0.777051 1.702599 0.478864 2.500000 0.782828 1.780593 0.488738 2.600000 0.788622 1.859166 0.498417 2.700000 0.794432 1.938319 0.507912 2.800000 0.800258 2.018053 0.517232 2.900000 0.806101 2.098371 0.526387 3.000000 0.811961 2.179274 0.535386 3.100000 0.817837 2.260764 0.544236 3.200000 0.823729 2.342842 0.552944 3.300000 0.829638 2.425511 0.561517 3.400000 0.835564 2.508771 0.569962 3.500000 0.841506 2.592624 0.578283 3.600000 0.847465 2.677073 0.586486 3.700000 0.853440 2.762118 0.594576 3.800000 0.859432 2.847762 0.602557 3.900000 0.865440 2.934005 0.610434 4.000000 0.871465 3.020850 0.618210 4.100000 0.877506 3.108299 0.625890 4.200000 0.883564 3.196352 0.633477 4.300000 0.889638 3.285012 0.640974 4.400000 0.895729 3.374281 0.648384 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:02:32 PM Page 32 4.500000 0.901837 3.464159 0.655711 4.600000 0.907961 3.554649 0.662957 4.700000 0.914101 3.645752 0.670124 4.800000 0.920258 3.737470 0.677216 4.900000 0.926432 3.829804 0.684233 5.000000 0.932622 3.922757 0.691180 5.100000 0.938828 4.016330 0.698058 5.200000 0.945051 4.110524 0.704868 5.300000 0.951291 4.205341 0.711614 5.400000 0.957547 4.300783 0.718296 5.500000 0.963820 4.396851 0.724916 5.600000 0.970109 4.493547 0.731476 5.700000 0.976415 4.590874 0.737978 5.800000 0.982737 4.688831 0.744424 5.900000 0.989076 4.787422 0.750814 6.000000 0.995432 4.886647 0.757150 6.100000 1.001803 4.986509 0.763433 6.200000 1.008192 5.087009 0.769666 6.300000 1.014597 5.188148 0.775848 6.400000 1.021018 5.289929 0.781981 6.500000 1.027456 5.392353 0.788067 6.600000 1.033911 5.495421 0.794106 6.700000 1.040382 5.599136 0.800099 6.800000 1.046870 5.703498 1.043078 6.900000 1.053374 5.808511 1.222501 7.000000 1.059894 5.914174 1.347831 7.100000 1.066432 6.020490 1.450759 7.200000 1.072985 6.127461 1.540507 7.300000 1.079556 6.235088 1.621297 7.400000 1.086142 6.343373 1.695482 7.500000 1.092746 6.452317 1.764534 7.600000 1.099365 6.561923 1.958300 7.700000 1.106002 6.672191 2.073152 7.800000 1.112655 6.783124 2.172677 7.900000 1.119324 6.894723 2.263268 8.000000 1.126010 7.006990 2.347562 8.100000 1.132713 7.119926 2.929182 8.200000 1.139432 7.233533 3.906972 8.300000 1.146167 7.347813 5.075971 8.400000 1.152919 7.462767 6.276274 8.500000 1.159688 7.578398 7.350047 8.600000 1.166473 7.694706 8.176858 8.700000 1.173275 7.811693 8.730884 8.800000 1.180093 7.929362 9.237791 8.900000 1.186927 8.047713 9.681596 9.000000 1.193779 8.166748 10.10308 END FTABLE 1 END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 IMPLND 1 999 EXTNL PREC WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP WDM 2 PREC ENGL 1 RCHRES 1 EXTNL PREC WDM 1 EVAP ENGL 0.76 RCHRES 1 EXTNL POTEV END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** RCHRES 1 HYDR RO 1 1 1 WDM 1000 FLOW ENGL REPL RCHRES 1 HYDR STAGE 1 1 1 WDM 1001 STAG ENGL REPL COPY 1 OUTPUT MEAN 1 1 48.4 WDM 701 FLOW ENGL REPL COPY 501 OUTPUT MEAN 1 1 48.4 WDM 801 FLOW ENGL REPL END EXT TARGETS 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:02:32 PM Page 33 MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 2 PERLND PWATER SURO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 2 MASS-LINK 3 PERLND PWATER IFWO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 3 MASS-LINK 5 IMPLND IWATER SURO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 5 MASS-LINK 12 PERLND PWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 12 MASS-LINK 13 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS-LINK 13 MASS-LINK 15 IMPLND IWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 15 MASS-LINK 16 RCHRES ROFLOW COPY INPUT MEAN END MASS-LINK 16 END MASS-LINK END RUN 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:02:32 PM Page 34 Predeveloped HSPF Message File 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:02:32 PM Page 35 Mitigated HSPF Message File 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 FWHS_FC_Level3 4/27/2022 3:02:32 PM Page 36 Disclaimer Legal Notice This program and accompanying documentation are provided 'as-is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by End User. Clear Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either expressed or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages. Software Copyright © by : Clear Creek Solutions, Inc. 2005-2022; All Rights Reserved. Clear Creek Solutions, Inc. 6200 Capitol Blvd. Ste F Olympia, WA. 98501 Toll Free 1(866)943-0304 Local (360)943-0304 www.clearcreeksolutions.com 4-4 FLOW CONTROL CALCULATIONS - LEVEL 3 1G0002304005402030G13200405004020301G10GCCCCCCCCCCCCCCCCCCSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGNO PARKING VAN FWPS MEMORIAL STADIUM SUBBASIN 2 (WATER QUALITY) IMPERVIOUS: 1.32 AC PERVIOUS: 0.08 AC PROJECT LIMITS EXISTING BIORETENTION FACILITY WATER QUALITY BASIN MAP 4-5 WWHM2012 PROJECT REPORT 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:55:44 PM Page 2 General Model Information Project Name:FWHS_ParkingLot Site Name: Site Address: City: Report Date:4/27/2022 Gage:Seatac Data Start:1948/10/01 Data End:2009/09/30 Timestep:15 Minute Precip Scale:1.000 Version Date:2021/08/18 Version:4.2.18 POC Thresholds Low Flow Threshold for POC1:50 Percent of the 2 Year High Flow Threshold for POC1:50 Year 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:55:44 PM Page 3 Landuse Basin Data Predeveloped Land Use Parking Lot Bypass:No GroundWater:No Pervious Land Use acre C, Forest, Flat 1.4 Pervious Total 1.4 Impervious Land Use acre Impervious Total 0 Basin Total 1.4 Element Flows To: Surface Interflow Groundwater 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:55:44 PM Page 4 Mitigated Land Use Parking Lot Bypass:No GroundWater:No Pervious Land Use acre C, Lawn, Flat 0.08 Pervious Total 0.08 Impervious Land Use acre PARKING FLAT 1.32 Impervious Total 1.32 Basin Total 1.4 Element Flows To: Surface Interflow Groundwater Surface retention 1 Surface retention 1 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:55:44 PM Page 5 Routing Elements Predeveloped Routing 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:55:44 PM Page 6 Mitigated Routing Bioretention 1 Bottom Length: 130.00 ft. Bottom Width: 10.00 ft. Material thickness of first layer: 1.5 Material type for first layer: SMMWW Material thickness of second layer: 1.5 Material type for second layer: Sand Material thickness of third layer: 0 Material type for third layer: GRAVEL Underdrain used Underdrain Diameter (feet):0.5 Orifice Diameter (in.):6 Offset (in.):0 Flow Through Underdrain (ac-ft.):204.046 Total Outflow (ac-ft.):216.81 Percent Through Underdrain:94.11 Discharge Structure Riser Height:1 ft. Riser Diameter:12 in. Element Flows To: Outlet 1 Outlet 2 Bioretention Hydraulic Table Stage(feet)Area(ac.)Volume(ac-ft.)Discharge(cfs)Infilt(cfs) 0.0000 0.0298 0.0000 0.0000 0.0000 0.0495 0.0298 0.0006 0.0000 0.0000 0.0989 0.0298 0.0012 0.0000 0.0000 0.1484 0.0298 0.0018 0.0000 0.0000 0.1978 0.0298 0.0024 0.0000 0.0000 0.2473 0.0298 0.0030 0.0000 0.0000 0.2967 0.0298 0.0036 0.0002 0.0000 0.3462 0.0298 0.0041 0.0004 0.0000 0.3956 0.0298 0.0047 0.0004 0.0000 0.4451 0.0298 0.0053 0.0006 0.0000 0.4945 0.0298 0.0059 0.0007 0.0000 0.5440 0.0298 0.0065 0.0010 0.0000 0.5934 0.0298 0.0071 0.0010 0.0000 0.6429 0.0298 0.0077 0.0014 0.0000 0.6923 0.0298 0.0083 0.0015 0.0000 0.7418 0.0298 0.0089 0.0019 0.0000 0.7912 0.0298 0.0095 0.0021 0.0000 0.8407 0.0298 0.0101 0.0024 0.0000 0.8901 0.0298 0.0107 0.0029 0.0000 0.9396 0.0298 0.0113 0.0031 0.0000 0.9890 0.0298 0.0119 0.0038 0.0000 1.0385 0.0298 0.0124 0.0039 0.0000 1.0879 0.0298 0.0130 0.0048 0.0000 1.1374 0.0298 0.0136 0.0048 0.0000 1.1868 0.0298 0.0142 0.0058 0.0000 1.2363 0.0298 0.0148 0.0060 0.0000 1.2857 0.0298 0.0154 0.0069 0.0000 1.3352 0.0298 0.0160 0.0074 0.0000 1.3846 0.0298 0.0166 0.0082 0.0000 4-6 WATER QUALITY CALCULATIONS THIS SHOWS THAT AT LEAST 92% IS BEING TREATED AND THAT THE EXISTING BIORETENTION FACILITY IS ADEQUATELY SIZED. THESE PARAMETERS MATCH THE CALCULATIONS PROVIDED IN THE FWHS TIR. FWHS_ParkingLot 4/27/2022 12:55:44 PM Page 7 1.4341 0.0298 0.0172 0.0090 0.0000 1.4835 0.0298 0.0178 0.0096 0.0000 1.5330 0.0298 0.0184 0.0107 0.0000 1.5824 0.0298 0.0190 0.0111 0.0000 1.6319 0.0298 0.0195 0.0127 0.0000 1.6813 0.0298 0.0201 0.0127 0.0000 1.7308 0.0298 0.0207 0.0145 0.0000 1.7802 0.0298 0.0213 0.0148 0.0000 1.8297 0.0298 0.0219 0.0164 0.0000 1.8791 0.0298 0.0225 0.0171 0.0000 1.9286 0.0298 0.0231 0.0185 0.0000 1.9780 0.0298 0.0237 0.0197 0.0000 2.0275 0.0298 0.0243 0.0207 0.0000 2.0769 0.0298 0.0249 0.0224 0.0000 2.1264 0.0298 0.0255 0.0231 0.0000 2.1758 0.0298 0.0260 0.0254 0.0000 2.2253 0.0298 0.0266 0.0257 0.0000 2.2747 0.0298 0.0272 0.0283 0.0000 2.3242 0.0298 0.0278 0.0286 0.0000 2.3736 0.0298 0.0284 0.0312 0.0000 2.4231 0.0298 0.0290 0.0321 0.0000 2.4725 0.0298 0.0296 0.0342 0.0000 2.5220 0.0298 0.0302 0.0357 0.0000 2.5714 0.0298 0.0308 0.0374 0.0000 2.6209 0.0298 0.0314 0.0397 0.0000 2.6703 0.0298 0.0319 0.0407 0.0000 2.7198 0.0298 0.0325 0.0438 0.0000 2.7692 0.0298 0.0331 0.0442 0.0000 2.8187 0.0298 0.0337 0.0752 0.0000 2.8681 0.0298 0.0343 0.0752 0.0000 2.9176 0.0298 0.0349 0.0752 0.0000 2.9670 0.0298 0.0355 0.0752 0.0000 3.0000 0.0298 0.0359 0.0752 0.0000 Bioretention Hydraulic Table Stage(feet)Area(ac.)Volume(ac-ft.)Discharge(cfs)To Amended(cfs)Infilt(cfs) 3.0000 0.0298 0.0359 0.0000 0.0451 0.0000 3.0495 0.0308 0.0374 0.0000 0.0451 0.0000 3.0989 0.0318 0.0389 0.0000 0.0481 0.0000 3.1484 0.0327 0.0405 0.0000 0.0496 0.0000 3.1978 0.0337 0.0422 0.0000 0.0511 0.0000 3.2473 0.0347 0.0439 0.0000 0.0526 0.0000 3.2967 0.0356 0.0456 0.0000 0.0541 0.0000 3.3462 0.0366 0.0474 0.0000 0.0556 0.0000 3.3956 0.0376 0.0492 0.0000 0.0570 0.0000 3.4451 0.0386 0.0511 0.0000 0.0585 0.0000 3.4945 0.0396 0.0530 0.0000 0.0600 0.0000 3.5440 0.0406 0.0550 0.0000 0.0615 0.0000 3.5934 0.0416 0.0570 0.0000 0.0630 0.0000 3.6429 0.0426 0.0591 0.0000 0.0645 0.0000 3.6923 0.0436 0.0613 0.0000 0.0660 0.0000 3.7418 0.0446 0.0634 0.0000 0.0675 0.0000 3.7912 0.0456 0.0657 0.0000 0.0689 0.0000 3.8407 0.0466 0.0679 0.0000 0.0704 0.0000 3.8901 0.0477 0.0703 0.0000 0.0719 0.0000 3.9396 0.0487 0.0727 0.0000 0.0734 0.0000 3.9890 0.0497 0.0751 0.0000 0.0749 0.0000 4.0385 0.0508 0.0776 0.0800 0.0764 0.0000 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:55:44 PM Page 8 4.0879 0.0518 0.0801 0.2754 0.0779 0.0000 4.1374 0.0528 0.0827 0.5323 0.0794 0.0000 4.1868 0.0539 0.0853 0.8261 0.0809 0.0000 4.2363 0.0549 0.0880 1.1332 0.0823 0.0000 4.2857 0.0560 0.0908 1.4294 0.0838 0.0000 4.3352 0.0571 0.0936 1.6924 0.0853 0.0000 4.3846 0.0581 0.0964 1.9054 0.0868 0.0000 4.4341 0.0592 0.0993 2.0620 0.0883 0.0000 4.4835 0.0603 0.1023 2.1721 0.0898 0.0000 4.5000 0.0606 0.1033 2.2994 0.0903 0.0000 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:55:44 PM Page 9 Surface retention 1 Element Flows To: Outlet 1 Outlet 2 Bioretention 1 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:55:44 PM Page 10 Analysis Results POC 1 + Predeveloped x Mitigated Predeveloped Landuse Totals for POC #1 Total Pervious Area:1.4 Total Impervious Area:0 Mitigated Landuse Totals for POC #1 Total Pervious Area:0.08 Total Impervious Area:1.32 Flow Frequency Method:Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.041161 5 year 0.064645 10 year 0.077954 25 year 0.092054 50 year 0.100778 100 year 0.108199 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.379613 5 year 0.544602 10 year 0.638418 25 year 0.740642 50 year 0.806408 100 year 0.864538 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1949 0.040 0.340 1950 0.050 0.543 1951 0.091 0.392 1952 0.029 0.292 1953 0.023 0.257 1954 0.035 0.276 1955 0.057 0.378 1956 0.045 0.333 1957 0.036 0.500 1958 0.041 0.266 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:56:10 PM Page 11 1959 0.035 0.285 1960 0.061 0.387 1961 0.035 0.283 1962 0.022 0.194 1963 0.030 0.246 1964 0.039 0.263 1965 0.028 0.261 1966 0.027 0.343 1967 0.056 0.565 1968 0.035 0.474 1969 0.034 0.424 1970 0.028 0.417 1971 0.030 0.398 1972 0.067 0.502 1973 0.031 0.242 1974 0.033 0.227 1975 0.045 0.478 1976 0.033 0.353 1977 0.004 0.178 1978 0.029 0.472 1979 0.017 0.196 1980 0.064 0.436 1981 0.026 0.498 1982 0.049 0.703 1983 0.044 0.513 1984 0.027 0.230 1985 0.016 0.493 1986 0.071 0.398 1987 0.063 0.454 1988 0.025 0.239 1989 0.016 0.074 1990 0.132 0.847 1991 0.079 0.708 1992 0.031 0.309 1993 0.032 0.243 1994 0.011 0.072 1995 0.046 0.343 1996 0.096 0.481 1997 0.081 0.362 1998 0.018 0.320 1999 0.076 0.749 2000 0.032 0.375 2001 0.006 0.252 2002 0.035 0.611 2003 0.044 0.239 2004 0.058 0.902 2005 0.041 0.400 2006 0.049 0.320 2007 0.098 0.771 2008 0.126 0.714 2009 0.062 0.479 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 0.1319 0.9023 2 0.1263 0.8475 3 0.0979 0.7713 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:56:10 PM Page 12 4 0.0964 0.7488 5 0.0906 0.7145 6 0.0806 0.7081 7 0.0794 0.7025 8 0.0756 0.6110 9 0.0713 0.5646 10 0.0675 0.5432 11 0.0640 0.5127 12 0.0631 0.5016 13 0.0620 0.4998 14 0.0613 0.4978 15 0.0576 0.4928 16 0.0566 0.4814 17 0.0560 0.4788 18 0.0504 0.4781 19 0.0492 0.4741 20 0.0487 0.4716 21 0.0458 0.4538 22 0.0451 0.4363 23 0.0450 0.4240 24 0.0445 0.4169 25 0.0441 0.4003 26 0.0413 0.3983 27 0.0409 0.3977 28 0.0404 0.3916 29 0.0389 0.3868 30 0.0363 0.3781 31 0.0355 0.3753 32 0.0351 0.3615 33 0.0349 0.3529 34 0.0349 0.3435 35 0.0346 0.3429 36 0.0342 0.3402 37 0.0333 0.3331 38 0.0326 0.3202 39 0.0319 0.3199 40 0.0318 0.3087 41 0.0307 0.2919 42 0.0306 0.2848 43 0.0301 0.2826 44 0.0295 0.2756 45 0.0286 0.2661 46 0.0286 0.2630 47 0.0282 0.2610 48 0.0278 0.2570 49 0.0272 0.2521 50 0.0268 0.2464 51 0.0256 0.2433 52 0.0249 0.2420 53 0.0231 0.2395 54 0.0215 0.2388 55 0.0182 0.2296 56 0.0173 0.2270 57 0.0162 0.1965 58 0.0161 0.1941 59 0.0107 0.1778 60 0.0057 0.0744 61 0.0039 0.0715 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:56:10 PM Page 13 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:56:10 PM Page 14 Duration Flows Flow(cfs)Predev Mit Percentage Pass/Fail 0.0206 17547 139498 794 Fail 0.0214 16161 135263 836 Fail 0.0222 14964 131498 878 Fail 0.0230 13851 124376 897 Fail 0.0238 12810 121018 944 Fail 0.0246 11807 118515 1003 Fail 0.0254 10898 115393 1058 Fail 0.0263 10119 108185 1069 Fail 0.0271 9383 106174 1131 Fail 0.0279 8729 104270 1194 Fail 0.0287 8143 97340 1195 Fail 0.0295 7593 95373 1256 Fail 0.0303 7060 93555 1325 Fail 0.0311 6588 91801 1393 Fail 0.0319 6145 87095 1417 Fail 0.0327 5777 84486 1462 Fail 0.0335 5431 82411 1517 Fail 0.0344 5097 80336 1576 Fail 0.0352 4808 77577 1613 Fail 0.0360 4524 75011 1658 Fail 0.0368 4252 72636 1708 Fail 0.0376 4017 70412 1752 Fail 0.0384 3782 68786 1818 Fail 0.0392 3546 67032 1890 Fail 0.0400 3337 64530 1933 Fail 0.0408 3138 61322 1954 Fail 0.0416 2950 60103 2037 Fail 0.0425 2785 58862 2113 Fail 0.0433 2599 57514 2212 Fail 0.0441 2447 53087 2169 Fail 0.0449 2304 51504 2235 Fail 0.0457 2160 51226 2371 Fail 0.0465 2025 50734 2505 Fail 0.0473 1898 49750 2621 Fail 0.0481 1790 48681 2719 Fail 0.0489 1687 47440 2812 Fail 0.0497 1585 45815 2890 Fail 0.0506 1483 44232 2982 Fail 0.0514 1379 42649 3092 Fail 0.0522 1292 41024 3175 Fail 0.0530 1218 39441 3238 Fail 0.0538 1155 37837 3275 Fail 0.0546 1098 36190 3295 Fail 0.0554 1048 34650 3306 Fail 0.0562 997 33195 3329 Fail 0.0570 930 31655 3403 Fail 0.0578 883 30180 3417 Fail 0.0587 837 28768 3437 Fail 0.0595 789 27399 3472 Fail 0.0603 743 26052 3506 Fail 0.0611 713 24661 3458 Fail 0.0619 668 23399 3502 Fail 0.0627 630 22180 3520 Fail 0.0635 595 21000 3529 Fail 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:56:10 PM Page 15 0.0643 565 19827 3509 Fail 0.0651 539 18722 3473 Fail 0.0659 496 17663 3561 Fail 0.0668 473 16638 3517 Fail 0.0676 434 15625 3600 Fail 0.0684 399 14549 3646 Fail 0.0692 366 13580 3710 Fail 0.0700 348 12669 3640 Fail 0.0708 323 11798 3652 Fail 0.0716 296 10962 3703 Fail 0.0724 272 10241 3765 Fail 0.0732 256 9576 3740 Fail 0.0740 235 8919 3795 Fail 0.0749 217 8344 3845 Fail 0.0757 195 6444 3304 Fail 0.0765 180 6382 3545 Fail 0.0773 158 6329 4005 Fail 0.0781 145 6280 4331 Fail 0.0789 129 6231 4830 Fail 0.0797 119 6188 5200 Fail 0.0805 109 6132 5625 Fail 0.0813 97 6087 6275 Fail 0.0821 91 6038 6635 Fail 0.0830 82 5991 7306 Fail 0.0838 76 5946 7823 Fail 0.0846 69 5897 8546 Fail 0.0854 61 5854 9596 Fail 0.0862 54 5813 10764 Fail 0.0870 48 5771 12022 Fail 0.0878 41 5713 13934 Fail 0.0886 38 5674 14931 Fail 0.0894 33 5621 17033 Fail 0.0902 27 5572 20637 Fail 0.0911 22 5514 25063 Fail 0.0919 21 5465 26023 Fail 0.0927 20 5418 27090 Fail 0.0935 19 5375 28289 Fail 0.0943 17 5328 31341 Fail 0.0951 14 5296 37828 Fail 0.0959 12 5249 43741 Fail 0.0967 8 5197 64962 Fail 0.0975 4 5155 128875 Fail 0.0983 3 5108 170266 Fail 0.0992 3 5065 168833 Fail 0.1000 3 5031 167700 Fail 0.1008 3 4990 166333 Fail The development has an increase in flow durations from 1/2 Predeveloped 2 year flow to the 2 year flow or more than a 10% increase from the 2 year to the 50 year flow. The development has an increase in flow durations for more than 50% of the flows for the range of the duration analysis. 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:56:10 PM Page 16 Water Quality Water Quality BMP Flow and Volume for POC #1 On-line facility volume:0 acre-feet On-line facility target flow:0 cfs. Adjusted for 15 min:0 cfs. Off-line facility target flow:0 cfs. Adjusted for 15 min:0 cfs. 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:56:10 PM Page 17 LID Report 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:56:28 PM Page 18 Model Default Modifications Total of 0 changes have been made. PERLND Changes No PERLND changes have been made. IMPLND Changes No IMPLND changes have been made. 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:56:28 PM Page 19 Appendix Predeveloped Schematic 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:56:28 PM Page 20 Mitigated Schematic 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:56:29 PM Page 21 Predeveloped UCI File RUN GLOBAL WWHM4 model simulation START 1948 10 01 END 2009 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 FWHS_ParkingLot.wdm MESSU 25 PreFWHS_ParkingLot.MES 27 PreFWHS_ParkingLot.L61 28 PreFWHS_ParkingLot.L62 30 POCFWHS_ParkingLot1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 10 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Parking Lot MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** END OPCODE PARM # # K *** END PARM END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 10 C, Forest, Flat 1 1 1 1 27 0 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 10 0 0 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* 10 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:56:29 PM Page 22 PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 10 0 0 0 0 0 0 0 0 0 0 0 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC 10 0 4.5 0.08 400 0.05 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 10 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 10 0.2 0.5 0.35 6 0.5 0.7 END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS 10 0 0 0 0 2.5 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS END IWAT-STATE1 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:56:29 PM Page 23 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Parking Lot*** PERLND 10 1.4 COPY 501 12 PERLND 10 1.4 COPY 501 13 ******Routing****** END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> END HYDR-INIT END RCHRES SPEC-ACTIONS END SPEC-ACTIONS FTABLES END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 IMPLND 1 999 EXTNL PREC 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:56:29 PM Page 24 WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** COPY 501 OUTPUT MEAN 1 1 48.4 WDM 501 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 12 PERLND PWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 12 MASS-LINK 13 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS-LINK 13 END MASS-LINK END RUN 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:56:29 PM Page 25 Mitigated UCI File RUN GLOBAL WWHM4 model simulation START 1948 10 01 END 2009 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 FWHS_ParkingLot.wdm MESSU 25 MitFWHS_ParkingLot.MES 27 MitFWHS_ParkingLot.L61 28 MitFWHS_ParkingLot.L62 30 POCFWHS_ParkingLot1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 16 IMPLND 11 GENER 2 RCHRES 1 RCHRES 2 COPY 1 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Surface retention 1 MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** 2 24 END OPCODE PARM # # K *** 2 0. END PARM END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 16 C, Lawn, Flat 1 1 1 1 27 0 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 16 0 0 1 0 0 0 0 0 0 0 0 0 END ACTIVITY 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:56:29 PM Page 26 PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* 16 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 16 0 0 0 0 0 0 0 0 0 0 0 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC 16 0 4.5 0.03 400 0.05 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 16 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 16 0.1 0.25 0.25 6 0.5 0.25 END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS 16 0 0 0 0 2.5 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 11 PARKING/FLAT 1 1 1 27 0 END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** 11 0 0 1 0 0 0 END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* 11 0 0 4 0 0 0 1 9 END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** 11 0 0 0 0 0 END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC 11 400 0.01 0.1 0.1 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:56:29 PM Page 27 END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN 11 0 0 END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS 11 0 0 END IWAT-STATE1 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Parking Lot*** PERLND 16 0.08 RCHRES 1 2 PERLND 16 0.08 RCHRES 1 3 IMPLND 11 1.32 RCHRES 1 5 ******Routing****** PERLND 16 0.08 COPY 1 12 IMPLND 11 1.32 COPY 1 15 PERLND 16 0.08 COPY 1 13 RCHRES 1 1 RCHRES 2 8 RCHRES 2 1 COPY 501 16 RCHRES 1 1 COPY 501 17 END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 GENER 2 OUTPUT TIMSER .0011111 RCHRES 1 EXTNL OUTDGT 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** 1 Surface retentio-006 2 1 1 1 28 0 1 2 Bioretention 1 1 1 1 1 28 0 1 END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** 1 1 0 0 0 0 0 0 0 0 0 2 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* 1 4 0 0 0 0 0 0 0 0 0 1 9 2 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO HYDR-PARM1 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:56:29 PM Page 28 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** 1 0 1 0 0 4 5 0 0 0 0 1 0 0 0 2 1 2 2 2 2 0 1 0 0 4 0 0 0 0 0 0 0 0 0 2 2 2 2 2 END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** 1 1 0.01 0.0 0.0 0.0 0.0 2 2 0.02 0.0 0.0 0.0 0.0 END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> 1 0 4.0 5.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2 0 4.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 END HYDR-INIT END RCHRES SPEC-ACTIONS *** User-Defined Variable Quantity Lines *** addr *** <------> *** kwd varnam optyp opn vari s1 s2 s3 tp multiply lc ls ac as agfn *** <****> <----> <----> <-> <----><-><-><-><-><--------> <><-> <><-> <--> *** UVQUAN vol2 RCHRES 2 VOL 4 UVQUAN v2m2 GLOBAL WORKSP 1 3 UVQUAN vpo2 GLOBAL WORKSP 2 3 UVQUAN v2d2 GENER 2 K 1 3 *** User-Defined Target Variable Names *** addr or addr or *** <------> <------> *** kwd varnam ct vari s1 s2 s3 frac oper vari s1 s2 s3 frac oper <****> <----><-> <----><-><-><-> <---> <--> <----><-><-><-> <---> <--> UVNAME v2m2 1 WORKSP 1 1.0 QUAN UVNAME vpo2 1 WORKSP 2 1.0 QUAN UVNAME v2d2 1 K 1 1.0 QUAN *** opt foplop dcdts yr mo dy hr mn d t vnam s1 s2 s3 ac quantity tc ts rp <****><-><--><><-><--> <> <> <> <><><> <----><-><-><-><-><--------> <> <-><-> GENER 2 v2m2 = 1630.6 *** Compute remaining available pore space GENER 2 vpo2 = v2m2 GENER 2 vpo2 -= vol2 *** Check to see if VPORA goes negative; if so set VPORA = 0.0 IF (vpo2 < 0.0) THEN GENER 2 vpo2 = 0.0 END IF *** Infiltration volume GENER 2 v2d2 = vpo2 END SPEC-ACTIONS FTABLES FTABLE 2 62 4 Depth Area Volume Outflow1 Velocity Travel Time*** (ft) (acres) (acre-ft) (cfs) (ft/sec) (Minutes)*** 0.000000 0.029844 0.000000 0.000000 0.049451 0.029844 0.000593 0.000000 0.098901 0.029844 0.001185 0.000000 0.148352 0.029844 0.001778 0.000000 0.197802 0.029844 0.002370 0.000000 0.247253 0.029844 0.002963 0.000000 0.296703 0.029844 0.003555 0.000235 0.346154 0.029844 0.004148 0.000364 0.395604 0.029844 0.004740 0.000413 0.445055 0.029844 0.005333 0.000639 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:56:29 PM Page 29 0.494505 0.029844 0.005925 0.000657 0.543956 0.029844 0.006518 0.000975 0.593407 0.029844 0.007110 0.001016 0.642857 0.029844 0.007703 0.001374 0.692308 0.029844 0.008295 0.001507 0.741758 0.029844 0.008888 0.001860 0.791209 0.029844 0.009481 0.002124 0.840659 0.029844 0.010073 0.002441 0.890110 0.029844 0.010666 0.002876 0.939560 0.029844 0.011258 0.003120 0.989011 0.029844 0.011851 0.003773 1.038462 0.029844 0.012443 0.003904 1.087912 0.029844 0.013036 0.004798 1.137363 0.029844 0.013628 0.004824 1.186813 0.029844 0.014221 0.005807 1.236264 0.029844 0.014813 0.006036 1.285714 0.029844 0.015406 0.006934 1.335165 0.029844 0.015998 0.007418 1.384615 0.029844 0.016591 0.008185 1.434066 0.029844 0.017183 0.008977 1.483516 0.029844 0.017776 0.009564 1.532967 0.029844 0.018366 0.010720 1.582418 0.029844 0.018957 0.011075 1.631868 0.029844 0.019547 0.012654 1.681319 0.029844 0.020137 0.012722 1.730769 0.029844 0.020728 0.014509 1.780220 0.029844 0.021318 0.014786 1.829670 0.029844 0.021908 0.016438 1.879121 0.029844 0.022499 0.017122 1.928571 0.029844 0.023089 0.018515 1.978022 0.029844 0.023679 0.019668 2.027473 0.029844 0.024269 0.020741 2.076923 0.029844 0.024860 0.022429 2.126374 0.029844 0.025450 0.023120 2.175824 0.029844 0.026040 0.025412 2.225275 0.029844 0.026631 0.025656 2.274725 0.029844 0.027221 0.028349 2.324176 0.029844 0.027811 0.028622 2.373626 0.029844 0.028402 0.031203 2.423077 0.029844 0.028992 0.032064 2.472527 0.029844 0.029582 0.034218 2.521978 0.029844 0.030173 0.035743 2.571429 0.029844 0.030763 0.037393 2.620879 0.029844 0.031353 0.039662 2.670330 0.029844 0.031944 0.040721 2.719780 0.029844 0.032534 0.043826 2.769231 0.029844 0.033124 0.044157 2.818681 0.029844 0.033715 0.075231 2.868132 0.029844 0.034305 0.075231 2.917582 0.029844 0.034895 0.075231 2.967033 0.029844 0.035486 0.075231 3.000000 0.029844 0.037433 0.075231 END FTABLE 2 FTABLE 1 32 5 Depth Area Volume Outflow1 Outflow2 Velocity Travel Time*** (ft) (acres) (acre-ft) (cfs) (cfs) (ft/sec) (Minutes)*** 0.000000 0.029844 0.000000 0.000000 0.000000 0.049451 0.030800 0.001499 0.000000 0.045139 0.098901 0.031759 0.003046 0.000000 0.048115 0.148352 0.032723 0.004641 0.000000 0.049603 0.197802 0.033691 0.006283 0.000000 0.051091 0.247253 0.034662 0.007973 0.000000 0.052579 0.296703 0.035638 0.009711 0.000000 0.054068 0.346154 0.036618 0.011497 0.000000 0.055556 0.395604 0.037602 0.013333 0.000000 0.057044 0.445055 0.038590 0.015216 0.000000 0.058532 0.494505 0.039582 0.017149 0.000000 0.060020 0.543956 0.040578 0.019131 0.000000 0.061508 0.593407 0.041578 0.021163 0.000000 0.062996 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:56:29 PM Page 30 0.642857 0.042582 0.023243 0.000000 0.064484 0.692308 0.043590 0.025374 0.000000 0.065972 0.741758 0.044602 0.027555 0.000000 0.067460 0.791209 0.045619 0.029785 0.000000 0.068948 0.840659 0.046639 0.032066 0.000000 0.070437 0.890110 0.047663 0.034398 0.000000 0.071925 0.939560 0.048692 0.036781 0.000000 0.073413 0.989011 0.049724 0.039214 0.000000 0.074901 1.038462 0.050761 0.041698 0.079976 0.076389 1.087912 0.051801 0.044234 0.275387 0.077877 1.137363 0.052846 0.046822 0.532289 0.079365 1.186813 0.053894 0.049461 0.826090 0.080853 1.236264 0.054947 0.052152 1.133165 0.082341 1.285714 0.056003 0.054895 1.429395 0.083829 1.335165 0.057064 0.057691 1.692395 0.085318 1.384615 0.058129 0.060539 1.905359 0.086806 1.434066 0.059198 0.063440 2.061968 0.088294 1.483516 0.060271 0.066394 2.172110 0.089782 1.500000 0.060629 0.067390 2.299375 0.090278 END FTABLE 1 END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 IMPLND 1 999 EXTNL PREC WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP WDM 2 PREC ENGL 1 RCHRES 1 EXTNL PREC WDM 1 EVAP ENGL 0.5 RCHRES 1 EXTNL POTEV WDM 1 EVAP ENGL 0.76 RCHRES 2 EXTNL POTEV END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** RCHRES 2 HYDR RO 1 1 1 WDM 1000 FLOW ENGL REPL RCHRES 2 HYDR STAGE 1 1 1 WDM 1001 STAG ENGL REPL RCHRES 1 HYDR STAGE 1 1 1 WDM 1002 STAG ENGL REPL RCHRES 1 HYDR O 1 1 1 WDM 1003 FLOW ENGL REPL COPY 1 OUTPUT MEAN 1 1 48.4 WDM 701 FLOW ENGL REPL COPY 501 OUTPUT MEAN 1 1 48.4 WDM 801 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 2 PERLND PWATER SURO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 2 MASS-LINK 3 PERLND PWATER IFWO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 3 MASS-LINK 5 IMPLND IWATER SURO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 5 MASS-LINK 8 RCHRES OFLOW OVOL 2 RCHRES INFLOW IVOL END MASS-LINK 8 MASS-LINK 12 PERLND PWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 12 MASS-LINK 13 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:56:29 PM Page 31 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS-LINK 13 MASS-LINK 15 IMPLND IWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 15 MASS-LINK 16 RCHRES ROFLOW COPY INPUT MEAN END MASS-LINK 16 MASS-LINK 17 RCHRES OFLOW OVOL 1 COPY INPUT MEAN END MASS-LINK 17 END MASS-LINK END RUN 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:56:29 PM Page 32 Predeveloped HSPF Message File 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:56:29 PM Page 33 Mitigated HSPF Message File 4-6 WATER QUALITY CALCULATIONS FWHS_ParkingLot 4/27/2022 12:56:29 PM Page 34 Disclaimer Legal Notice This program and accompanying documentation are provided 'as-is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by End User. Clear Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either expressed or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages. Software Copyright © by : Clear Creek Solutions, Inc. 2005-2022; All Rights Reserved. Clear Creek Solutions, Inc. 6200 Capitol Blvd. Ste F Olympia, WA. 98501 Toll Free 1(866)943-0304 Local (360)943-0304 www.clearcreeksolutions.com 4-6 WATER QUALITY CALCULATIONS 1G0002304005402030G13200405004020301G10GCCCCCCCCCCCCCCCCCCSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGNO PARKING VAN FWPS MEMORIAL STADIUM PROJECT LIMITS NEW BIORETENTION FACILITY TARGETED AREAS FOR FLOW CONTROL BMPS MAP 4-7 TARGETED AREA FOR FLOW CONTROL BMPS IMPERVIOUS: 1.60 AC PERVIOUS: 0.67 AC 1G0002304005402030G13200405004020301G10GCCCCCCCCCCCCCCCCCCSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGSTAFF PARKINGNO PARKING VAN FWPS MEMORIAL STADIUM SUBBASIN 1 (SWAPPED AREA FOR CONTROL BMPS) IMPERVIOUS: 1.69 AC PERVIOUS: 0.70 AC PROJECT LIMITS NEW BIORETENTION FACILITY SWAPPED AREAS FOR FLOW CONTROL BMPS MAP 4-8 WWHM2012 PROJECT REPORT 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:07 PM Page 2 General Model Information Project Name:FWHS_WQ Site Name: Site Address: City: Report Date:4/27/2022 Gage:Seatac Data Start:1948/10/01 Data End:2009/09/30 Timestep:15 Minute Precip Scale:1.000 Version Date:2021/08/18 Version:4.2.18 POC Thresholds Low Flow Threshold for POC1:50 Percent of the 2 Year High Flow Threshold for POC1:50 Year 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:07 PM Page 3 Landuse Basin Data Predeveloped Land Use Stadium Bypass:No GroundWater:No Pervious Land Use acre C, Forest, Flat 2.39 Pervious Total 2.39 Impervious Land Use acre Impervious Total 0 Basin Total 2.39 Element Flows To: Surface Interflow Groundwater 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:07 PM Page 4 Mitigated Land Use Stadium Bypass:No GroundWater:No Pervious Land Use acre C, Lawn, Flat 0.7 Pervious Total 0.7 Impervious Land Use acre PARKING FLAT 1.69 Impervious Total 1.69 Basin Total 2.39 Element Flows To: Surface Interflow Groundwater Surface retention 1 Surface retention 1 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:07 PM Page 5 Routing Elements Predeveloped Routing 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:07 PM Page 6 Mitigated Routing Bioretention 1 Bottom Length: 40.00 ft. Bottom Width: 40.00 ft. Material thickness of first layer: 1.5 Material type for first layer: SMMWW Material thickness of second layer: 1.5 Material type for second layer: Sand Material thickness of third layer: 0 Material type for third layer: GRAVEL Underdrain used Underdrain Diameter (feet):0.5 Orifice Diameter (in.):6 Offset (in.):0 Flow Through Underdrain (ac-ft.):299.47 Total Outflow (ac-ft.):324.057 Percent Through Underdrain:92.41 Discharge Structure Riser Height:1 ft. Riser Diameter:12 in. Element Flows To: Outlet 1 Outlet 2 Bioretention Hydraulic Table Stage(feet)Area(ac.)Volume(ac-ft.)Discharge(cfs)Infilt(cfs) 0.0000 0.0367 0.0000 0.0000 0.0000 0.0549 0.0367 0.0008 0.0000 0.0000 0.1099 0.0367 0.0016 0.0000 0.0000 0.1648 0.0367 0.0024 0.0000 0.0000 0.2198 0.0367 0.0032 0.0000 0.0000 0.2747 0.0367 0.0041 0.0000 0.0000 0.3297 0.0367 0.0049 0.0004 0.0000 0.3846 0.0367 0.0057 0.0005 0.0000 0.4396 0.0367 0.0065 0.0006 0.0000 0.4945 0.0367 0.0073 0.0010 0.0000 0.5495 0.0367 0.0081 0.0010 0.0000 0.6044 0.0367 0.0089 0.0015 0.0000 0.6593 0.0367 0.0097 0.0016 0.0000 0.7143 0.0367 0.0105 0.0021 0.0000 0.7692 0.0367 0.0113 0.0023 0.0000 0.8242 0.0367 0.0122 0.0029 0.0000 0.8791 0.0367 0.0130 0.0033 0.0000 0.9341 0.0367 0.0138 0.0038 0.0000 0.9890 0.0367 0.0146 0.0045 0.0000 1.0440 0.0367 0.0154 0.0049 0.0000 1.0989 0.0367 0.0162 0.0059 0.0000 1.1538 0.0367 0.0170 0.0062 0.0000 1.2088 0.0367 0.0178 0.0076 0.0000 1.2637 0.0367 0.0186 0.0076 0.0000 1.3187 0.0367 0.0194 0.0092 0.0000 1.3736 0.0367 0.0203 0.0095 0.0000 1.4286 0.0367 0.0211 0.0110 0.0000 1.4835 0.0367 0.0219 0.0117 0.0000 1.5385 0.0367 0.0227 0.0130 0.0000 4-9 FLOW CONTROL BMPS CALCULATIONS THIS SHOWS THAT A BIORETENTION FACILITY WITH A BOTTOM AREA OF AT LEAST 1,600 SQUARE FEET WILL ADEQUATELY TREAT THE TRIBUTARY RUNOFF. FWHS_WQ 4/27/2022 12:43:07 PM Page 7 1.5934 0.0367 0.0235 0.0142 0.0000 1.6484 0.0367 0.0243 0.0152 0.0000 1.7033 0.0367 0.0251 0.0170 0.0000 1.7582 0.0367 0.0259 0.0176 0.0000 1.8132 0.0367 0.0267 0.0201 0.0000 1.8681 0.0367 0.0275 0.0202 0.0000 1.9231 0.0367 0.0283 0.0231 0.0000 1.9780 0.0367 0.0291 0.0235 0.0000 2.0330 0.0367 0.0300 0.0262 0.0000 2.0879 0.0367 0.0308 0.0272 0.0000 2.1429 0.0367 0.0316 0.0295 0.0000 2.1978 0.0367 0.0324 0.0313 0.0000 2.2527 0.0367 0.0332 0.0330 0.0000 2.3077 0.0367 0.0340 0.0357 0.0000 2.3626 0.0367 0.0348 0.0368 0.0000 2.4176 0.0367 0.0356 0.0404 0.0000 2.4725 0.0367 0.0364 0.0409 0.0000 2.5275 0.0367 0.0372 0.0451 0.0000 2.5824 0.0367 0.0380 0.0456 0.0000 2.6374 0.0367 0.0388 0.0497 0.0000 2.6923 0.0367 0.0396 0.0511 0.0000 2.7473 0.0367 0.0404 0.0543 0.0000 2.8022 0.0367 0.0413 0.0926 0.0000 2.8571 0.0367 0.0421 0.0926 0.0000 2.9121 0.0367 0.0429 0.0926 0.0000 2.9670 0.0367 0.0437 0.0926 0.0000 3.0000 0.0367 0.0442 0.0926 0.0000 Bioretention Hydraulic Table Stage(feet)Area(ac.)Volume(ac-ft.)Discharge(cfs)To Amended(cfs)Infilt(cfs) 3.0000 0.0367 0.0442 0.0000 0.0556 0.0000 3.0549 0.0373 0.0462 0.0000 0.0556 0.0000 3.1099 0.0380 0.0483 0.0000 0.0596 0.0000 3.1648 0.0386 0.0504 0.0000 0.0617 0.0000 3.2198 0.0392 0.0525 0.0000 0.0637 0.0000 3.2747 0.0398 0.0547 0.0000 0.0657 0.0000 3.3297 0.0405 0.0569 0.0000 0.0678 0.0000 3.3846 0.0411 0.0591 0.0000 0.0698 0.0000 3.4396 0.0417 0.0614 0.0000 0.0718 0.0000 3.4945 0.0424 0.0637 0.0000 0.0739 0.0000 3.5495 0.0430 0.0660 0.0000 0.0759 0.0000 3.6044 0.0437 0.0684 0.0000 0.0779 0.0000 3.6593 0.0444 0.0709 0.0000 0.0800 0.0000 3.7143 0.0450 0.0733 0.0000 0.0820 0.0000 3.7692 0.0457 0.0758 0.0000 0.0840 0.0000 3.8242 0.0464 0.0783 0.0000 0.0861 0.0000 3.8791 0.0471 0.0809 0.0000 0.0881 0.0000 3.9341 0.0477 0.0835 0.0000 0.0902 0.0000 3.9890 0.0484 0.0861 0.0000 0.0922 0.0000 4.0440 0.0491 0.0888 0.0977 0.0942 0.0000 4.0989 0.0498 0.0915 0.3281 0.0963 0.0000 4.1538 0.0505 0.0943 0.6273 0.0983 0.0000 4.2088 0.0513 0.0971 0.9624 0.1003 0.0000 4.2637 0.0520 0.0999 1.3006 0.1024 0.0000 4.3187 0.0527 0.1028 1.6096 0.1044 0.0000 4.3736 0.0534 0.1057 1.8629 0.1064 0.0000 4.4286 0.0542 0.1087 2.0472 0.1085 0.0000 4.4835 0.0549 0.1117 2.1721 0.1105 0.0000 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:07 PM Page 8 4.5385 0.0556 0.1147 2.3112 0.1125 0.0000 4.5934 0.0564 0.1178 2.4263 0.1146 0.0000 4.6484 0.0571 0.1209 2.5361 0.1166 0.0000 4.7033 0.0579 0.1241 2.6414 0.1186 0.0000 4.7582 0.0587 0.1273 2.7426 0.1207 0.0000 4.8132 0.0594 0.1305 2.8402 0.1227 0.0000 4.8681 0.0602 0.1338 2.9346 0.1247 0.0000 4.9231 0.0610 0.1371 3.0261 0.1268 0.0000 4.9780 0.0618 0.1405 3.1148 0.1288 0.0000 5.0000 0.0621 0.1419 3.2011 0.1296 0.0000 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:07 PM Page 9 Surface retention 1 Element Flows To: Outlet 1 Outlet 2 Bioretention 1 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:07 PM Page 10 Analysis Results POC 1 + Predeveloped x Mitigated Predeveloped Landuse Totals for POC #1 Total Pervious Area:2.39 Total Impervious Area:0 Mitigated Landuse Totals for POC #1 Total Pervious Area:0.7 Total Impervious Area:1.69 Flow Frequency Method:Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.070268 5 year 0.110359 10 year 0.133079 25 year 0.157149 50 year 0.172043 100 year 0.184712 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.534541 5 year 0.761252 10 year 0.912144 25 year 1.102853 50 year 1.244733 100 year 1.386377 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1949 0.069 0.641 1950 0.086 0.797 1951 0.155 0.549 1952 0.049 0.392 1953 0.039 0.426 1954 0.061 0.384 1955 0.097 0.516 1956 0.077 0.458 1957 0.062 0.688 1958 0.070 0.362 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:33 PM Page 11 1959 0.060 0.378 1960 0.105 0.547 1961 0.059 0.558 1962 0.037 0.260 1963 0.050 0.337 1964 0.066 0.408 1965 0.048 0.372 1966 0.046 0.481 1967 0.096 0.786 1968 0.060 0.672 1969 0.058 0.606 1970 0.048 0.572 1971 0.051 0.570 1972 0.115 0.708 1973 0.052 0.377 1974 0.057 0.437 1975 0.077 0.667 1976 0.056 0.490 1977 0.007 0.293 1978 0.049 0.638 1979 0.030 0.310 1980 0.109 0.859 1981 0.044 0.669 1982 0.084 0.990 1983 0.075 0.693 1984 0.046 0.315 1985 0.028 0.668 1986 0.122 0.549 1987 0.108 0.592 1988 0.043 0.336 1989 0.028 0.213 1990 0.225 1.274 1991 0.136 1.023 1992 0.052 0.443 1993 0.054 0.328 1994 0.018 0.162 1995 0.078 0.492 1996 0.165 0.689 1997 0.138 0.569 1998 0.031 0.442 1999 0.129 1.163 2000 0.054 0.526 2001 0.010 0.457 2002 0.060 0.864 2003 0.076 0.320 2004 0.098 1.243 2005 0.071 0.559 2006 0.083 0.456 2007 0.167 1.067 2008 0.216 1.033 2009 0.106 0.671 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 0.2252 1.2739 2 0.2157 1.2427 3 0.1672 1.1627 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:33 PM Page 12 4 0.1646 1.0669 5 0.1547 1.0328 6 0.1376 1.0226 7 0.1356 0.9895 8 0.1291 0.8642 9 0.1218 0.8592 10 0.1152 0.7970 11 0.1092 0.7859 12 0.1077 0.7076 13 0.1059 0.6926 14 0.1046 0.6885 15 0.0983 0.6881 16 0.0966 0.6715 17 0.0955 0.6709 18 0.0861 0.6693 19 0.0839 0.6684 20 0.0832 0.6673 21 0.0781 0.6409 22 0.0770 0.6382 23 0.0768 0.6062 24 0.0760 0.5916 25 0.0753 0.5717 26 0.0706 0.5701 27 0.0699 0.5689 28 0.0690 0.5591 29 0.0664 0.5580 30 0.0620 0.5494 31 0.0606 0.5488 32 0.0599 0.5471 33 0.0596 0.5260 34 0.0595 0.5158 35 0.0590 0.4921 36 0.0583 0.4903 37 0.0568 0.4808 38 0.0557 0.4578 39 0.0545 0.4573 40 0.0543 0.4563 41 0.0523 0.4435 42 0.0523 0.4423 43 0.0514 0.4375 44 0.0504 0.4259 45 0.0488 0.4077 46 0.0488 0.3924 47 0.0481 0.3843 48 0.0475 0.3785 49 0.0465 0.3768 50 0.0457 0.3720 51 0.0436 0.3623 52 0.0425 0.3372 53 0.0394 0.3362 54 0.0367 0.3278 55 0.0311 0.3200 56 0.0295 0.3148 57 0.0277 0.3104 58 0.0276 0.2932 59 0.0183 0.2600 60 0.0097 0.2134 61 0.0066 0.1618 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:33 PM Page 13 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:33 PM Page 14 Duration Flows Flow(cfs)Predev Mit Percentage Pass/Fail 0.0351 17554 122857 699 Fail 0.0365 16166 115842 716 Fail 0.0379 14970 111671 745 Fail 0.0393 13851 108869 786 Fail 0.0407 12814 103180 805 Fail 0.0420 11813 98282 831 Fail 0.0434 10898 96036 881 Fail 0.0448 10119 93897 927 Fail 0.0462 9385 86325 919 Fail 0.0476 8729 84208 964 Fail 0.0490 8143 82026 1007 Fail 0.0503 7593 77941 1026 Fail 0.0517 7060 73535 1041 Fail 0.0531 6588 70776 1074 Fail 0.0545 6147 67824 1103 Fail 0.0559 5777 67268 1164 Fail 0.0573 5431 66434 1223 Fail 0.0586 5097 64701 1269 Fail 0.0600 4808 62733 1304 Fail 0.0614 4526 60209 1330 Fail 0.0628 4252 57322 1348 Fail 0.0642 4017 54499 1356 Fail 0.0656 3784 51889 1371 Fail 0.0669 3546 49237 1388 Fail 0.0683 3337 46478 1392 Fail 0.0697 3138 43740 1393 Fail 0.0711 2952 41216 1396 Fail 0.0725 2785 38714 1390 Fail 0.0739 2599 36297 1396 Fail 0.0752 2447 33965 1388 Fail 0.0766 2304 31720 1376 Fail 0.0780 2160 29538 1367 Fail 0.0794 2026 27506 1357 Fail 0.0808 1898 25581 1347 Fail 0.0822 1790 23763 1327 Fail 0.0835 1687 22073 1308 Fail 0.0849 1586 20450 1289 Fail 0.0863 1483 18816 1268 Fail 0.0877 1379 17359 1258 Fail 0.0891 1292 15997 1238 Fail 0.0905 1217 14799 1216 Fail 0.0918 1154 13693 1186 Fail 0.0932 1098 10350 942 Fail 0.0946 1048 10245 977 Fail 0.0960 997 10130 1016 Fail 0.0974 930 10006 1075 Fail 0.0987 883 9890 1120 Fail 0.1001 838 9779 1166 Fail 0.1015 789 9653 1223 Fail 0.1029 744 9533 1281 Fail 0.1043 718 9415 1311 Fail 0.1057 671 9278 1382 Fail 0.1070 633 9159 1446 Fail 0.1084 596 9041 1516 Fail 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:33 PM Page 15 0.1098 565 8930 1580 Fail 0.1112 540 8825 1634 Fail 0.1126 498 8682 1743 Fail 0.1140 473 8566 1810 Fail 0.1153 436 8459 1940 Fail 0.1167 400 8367 2091 Fail 0.1181 366 8265 2258 Fail 0.1195 348 8175 2349 Fail 0.1209 324 8072 2491 Fail 0.1223 296 7961 2689 Fail 0.1236 273 7850 2875 Fail 0.1250 256 7747 3026 Fail 0.1264 235 7627 3245 Fail 0.1278 218 7531 3454 Fail 0.1292 198 7422 3748 Fail 0.1306 180 7317 4065 Fail 0.1319 158 7236 4579 Fail 0.1333 145 7133 4919 Fail 0.1347 129 7039 5456 Fail 0.1361 119 6960 5848 Fail 0.1375 109 6864 6297 Fail 0.1389 97 6774 6983 Fail 0.1402 91 6695 7357 Fail 0.1416 82 6605 8054 Fail 0.1430 76 6532 8594 Fail 0.1444 69 6459 9360 Fail 0.1458 61 6387 10470 Fail 0.1472 54 6305 11675 Fail 0.1485 48 6220 12958 Fail 0.1499 41 6115 14914 Fail 0.1513 38 6032 15873 Fail 0.1527 33 5933 17978 Fail 0.1541 27 5856 21688 Fail 0.1554 22 5781 26277 Fail 0.1568 21 5702 27152 Fail 0.1582 20 5632 28160 Fail 0.1596 19 5563 29278 Fail 0.1610 17 5493 32311 Fail 0.1624 14 5414 38671 Fail 0.1637 12 5330 44416 Fail 0.1651 9 5264 58488 Fail 0.1665 4 5197 129925 Fail 0.1679 3 5114 170466 Fail 0.1693 3 5035 167833 Fail 0.1707 3 4960 165333 Fail 0.1720 3 4894 163133 Fail The development has an increase in flow durations from 1/2 Predeveloped 2 year flow to the 2 year flow or more than a 10% increase from the 2 year to the 50 year flow. The development has an increase in flow durations for more than 50% of the flows for the range of the duration analysis. 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:33 PM Page 16 Water Quality Water Quality BMP Flow and Volume for POC #1 On-line facility volume:0 acre-feet On-line facility target flow:0 cfs. Adjusted for 15 min:0 cfs. Off-line facility target flow:0 cfs. Adjusted for 15 min:0 cfs. 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:33 PM Page 17 LID Report 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:52 PM Page 18 Model Default Modifications Total of 0 changes have been made. PERLND Changes No PERLND changes have been made. IMPLND Changes No IMPLND changes have been made. 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:52 PM Page 19 Appendix Predeveloped Schematic 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:52 PM Page 20 Mitigated Schematic 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:53 PM Page 21 Predeveloped UCI File RUN GLOBAL WWHM4 model simulation START 1948 10 01 END 2009 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 FWHS_WQ.wdm MESSU 25 PreFWHS_WQ.MES 27 PreFWHS_WQ.L61 28 PreFWHS_WQ.L62 30 POCFWHS_WQ1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 10 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Stadium MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** END OPCODE PARM # # K *** END PARM END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 10 C, Forest, Flat 1 1 1 1 27 0 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 10 0 0 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* 10 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:53 PM Page 22 PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 10 0 0 0 0 0 0 0 0 0 0 0 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC 10 0 4.5 0.08 400 0.05 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 10 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 10 0.2 0.5 0.35 6 0.5 0.7 END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS 10 0 0 0 0 2.5 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS END IWAT-STATE1 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:53 PM Page 23 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Stadium*** PERLND 10 2.5 COPY 501 12 PERLND 10 2.5 COPY 501 13 ******Routing****** END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> END HYDR-INIT END RCHRES SPEC-ACTIONS END SPEC-ACTIONS FTABLES END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 IMPLND 1 999 EXTNL PREC 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:53 PM Page 24 WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** COPY 501 OUTPUT MEAN 1 1 48.4 WDM 501 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 12 PERLND PWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 12 MASS-LINK 13 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS-LINK 13 END MASS-LINK END RUN 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:53 PM Page 25 Mitigated UCI File RUN GLOBAL WWHM4 model simulation START 1948 10 01 END 2009 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 FWHS_WQ.wdm MESSU 25 MitFWHS_WQ.MES 27 MitFWHS_WQ.L61 28 MitFWHS_WQ.L62 30 POCFWHS_WQ1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 16 IMPLND 11 GENER 2 RCHRES 1 RCHRES 2 COPY 1 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Surface retention 1 MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** 2 24 END OPCODE PARM # # K *** 2 0. END PARM END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 16 C, Lawn, Flat 1 1 1 1 27 0 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 16 0 0 1 0 0 0 0 0 0 0 0 0 END ACTIVITY 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:53 PM Page 26 PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* 16 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 16 0 0 0 0 0 0 0 0 0 0 0 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC 16 0 4.5 0.03 400 0.05 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 16 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 16 0.1 0.25 0.25 6 0.5 0.25 END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS 16 0 0 0 0 2.5 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 11 PARKING/FLAT 1 1 1 27 0 END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** 11 0 0 1 0 0 0 END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* 11 0 0 4 0 0 0 1 9 END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** 11 0 0 0 0 0 END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC 11 400 0.01 0.1 0.1 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:53 PM Page 27 END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN 11 0 0 END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS 11 0 0 END IWAT-STATE1 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Stadium*** PERLND 16 0.7 RCHRES 1 2 PERLND 16 0.7 RCHRES 1 3 IMPLND 11 1.69 RCHRES 1 5 ******Routing****** PERLND 16 0.7 COPY 1 12 IMPLND 11 1.69 COPY 1 15 PERLND 16 0.7 COPY 1 13 RCHRES 1 1 RCHRES 2 8 RCHRES 2 1 COPY 501 16 RCHRES 1 1 COPY 501 17 END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 GENER 2 OUTPUT TIMSER .0011111 RCHRES 1 EXTNL OUTDGT 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** 1 Surface retentio-006 2 1 1 1 28 0 1 2 Bioretention 1 1 1 1 1 28 0 1 END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** 1 1 0 0 0 0 0 0 0 0 0 2 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* 1 4 0 0 0 0 0 0 0 0 0 1 9 2 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO HYDR-PARM1 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:53 PM Page 28 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** 1 0 1 0 0 4 5 0 0 0 0 1 0 0 0 2 1 2 2 2 2 0 1 0 0 4 0 0 0 0 0 0 0 0 0 2 2 2 2 2 END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** 1 1 0.01 0.0 0.0 0.0 0.0 2 2 0.01 0.0 0.0 0.0 0.0 END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> 1 0 4.0 5.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2 0 4.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 END HYDR-INIT END RCHRES SPEC-ACTIONS *** User-Defined Variable Quantity Lines *** addr *** <------> *** kwd varnam optyp opn vari s1 s2 s3 tp multiply lc ls ac as agfn *** <****> <----> <----> <-> <----><-><-><-><-><--------> <><-> <><-> <--> *** UVQUAN vol2 RCHRES 2 VOL 4 UVQUAN v2m2 GLOBAL WORKSP 1 3 UVQUAN vpo2 GLOBAL WORKSP 2 3 UVQUAN v2d2 GENER 2 K 1 3 *** User-Defined Target Variable Names *** addr or addr or *** <------> <------> *** kwd varnam ct vari s1 s2 s3 frac oper vari s1 s2 s3 frac oper <****> <----><-> <----><-><-><-> <---> <--> <----><-><-><-> <---> <--> UVNAME v2m2 1 WORKSP 1 1.0 QUAN UVNAME vpo2 1 WORKSP 2 1.0 QUAN UVNAME v2d2 1 K 1 1.0 QUAN *** opt foplop dcdts yr mo dy hr mn d t vnam s1 s2 s3 ac quantity tc ts rp <****><-><--><><-><--> <> <> <> <><><> <----><-><-><-><-><--------> <> <-><-> GENER 2 v2m2 = 2006.89 *** Compute remaining available pore space GENER 2 vpo2 = v2m2 GENER 2 vpo2 -= vol2 *** Check to see if VPORA goes negative; if so set VPORA = 0.0 IF (vpo2 < 0.0) THEN GENER 2 vpo2 = 0.0 END IF *** Infiltration volume GENER 2 v2d2 = vpo2 END SPEC-ACTIONS FTABLES FTABLE 2 56 4 Depth Area Volume Outflow1 Velocity Travel Time*** (ft) (acres) (acre-ft) (cfs) (ft/sec) (Minutes)*** 0.000000 0.036731 0.000000 0.000000 0.054945 0.036731 0.000810 0.000000 0.109890 0.036731 0.001621 0.000000 0.164835 0.036731 0.002431 0.000000 0.219780 0.036731 0.003241 0.000000 0.274725 0.036731 0.004052 0.000000 0.329670 0.036731 0.004862 0.000354 0.384615 0.036731 0.005672 0.000548 0.439560 0.036731 0.006482 0.000631 0.494505 0.036731 0.007293 0.000976 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:53 PM Page 29 0.549451 0.036731 0.008103 0.001014 0.604396 0.036731 0.008913 0.001516 0.659341 0.036731 0.009724 0.001568 0.714286 0.036731 0.010534 0.002147 0.769231 0.036731 0.011344 0.002343 0.824176 0.036731 0.012155 0.002919 0.879121 0.036731 0.012965 0.003319 0.934066 0.036731 0.013775 0.003840 0.989011 0.036731 0.014585 0.004512 1.043956 0.036731 0.015396 0.004921 1.098901 0.036731 0.016206 0.005937 1.153846 0.036731 0.017016 0.006169 1.208791 0.036731 0.017827 0.007593 1.263736 0.036731 0.018637 0.007607 1.318681 0.036731 0.019447 0.009200 1.373626 0.036731 0.020258 0.009537 1.428571 0.036731 0.021068 0.010998 1.483516 0.036731 0.021878 0.011738 1.538462 0.036731 0.022685 0.012993 1.593407 0.036731 0.023493 0.014222 1.648352 0.036731 0.024300 0.015193 1.703297 0.036731 0.025107 0.017002 1.758242 0.036731 0.025914 0.017604 1.813187 0.036731 0.026722 0.020086 1.868132 0.036731 0.027529 0.020232 1.923077 0.036731 0.028336 0.023082 1.978022 0.036731 0.029144 0.023487 2.032967 0.036731 0.029951 0.026162 2.087912 0.036731 0.030758 0.027214 2.142857 0.036731 0.031565 0.029474 2.197802 0.036731 0.032373 0.031277 2.252747 0.036731 0.033180 0.033026 2.307692 0.036731 0.033987 0.035684 2.362637 0.036731 0.034794 0.036819 2.417582 0.036731 0.035602 0.040444 2.472527 0.036731 0.036409 0.040856 2.527473 0.036731 0.037216 0.045138 2.582418 0.036731 0.038024 0.045566 2.637363 0.036731 0.038831 0.049654 2.692308 0.036731 0.039638 0.051055 2.747253 0.036731 0.040445 0.054347 2.802198 0.036731 0.041253 0.092593 2.857143 0.036731 0.042060 0.092593 2.912088 0.036731 0.042867 0.092593 2.967033 0.036731 0.043675 0.092593 3.000000 0.036731 0.046072 0.092593 END FTABLE 2 FTABLE 1 38 5 Depth Area Volume Outflow1 Outflow2 Velocity Travel Time*** (ft) (acres) (acre-ft) (cfs) (cfs) (ft/sec) (Minutes)*** 0.000000 0.036731 0.000000 0.000000 0.000000 0.054945 0.037339 0.002035 0.000000 0.055556 0.109890 0.037952 0.004103 0.000000 0.059626 0.164835 0.038570 0.006206 0.000000 0.061661 0.219780 0.039193 0.008342 0.000000 0.063696 0.274725 0.039821 0.010513 0.000000 0.065731 0.329670 0.040453 0.012718 0.000000 0.067766 0.384615 0.041091 0.014958 0.000000 0.069801 0.439560 0.041734 0.017234 0.000000 0.071836 0.494505 0.042382 0.019544 0.000000 0.073871 0.549451 0.043035 0.021891 0.000000 0.075906 0.604396 0.043693 0.024274 0.000000 0.077941 0.659341 0.044356 0.026693 0.000000 0.079976 0.714286 0.045024 0.029148 0.000000 0.082011 0.769231 0.045696 0.031640 0.000000 0.084046 0.824176 0.046374 0.034170 0.000000 0.086081 0.879121 0.047057 0.036737 0.000000 0.088116 0.934066 0.047745 0.039341 0.000000 0.090151 0.989011 0.048438 0.041983 0.000000 0.092186 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:53 PM Page 30 1.043956 0.049135 0.044664 0.097690 0.094221 1.098901 0.049838 0.047383 0.328096 0.096256 1.153846 0.050546 0.050141 0.627270 0.098291 1.208791 0.051259 0.052938 0.962367 0.100326 1.263736 0.051976 0.055774 1.300589 0.102361 1.318681 0.052699 0.058649 1.609623 0.104396 1.373626 0.053427 0.061565 1.862893 0.106431 1.428571 0.054159 0.064521 2.047214 0.108466 1.483516 0.054897 0.067517 2.172110 0.110501 1.538462 0.055640 0.070553 2.311197 0.112536 1.593407 0.056387 0.073631 2.426251 0.114571 1.648352 0.057140 0.076750 2.536091 0.116606 1.703297 0.057898 0.079910 2.641368 0.118641 1.758242 0.058660 0.083113 2.742606 0.120676 1.813187 0.059428 0.086357 2.840238 0.122711 1.868132 0.060201 0.089643 2.934624 0.124746 1.923077 0.060978 0.092972 3.026067 0.126781 1.978022 0.061761 0.096344 3.114826 0.128816 2.000000 0.062075 0.097705 3.201126 0.129630 END FTABLE 1 END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 IMPLND 1 999 EXTNL PREC WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP WDM 2 PREC ENGL 1 RCHRES 1 EXTNL PREC WDM 1 EVAP ENGL 0.5 RCHRES 1 EXTNL POTEV WDM 1 EVAP ENGL 0.76 RCHRES 2 EXTNL POTEV END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** RCHRES 2 HYDR RO 1 1 1 WDM 1000 FLOW ENGL REPL RCHRES 2 HYDR STAGE 1 1 1 WDM 1001 STAG ENGL REPL RCHRES 1 HYDR STAGE 1 1 1 WDM 1002 STAG ENGL REPL RCHRES 1 HYDR O 1 1 1 WDM 1003 FLOW ENGL REPL COPY 1 OUTPUT MEAN 1 1 48.4 WDM 701 FLOW ENGL REPL COPY 501 OUTPUT MEAN 1 1 48.4 WDM 801 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 2 PERLND PWATER SURO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 2 MASS-LINK 3 PERLND PWATER IFWO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 3 MASS-LINK 5 IMPLND IWATER SURO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 5 MASS-LINK 8 RCHRES OFLOW OVOL 2 RCHRES INFLOW IVOL END MASS-LINK 8 MASS-LINK 12 PERLND PWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 12 MASS-LINK 13 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:53 PM Page 31 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS-LINK 13 MASS-LINK 15 IMPLND IWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 15 MASS-LINK 16 RCHRES ROFLOW COPY INPUT MEAN END MASS-LINK 16 MASS-LINK 17 RCHRES OFLOW OVOL 1 COPY INPUT MEAN END MASS-LINK 17 END MASS-LINK END RUN 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:53 PM Page 32 Predeveloped HSPF Message File 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:53 PM Page 33 Mitigated HSPF Message File 4-9 FLOW CONTROL BMPS CALCULATIONS FWHS_WQ 4/27/2022 12:43:54 PM Page 34 Disclaimer Legal Notice This program and accompanying documentation are provided 'as-is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by End User. Clear Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either expressed or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages. Software Copyright © by : Clear Creek Solutions, Inc. 2005-2022; All Rights Reserved. Clear Creek Solutions, Inc. 6200 Capitol Blvd. Ste F Olympia, WA. 98501 Toll Free 1(866)943-0304 Local (360)943-0304 www.clearcreeksolutions.com 4-9 FLOW CONTROL BMPS CALCULATIONS TECHNICAL INFORMATION REPORT Project: Federal Way High School 30611 16th Ave S Federal Way, WA 98003 Prepared For: SRG Partnership, Inc. 110 Union Street, Suite 300 Seattle, WA 98101 Fed. Way Proj. #13-101307-00-PC Prepared By: Max Berde, PE Reviewed By: Marc Errichetti, PE Date: August 1, 2014 Federal Way High School Page 2 Project No. 13003 Springline Design LLC TABLE OF CONTENTS Section No. Subject Page No. SECTION I PROJECT OVERVIEW .....................................................................4 SECTION II CONDITIONS AND REQUIREMENTS SUMMARY...................14 SECTION III OFFSITE ANALYSIS......................................................................16 SECTION IV FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN..........................................23 SECTION V CONVEYANCE SYSTEM ANALYSIS AND DESIGN................30 SECTION VI SPECIAL REPORTS AND STUDIES.............................................30 SECTION VII OTHER PERMITS ...........................................................................34 SECTION VIII EROSION AND SEDIMENT CONTROL ......................................34 SECTION IX BOND QUANTITIES ......................................................................35 SECTION X OPERATIONS AND MAINTENANCE MANUAL.......................35 LIST OF FIGURES FIGURE 1 VICINITY MAP.................................................................................7 FIGURE 2 TIR WORKSHEET ............................................................................8 FIGURE 3 EXISTING SITE SOIL CONDITIONS ...........................................11 FIGURE 4 EXISTING LAND COVER .............................................................12 FIGURE 5 DEVELOPED LAND COVER ........................................................13 FIGURE 6 DOWNSTREAM STUDY AREA....................................................18 FIGURE 7 OFFSITE ANALYSIS MAP............................................................19 FIGURE 8 FLOW CONTROL TRADE AREAS...............................................26 FIGURE 9 FLOW CONTROL BMP TARGETED AREAS..............................27 FIGURE 10 BIORETENTION CATCHMENT AREAS.....................................29 FIGURE 11 BACKWATER ANALYSIS ............................................................33 Federal Way High School Page 3 Project No. 13003 Springline Design LLC LIST OF APPENDIXES APPENDIX A WATER QUALITY AND FLOW CONTROL CALCULATIONS APPENDIX B OPERATION AND MAINTENANCE MANUAL APPENDIX C BACKWATER ANALYSIS TABLES APPENDIX D SEDIMENT POND SIZING Federal Way High School Page 4 Project No. 13003 Springline Design LLC SECTION I – PROJECT OVERVIEW General Description: This project consists of the demolition and reconstruction of Federal Way High School (FWHS) on the existing school site. See Figure 1 for a vicinity map of the project area. The new school construction will be completed in stages by a single contractor such that the school grounds can remain occupied and operational throughout the redevelopment. A separate early site work contract is intended to be awarded in early summer of 2014 to allow for dry weather construction of the project detention pond and portions of the proposed storm drain system. ROW improvements for the project include improvements to S 304th Street and S 308th Street to the north and south of the site. On the south margin of S 304th Street, curb, gutter, sidewalk and a landscape strip will be constructed. On the north margin of S 308th Street, from the west property line east to 14th Ave South, curb, gutter, sidewalk and a landscape strip will be constructed. Storm drainage improvements will be constructed in both right-of-ways. This TIR includes details of the stormwater management for the completed project including flow control and water quality analysis, erosion and sediment control, the TIR worksheet, and operation and maintenance manual. Existing Conditions: ROW: Existing conditions in the S 304th Street ROW consist of approximately 32 feet of pavement with no curb or gutter. Runoff sheet flows from the crowned roadway to unimproved gravel and grass shoulders on each side of the road, following the grade of the road to the west. At the very west end of the site frontage is located the upstream end of a 12” ROW storm main which heads west. Existing conditions in the S 308th Street ROW consist of approximately 36 feet of pavement. The portion of the ROW from west property line to 14th Ave South sheet flows to a series of ditch and culverts segments along the north side of the ROW, following the grade of the road to the west. Culvert sizes increase to the west, with the westernmost culvert being a 24” pipe. The portion of the ROW from 14th Ave South to Pacific Highway 99 drains via curb and gutter to an existing 12” storm main on the north side of S 308th Street. This 12” storm drain line follows the grade of the road to the west and discharges to the existing ditch system described above. Federal Way High School Page 5 Project No. 13003 Springline Design LLC Project Site: Existing conditions in the 38.46 acre project site consist of the developed high school campus with existing school district buildings, paved and gravel parking lots, tennis courts, and sports fields. The site is bounded on the west by single-family residential lots, on the north by S. 304th Street, on the east by 16th Ave South and Pacific Highway 99, and to the south by S. 308th Street. The existing school building, including gymnasium, is located in the southeastern quadrant of the site. In the northeast quadrant of the site is a former King County pool building. A school district food services building is located on the southern portion of the site, and Memorial Stadium is located on west central portion of the property. To the west of Memorial Stadium is existing lawn/landscaping and sports fields. The site generally slopes to the south and west from a high point of around 489 feet at the northeast corner to 436 feet at the southeast corner. Total elevation change across the site is approximately 53 feet with slopes generally ranging between 2% and 10%. Existing site drainage is largely collected and conveyed by existing onsite drainage systems consisting of swales, catch basins, area drains, collection structures and pipes. The site has five main subbasins which discharge to the ditch system along the north side of S. 308th Street: Central Kitchen Memorial Stadium/Fields Stadium Parking Southeast School/Parking Northeast School/Parking In addition to the above subbasins, the site has one additional subbasin comprising the Softball Field, which discharges to the storm drain system located at the west end of S. 304th St: Both the S. 308th and the S. 304th ROW drainage systems discharge to Cold Creek to the northwest. See Table 1 below for a summary of existing land cover. See Figure 4 for a graphic representation of existing land cover. Table 1 – Existing Site Land Use Rooftop (Acres) Paving (Acres) Underdrained Fields (Acres) Landscape/ Grass (Acres) Right- of-Way (Acres) Total (Acres) 4.65 6.74 3.48 14.62 0.51 30.00 Federal Way High School Page 6 Project No. 13003 Springline Design LLC Developed Conditions: The developed project includes construction of a new school building and associated plaza areas, loading areas and parking lots on the eastern portion of the site. Additionally, new tennis courts and sports fields will be constructed on the northern portion of the property, and a detention pond will be constructed along the western margin of the site. Memorial Stadium, the Stadium Parking lot, and the Central Kitchen improvements will remain as existing in the developed condition, and their subbasins will continue to discharge to the downstream storm system independently of the developed project. Site runoff will be collected via swales, catch basins, and other collection structures, and will be conveyed via tightline piping to water quality treatment and detention facilities. A detention pond on the western portion of the site will provide Level 3 flow control for targeted surfaces. Upstream of the detention facility, bioretention (raingardens) will provide Enhanced Basic water quality treatment to targeted PGIS surfaces. Flow discharging from the detention pond will be conveyed to the existing City of Federal Way storm drainage system within the S. 308th St. ROW. See Table 2 below for developed site land use summary. See Figure 5 for a graphic representation of developed land cover. Table 2 – Developed Site Land Use Rooftop (Acres) PGIS (Acres) Non- PGIS (Acres) Overlay Ex. Pavement (Acres) Pond (Acres) Underdrained Fields (Acres) Landscape/ Grass (Acres) Total (Acres) 3.05 4.40* 2.89 2.14 1.63 5.64 10.25 30.00 * includes PGIS area (0.51 acres) of ROW improvements S 304nd Street ROW: Right-of-way improvements for S 304th St include construction of curb, gutter, sidewalk and landscape strip on the south side of the ROW for the full site frontage. Associated storm drainage improvements include installation of catch basins and a storm drain main along the proposed curb and gutter. Flow control for S 304th St ROW improvements will be provided in the on site detention system, via a mitigation trade of other non-targeted areas for targeted ROW surfaces. Water quality treatment will be provided by a bioretention area (raingarden) which is located just south of the 304th ROW on the school site. S 308th Street ROW: Right-of-way improvements for S 308th St include construction of curb, gutter, sidewalk and landscape strip on the north side of the ROW from the west property line to14th Ave Federal Way High School Page 7 Project No. 13003 Springline Design LLC S. Storm drainage improvements include installation of catch basins and conveyance along the proposed curb and gutter to replace the existing ditch. Flow control for S 308th St ROW improvements will be provided in the on site detention system, via a mitigation trade of other non-targeted areas for targeted ROW surfaces. Water quality treatment will be provided in the South 304th St raingarden, via a mitigation trade of non-target areas within the 304th St ROW, for targeted S. 308th St surfaces. FIGURE 1 – VICINITY MAP Project Site Federal Way High School Page 8 Project No. 13003 Springline Design LLC FIGURE 2 TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 1 PROJECT OWNER AND PROJECT ENGINEER Part 2 PROJECT LOCATION AND DESCRIPTION Project Owner : Federal Way Public Schools School District #210 Address : 31405 18th Ave S Federal Way, WA 98003 Phone : 253 945 2000 Project Engineer: Marc Errichetti, PE Company: Springline Design, LLC Address/Phone: 206 957 8311 Project Name : Federal Way High School Location : 30611 16th Ave S Township 21N Range 4E Section 8 Part 3 TYPE OF PERMIT APPLICATION Part 4 OTHER REVIEWS AND PERMITS Subdivison Short Subdivision Grading Commercial Other _______________________ _______________________________ DFW HPA Shoreline Management COE 404 Rockery DOE Dam Safety Structural Vaults FEMA Floodplain Other COE Wetlands Part 5 SITE COMMUNITY AND DRAINAGE BASIN Community City of Federal Way Drainage Basin Lower Puget Sound Basin Part 6 SITE CHARACTERISTICS River ________________________________ Stream ___________________________ Critical Stream Reach Depressions/Swales Lake Steep Slopes ______________________ Floodplain ______________________ Wetlands Seeps/Springs High Groundwater Table Groundwater Recharge Other __________________________ Federal Way High School Page 9 Project No. 13003 Springline Design LLC Part 7 SOILS Soil Type Ardents, Alderwood _________________ _________________ _________________ Slopes 0% to 10% _________________ _________________ _________________ Erosion Potential Moderate _________________ _________________ _________________ Erosive Velocities _________________ _________________ _________________ _________________ Additional Sheets Attached Part 8 DEVELOPMENT LIMITATIONS REFERENCE ______________________________ ______________________________ ______________________________ ______________________________ ______________________________ ______________________________ Additional Sheets Attached LIMITATION/SITE CONSTRAINT _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ Part 9 ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION Sedimentation Facilities Stabilized Construction Entrance Perimeter Runoff Control Clearing and Grading Restrictions Cover Practices Construction Sequence Other MINIMUM ESC REQUIREMENTS AFTER CONSTRUCTION Stabilize Exposed Surface Remove and Restore Temporary ESC Facilities Clean and Remove All Silt and Debris Ensure Operation of Permanent Facilities Flag Limits of SAO and open space preservation areas Other Federal Way High School Page 11 Project No. 13003 Springline Design LLC FIGURE 3 – EXISTING SITE SOIL CONDITIONS Project Site Till soils Federal Way High School Page 14 Project No. 13003 Springline Design LLC SECTION II – CONDITIONS AND REQUIREMENTS SUMMARY Core and Special Requirements are listed below along with a discussion of their applicability to this project. Core Requirements: Req. #1 Discharge at Natural Location: Site and ROW: Existing TDA’s will be maintained. Req. #2 Offsite Analysis: See Section III. Req. #3 Flow Control: Site: Flood Problem Area flow control is required and is being provided through the use of an onsite detention pond. Onsite flow control BMPs are provided with the use of bioretention areas. ROW: Flood Problem Area flow control is required for the S. 304th St and S. 308th St ROW improvements and is being provided by the onsite detention pond and mitigation area trades. Req. #4 Conveyance System: Site and ROW: New conveyance systems will be implemented to meet this requirement. Req. #5 Erosion and Sediment Control: Site and ROW: Construction ESC systems will be implemented to meet this requirement. Req. #6 Maintenance and Operations: Site: FWPS will be responsible for maintenance and operations of site stormwater systems. ROW: Public facilities will be owned and maintained by the City. Easements will be provided for public facilities located onsite, as required. Req. #7 Financial Guarantees: Site and ROW: A financial guarantee may be necessary for this project. Federal Way High School Page 15 Project No. 13003 Springline Design LLC Req. #8 Water Quality: Site and ROW: Enhanced Basic water quality treatment is required for the site and right-of-way and is being provided by bioretention treatment areas sized per DOE requirements. In accordance with FWRC Section 19.20.120, “Nonconforming Water Quality Improvements,” all new and existing pollution generating surfaces within the site will be treated by a water quality facility. Special Requirements: Req. #1 Area Specific Requirements: No area specific requirements are applicable to this project. Req. #2: Floodplain/Floodway Delineation Project is not adjacent to any floodplains or floodways. Req. #3 Flood Protection Facilities: Project is not adjacent to applicable area and will not affect any applicable facility. Req. #4 Source Controls: Project is a school project and will provide appropriate source controls when required. Req. #5 Oil Control: There will be no high use areas and therefore oil control is not required. Federal Way High School Page 16 Project No. 13003 Springline Design LLC SECTION III – OFFSITE ANALYSIS Task 1 – Study Area Definition and Maps Maps of the project site and surrounding area were obtained from the King County GIS website. Topographical site information is from the topographical survey for the project and from the King County iMAP. Storm drainage system maps were compiled from Federal Way GIS maps and as-built plans. Aerial images were obtained from Google Maps. Task 2 – Resource Review The Federal Way Public Works Department was contacted regarding the resources listed in section 2.3.1.1 of the 1999 Addendum to KCSWDM. The following is a summary of the resource review: Adopted Basin Plans o Basin Name: Lower Puget Sound Basin (per City of Federal Federal Way Flow Control Applications Map) Finalized Drainage Studies o TIRs from surrounding projects were reviewed. Basin Reconnaissance Summary Reports o None completed to our knowledge. Floodplain/Floodway (FEMA) Maps o The site is not within a floodplain or floodway per FEMA mapping. Other Offsite Analysis Reports o No problems identified. Environmentally Sensitive Areas Map o No environmentally sensitive areas identified on or adjacent to site. Road Drainage Problems o None to our knowledge. USDA Soils Survey o A geotech report has been completed and site soils are primarily glacial till. Wetlands Inventory Maps o No mapped wetlands located on or directly adjacent to site. o Nearest mapped wetlands located approximately 500 feet southwest of the site bordering Easter Lake. Federal Way High School Page 17 Project No. 13003 Springline Design LLC Task 3 – Field Inspection A Level 1 downstream analysis was performed in the morning of September 13, 2013. Weather conditions during the downstream analysis consisted of overcast skies and temperatures of 64-70 degrees F. On-site land use and topography was confirmed and downstream land use was identified as a combination of asphalt streets and forested areas. Refer to Figures 6 and 7 and the Off-Site Analysis Drainage System Tables following this section for detailed information. Runoff from the site discharges into the City of Federal Way conveyance system at several points along the existing ditch that runs along the north side of S 308th Street, and at the northwest corner of the site. All site discharges flow west to 10th Avenue South where the system flows north to where it is discharged in Cold Creek. The storm drain pipes in the closed system were in good condition. Task 4 – Drainage System Description and Problem Description Based on correspondence with the City of Federal Public Works Department, the only known problem with the downstream system is several sections of 36” CMP pipe draining to Cold Creek with the “bottom rusted out of them and are in bad condition” north of Dash Point Road. Task 5 – Mitigation of Existing or Potential Problems Based on the observations made during the field inspection and the requirements for the design of the proposed drainage systems, no negative impacts to the downstream system are anticipated, as flows from the site in the redeveloped condition will be greatly reduced both in duration and peak. Page 1 of 3 OFF-SITE ANALYSIS DRAINAGE SYSTEM TABLE SURFACE WATER DESIGN MANUAL, CORE REQUIREMENT #2 Basin:Federal Way High School Subbasin Name:N/A Subbasin Number:N/A Symbol Drainage Component Type, Name, and Size Drainage Component Description Slope Distance from site discharge Existing Problems Potential Problems Observations of field inspector, resource reviewer, or resident see map Type: sheet flow, swale, stream, channel, pipe, pond; Size: diameter, surface area drainage basin, vegetation, cover, depth, type of sensitive area, volume %1/4 ml = 1,320 ft.constrictions, under capacity, ponding, overtopping, flooding, habitat or organism destruction, scouring, bank sloughing, sedimentation, incision, other erosion tributary area, likelihood of problem, overflow pathways, potential impacts #1 SDMH Circular grate 18” CONC (W) 18” CONC (E) 18” CONC (N) N/A (adjacent to site) CONC (W) good condition CONC (E) sediment and rock observed at invert CONC (N) mineral deposits observed at invert of pipe #2 18” Storm Drain 18” Concrete Pipe 6.7% #3 Catch Basin Type 1 Rectangular grate 18” CONC (W) 18” CONC (E) 18” CONC (S) N/A 12 ft. 18” CONC (W) good condition 18” CONC (E) good condition Sump full of non-moving water #4 18” Storm Drain 18” Concrete Pipe 6.5% Brick headwall in good condition Pipe clear of debris and in good condition #5 24” Storm Drain 24” Concrete Pipe 1.0% Rip rap headwall in good condition Pipe clear of debris and in good condition #6 Catch Basin Type 2 - 72” with “Snout” Debris Guard Rectangular grate 18” CONC (W) 24” CONC (E) 18” CONC (S) 12” IP (NE) N/A 196 ft. Structure full of non-moving water to invert of 12” IP (NE) #6i 12” Storm Drain 12” IP N/A Good condition Page 2 of 3 Symbol Drainage Component Type, Name, and Size Drainage Component Description Slope Distance from site discharge Existing Problems Potential Problems Observations of field inspector, resource reviewer, or resident see map Type: sheet flow, swale, stream, channel, pipe, pond; Size: diameter, surface area drainage basin, vegetation, cover, depth, type of sensitive area, volume %1/4 ml = 1,320 ft.constrictions, under capacity, ponding, overtopping, flooding, habitat or organism destruction, scouring, bank sloughing, sedimentation, incision, other erosion tributary area, likelihood of problem, overflow pathways, potential impacts #7 30” Storm Drain 30” CPP 1.0% #8 Catch Basin Type 2-84” With flat top high lake level and overflow weir vaned grate. 30” CONC(W) 24” CONC (N) 30” CPP (S) N/A 242 ft. Structure partially filled with non- moving water. #9 30” Storm Drain 30” CONC 0.5% #10 Manhole Type 2 -54” 30” CONC (W) 30” CONC (E) N/A 458 ft. Locking lid. #11 30” Storm Drain 30” CONC 0.5% #12 Manhole Type 2 – 54” 30” CONC (W) 30” CONC (E) N/A 674 ft. No sediment observed. #13 30” Storm Drain 30” CONC 0.5% #14 Manhole Type 2 – 72” 30” CONC (E) 24” CONC (N) 24” CONC (S) N/A 744 ft. #15 24” Storm Drain 24” CONC 1.6% #16 Manhole Type 1 – 48” 24” CONC (N) 24” CONC (S) N/A 785 ft. No debris or sediment observed. Pipes in good condition. Page 3 of 3 Symbol Drainage Component Type, Name, and Size Drainage Component Description Slope Distance from site discharge Existing Problems Potential Problems Observations of field inspector, resource reviewer, or resident see map Type: sheet flow, swale, stream, channel, pipe, pond; Size: diameter, surface area drainage basin, vegetation, cover, depth, type of sensitive area, volume %1/4 ml = 1,320 ft.constrictions, under capacity, ponding, overtopping, flooding, habitat or organism destruction, scouring, bank sloughing, sedimentation, incision, other erosion tributary area, likelihood of problem, overflow pathways, potential impacts #17 24” Storm Drain 24” CONC 1.6% #18 Manhole Type 1 – 48” 24” CONC (N) 24” CONC (S) N/A 987 ft. No debris or sediment observed. Pipes in good condition. #19 24” Storm 24” CONC 1.6% #20 Manhole Type 1 – 48” 24” CONC N/A 1162 ft. No debris or sediment observed. Pipes in good condition. #21 24” Storm Drain 24” CONC 1.6% #22 Catch Basin Type 2 – 54”18” CONC (SE) 24” CONC (S) 30” CONC (NW) 8” CONC (SE) N/A 1337 ft. Locking solid lid. #23 30” Storm Drain 30” CONC Federal Way High School Page 23 Project No. 13003 Springline Design LLC SECTION IV – FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN Flow Control: Flow Control BMPs Per the requirements of Section 5.2 of the 2009 King County Surface Water Design Manual (KCSWDM), the project is required to implement Flow Control BMP’s. In the redeveloped condition the site is classified as Large Lot High Impervious,per Section 5.2.1.2 of the KCSWDM. As such, 100% of targeted surfaces must be served by a Flow Control BMP. Per footnote #3 on page 5-7 of the KCSWDM, the targeted surface for projects on large lots (>22,000 SF) is comprised of all new impervious surfaces. See Figure 9 for a depiction of targeted surfaces, totaling 3.7 acres. Bioretention areas (Rain Gardens) have been implemented in several areas of the site to meet this Flow Control BMP requirement. Surface water runoff which drains to the rain gardens are subsequently be conveyed to the detention pond. Per the credits listed in Table 5.2.2.A of the KCSWDM, impervious surfaces which are served by the rain gardens are modeled as 50% impervious and 50% till grass for design of the formal downstream flow control facility. Formal Flow Control Facility Per the requirements of Section 1.2.3 of the 2009 King County Surface Water Design Manual (KCSWDM) and the City of Federal Way Flow Control Applications Map, the project is required to provide formal flow control facilities that meet the requirements of Flood Problem Flow Control (Level 3 Flow Control). Level 3 flow control is required to mitigate for all new or replaced impervious surfaces. As the project will not be converting any native forested areas to pervious surfaces, all developed pervious areas are non targeted, and these areas will be modeled as pervious in both the predeveloped and developed condition. Level 3 Flow Control:Apply the Level 2 flow control standard,AND match the developed 100-year peak discharge rate to the predeveloped 100-year peak discharge rate. If the Flood Problem Flow Control Area is located within a Conservation Flow Control Area and does not drain entirely by non-erodible manmade conveyance to a major receiving body, then historic site conditions shall be assumed as the predeveloped condition except for the purposes of matching 100-year peak discharge rates. For the purposes of matching 100-year peak discharge rates,existing site conditions may be assumed. Level 2 Flow Control: Match developed discharge durations to predeveloped durations for the range of predeveloped discharge rates from 50% of the 2-year Federal Way High School Page 24 Project No. 13003 Springline Design LLC peak flow up to the full 50-year peak flow. Also match developed peak discharge rates to predeveloped peak discharge rates for the 2- and 10- year return periods. In the developed condition, runoff from flow control targeted surfaces will be collected and conveyed to a detention facility on the west side of the site. Due to the topography of the site, flow control targeted surfaces at the southern margin of the site cannot be reasonably conveyed to the proposed detention facility. In addition, due to space constraints, provision of separate flow control facilities for the ROW’s is not reasonably feasible. Accordingly, per section 1.2.3.2.G of the KCSWDM, a mitigation trade is proposed to provide flow control for these areas, which will bypass the detention facility. In trade for these areas, the proposed onsite storm drainage system will include the collection and conveyance to the detention pond of areas which are not targeted for flow control. However, due to the configuration of the proposed bypass areas and the available areas for mitigation trades, implementation of the trade will result in the provision of mitigation for an additional 0.94 acres of impervious area beyond that which is “targeted” for required mitigation by the proposed redevelopment. In short, the project will be “banking” mitigation in the proposed pond for an additional 0.94 acres of impervious area which may be developed at a later date. See Table 4 below for a summary of the flow control mitigation trade areas. See Figure 8 for a depiction of the mitigation trade areas. Table 4 – Flow Control Mitigation Trade Areas Developed Surface Area (Acres) Non-Target Areas to Flow Control (+) 1.86 Target Areas Bypassing Flow Control (-) 0.92 Net “Additional” Mitigation Trade Area To Flow Control (+) 0.94 Per table 3.2.2.C of the KCSWDM, field areas that include an underdrain collection system (e.g. grass or synthetic turf sports field) are modeled as 75% grass and 25% impervious. Per the credits listed in Table 5.2.2.A of the KCSWDM, impervious surfaces which are served by the rain gardens are modeled as 50% impervious and 50% till grass for design of the formal downstream flow control facility. See Table 5 below for a summary of the targeted areas for flow control. This includes the net “additional” mitigation trade area outlined above. See Figure 5 in Section 1 for a graphic representation of developed land cover. Federal Way High School Page 25 Project No. 13003 Springline Design LLC Table 5 – Targeted Areas Summary Developed Surface Area (Acres) Effective Impervious (Acres) Effective Pervious (Acres) Building 3.05 3.05 --- PGIS with Bioretention (50% Pervious/50% Impervious)4.68 2.34 2.34 Non-PGIS 2.89 2.89 --- Proposed Underdrained Turf (75% Pervious/25% Impervious)5.64 1.41 4.23 Pond (100% Impervious)1.63 1.63 --- Net “Additional” Flow Control Mitigation Trade Area 0.94 0.94 --- Total Target Areas for Flow Control 12.26 6.57 In addition to the targeted areas summarized in Table 5, the developed condition includes 10.25 acres of non-targeted landscape area; this non targeted area will be modeled as till grass in both the predeveloped and developed condition. See Table 6 below for the facility sizing inputs and flow rate comparison based on the above. See Appendix A for KCRTS routing summaries. Table 6 – Detention Facility Sizing Data Impervious (Acres) Till Forest (Acres) Till Grass (Acres) Total Area (Acres) 2-year Peak Discharge Rate (cfs) 10-year Peak Discharge Rate (cfs) 100-year Peak Discharge Rate (cfs) Predeveloped --- 18.83 10.25 29.08 1.03 1.94 9.24* Developed Targeted Areas 12.26 --- 6.57 29.08 0.52 1.28 2.53Developed Non-Targeted Areas --- --- 10.25 * Per KCSWDM,existing site condition used for 100-year pre-developed condition. See Section 1, Table 1. A flow control system consisting of a 250,000 cubic foot detention pond will be constructed to provide Level 3 Flow Control onsite before discharging detained stormwater to the downstream City of Federal Way storm drainage system. S 304th and 308th Streets ROW Flow control for right-of-way improvements are implemented as described in mitigation trade area summarized in Table 4 and facility sizing in Table 6 above. TTTTT Federal Way High School Page 28 Project No. 13003 Springline Design LLC Water Quality General Per the City of Federal Way, this project is required to provide Enhanced Basic water quality treatment for all existing and proposed pollution generation impervious surfaces (PGIS). This requirement is being met through the use of bioretention areas (rain gardens) to filter and treat runoff. Design and sizing of bioretention areas is in accordance with the Department of Ecology Stormwater Management Manual for Western Washington. Bioretention areas are designed with 18” of bioretention material and are underdrained, with a maximum ponding depth of 12” and maximum drawdown time of 24 hours following a storm event. Sizing of the facilities was done with the Western Washington Hydrology Model (WWHM) to filter 91% of the runoff volume, per DOE standards. Site: The proposed improvements result in approximately 7.62 acres of targeted surfaces, comprising new and/or replaced pollution generating impervious surface (PGIS), and landscape areas draining across PGIS. S 304th and 308th Streets ROW The proposed improvements to the right-of-ways will add approximately 0.91 acres of new and replaced PGIS and landscape draining to the ROW. Due to limited space in the 308th ROW, and in order to limit impacts to existing Stadium Parking and Central Kitchen facilities adjacent to that ROW, a single ROW water quality treatment facility is proposed, to be located adjacent to S. 304th St. A catch basin in the S 304th St ROW will collect runoff from the ROW and convey it to a bioretention facility adjacent to the ROW. The bioretention facility will treat an area equivalent to the sum of the target surfaces in the S 304th and S 308th Streets right-of- ways (0.91 acres). Treated runoff from the bioretention facility will then be discharged to the downstream S. 304th ROW drainage system. See Figure 10 for bioretention catchment areas, sizes, and locations. See Appendix A for bioretention sizing calculations. Federal Way High School Page 30 Project No. 13003 Springline Design LLC SECTION V – CONVEYANCE SYSTEM DESIGN AND ANALYSIS The on-site and ROW drainage will be served by a collection and conveyance system consisting of pipes and catch basins. Pipes are sloped at a minimum 0.5% with catch basins at every juncture. For the purposes of design, a backwater analysis was performed on this system. Flows were derived through the rational method for use in the backwater analysis. No overtopping of this system occurs during the 25-year event. The spreadsheet for the pipe flows and layout and 25-year event backwater analysis are included in Appendix C. See Figures 11A – 11C following this section for conveyance system and basin area diagrams. SOUTH308THSTREETESOUTH 16THAVESOUTHPACIFICHIGHWAY99PACIFICHIGHWAY99PACIFICHIGHWAY99TTT SOUTH304THSTREETSOUTH304THSTREETSOUTH304THSTREET16THAVESOUTH13THPLSOUTHT Federal Way High School Page 34 Project No. 13003 Springline Design LLC SECTION VI – SPECIAL REPORTS AND STUDIES A geotechnical report for the site was completed. SECTION VII – OTHER PERMITS Federal Way Public Schools will be filing a Washington State Department of Ecology NPDES Notice of Intent. SECTION VIII – EROSION AND SEDIMENT CONTROL ESC Measures are being addressed as follows: Clearing Limits: Clearing limits are being delineated by perimeter silt fencing and/or chain link fencing. Cover Measures: Temporary cover shall be installed if an area is to remain unworked for more than seven days during the dry season (May 1 to September 30) or for more than two consecutive working days during the wet season (October 1 to April 30). Any area to remain unworked for more than 30 days shall be seeded or sodded, unless the City determines that winter weather makes vegetation establishment infeasible. Perimeter Protection: Perimeter protection will be implemented by silt fencing around the site perimeter where drainage paths require. Traffic Area Stabilization: Stabilized areas will be used for construction traffic. Sediment Retention: The proposed detention pond will be utilized as a sediment pond during construction. See Appendix D for sediment pond sizing. Surface Water Control: Surface water will be collected and conveyed via swales with check dams as necessary. Dust Control: Dust control, if required, will be provided through the limited use of water trucks. Federal Way High School Page 35 Project No. 13003 Springline Design LLC SECTION IX – BOND QUANTITIES A bond quantity worksheet for the proposed site improvements will be completed at a later date. SECTION X – OPERATIONS AND MAINTENANCE MANUAL An operation and maintenance manual is provided in Appendix B, outlining the required regular maintenance necessary for the detention pond and rain gardens to be performed by Federal Way Public Schools for the site improvements. APPENDIX A – FLOW CONTROL AND WATER QUALITY CALCULATIONS FLOW CONTROL SUMMARY OF KCRTS INPUTS EXISTING (HISTORIC) CONDITIONS: (FOR FLOW CONTROL OTHER THAN 100 YEAR PEAK) EXISTING (HISTORIC) CONDITION EXISTING (CURRENT) CONDITIONS: (FOR 100 YEAR PEAK FLOW CONTROL) EXISTING (CURRENT) CONDITION DEVELOPED CONDITIONS: DEVELOPED CONDITION MITIGATED CONDITION (POND OUTFLOW) DETENTION POND (STAGE DISCHARGE STORAGE SETUP): DURATION COMPARISON ANALYSIS WATER QUALITY Federal Way High School Page 1 of 8 Project No. 13003 Springline Design LLC Bioretention/Rain Garden #1 Federal Way High School Page 2 of 8 Project No. 13003 Springline Design LLC Bioretention/Rain Garden #2 Federal Way High School Page 3 of 8 Project No. 13003 Springline Design LLC Bioretention/Rain Garden #3 Federal Way High School Page 4 of 8 Project No. 13003 Springline Design LLC Bioretention/Rain Garden #4 Federal Way High School Page 5 of 8 Project No. 13003 Springline Design LLC Bioretention/Rain Garden #5 Federal Way High School Page 6 of 8 Project No. 13003 Springline Design LLC Bioretention/Rain Garden #6 Federal Way High School Page 7 of 8 Project No. 13003 Springline Design LLC Bioretention/Rain Garden #7 Federal Way High School Page 8 of 8 Project No. 13003 Springline Design LLC Bioretention/Rain Garden #8 APPENDIX B – OPERATIONS AND MAINTENANCE MANUAL APPENDIX C – BACKWATER ANALYSIS CONVEYANCE INPUTS AND LAYOUT DATA Project Name:Federal Way High School Event Parameters:Runoff Coefficients: Job Number:13003 Event PR aR bR Tc iR IR C impervious 0.90 Designed By:MEB in unitless unitless min unitless in/hr C pervious 0.25 25-yr, 24-hr 3.5 2.66 0.65 10 0.60 2.08 100-yr, 24-hr 4.3 2.61 0.63 10 0.61 2.63 CB CB Impervious Pervious Total Total C IR, 25-yr Q25-yr Q25-yr IR,100-yr Q100-yr Q100-yr Length Pipe Size Mannings "n" Mannings "n" Downstream Downstream Upstream Upstream Pipe Downstream Upstream Area Area Area Area Surface Total Surface Total Uniform Flow Backwater Invert Rim Invert Rim Slope sf sf sf ac unitless in/hr cfs cfs in/hr cfs cfs ft in unitless unitless % CB 1.1 CB 1.2 5,000 0 5,000 0.11 0.90 2.08 0.22 2.29 2.63 0.27 6.60 245.0 24 0.014 0.012 429.65 433.35 430.88 439.00 0.50% CB 1.2 CB 1.3 (FCS) 0 0 0 0.00 0.00 2.08 0.00 2.07 2.63 0.00 6.33 8.0 24 0.014 0.012 430.88 439.00 430.92 441.50 0.50% CB 1.3 (FCS)INLET #1 0 77,463 77,463 1.78 0.25 2.08 0.93 2.07 2.63 1.17 6.33 34.0 24 0.014 0.012 431.00 439.00 431.00 440.00 0.00% PIPE OUTLET #2 CB 2.1 0 0 0.00 0.00 2.08 0.00 23.21 2.63 0.00 29.30 53.0 24 0.014 0.012 436.00 439.00 437.90 444.00 3.58% CB 2.1 CB 2.2 0 0 0.00 0.00 2.08 0.00 23.21 2.63 0.00 29.30 129.0 24 0.014 0.012 437.90 444.00 439.93 444.50 1.57% CB 2.2 CB 2.3 0 0 0.00 0.00 2.08 0.00 23.21 2.63 0.00 29.30 131.0 24 0.014 0.012 439.93 444.50 441.96 447.50 1.55% CB 2.3 CB 2.4 0 0 0.00 0.00 2.08 0.00 23.21 2.63 0.00 29.30 63.0 24 0.014 0.012 441.96 447.50 445.23 457.00 5.19% CB 2.4 CB 2.5 0 0 0.00 0.00 2.08 0.00 23.21 2.63 0.00 29.30 151.0 24 0.014 0.012 445.23 457.00 447.50 459.20 1.50% CB 2.5 CB 2.6 10,000 9,525 19,525 0.45 0.58 2.08 0.54 22.50 2.63 0.69 28.40 221.0 24 0.014 0.012 447.50 459.20 450.82 464.05 1.50% CB 2.6 CB 2.7 2,000 17,626 19,626 0.45 0.32 2.08 0.30 6.51 2.63 0.37 8.22 217.0 24 0.014 0.012 450.82 464.05 451.91 461.80 0.50% CB 2.7 CB 2.8 0 0 0.00 0.00 2.08 0.00 2.89 2.63 0.00 3.65 210.0 18 0.014 0.012 452.41 461.80 453.46 458.50 0.50% CB 2.8 CB 2.9 20,000 3,254 23,254 0.53 0.81 2.08 0.90 2.37 2.63 1.14 3.00 106.0 12 0.014 0.012 453.96 458.50 456.32 461.30 2.23% CB 2.9 CB 2.10 7,200 306 7,506 0.17 0.87 2.08 0.31 1.47 2.63 0.40 1.86 125.0 12 0.014 0.012 456.32 461.30 457.74 461.00 1.14% CB 2.10 CB 2.11 11,100 8,535 19,635 0.45 0.62 2.08 0.58 1.16 2.63 0.73 1.46 73.0 8 0.014 0.012 458.07 461.00 458.57 460.60 0.68% CB 2.11 CB 2.12 11,300 7,796 19,096 0.44 0.63 2.08 0.58 0.58 2.63 0.73 0.73 218.0 8 0.014 0.012 458.57 460.60 459.67 464.50 0.50% CB 2.5 CB 22.1 0 5,928 5,928 0.14 0.25 2.08 0.07 0.71 2.63 0.09 0.90 65.0 8 0.014 0.012 448.83 459.20 455.00 458.00 9.49% PIPE OUTLET #3 CB 22.2 11,675 11,690 23,365 0.54 0.57 2.08 0.64 0.64 2.63 0.81 0.81 49.0 8 0.014 0.012 457.00 457.50 457.25 458.15 0.51% CB 2.6 CB 4.1 55,000 1,340 56,340 1.29 0.88 2.08 2.38 5.12 2.63 3.01 6.47 90.0 12 0.014 0.012 450.82 464.05 460.00 463.50 10.20% PIPE OUTLET #4 CB 4.2 19,000 1,590 20,590 0.47 0.85 2.08 0.84 2.29 2.63 1.06 2.89 79.0 12 0.014 0.012 463.00 463.50 465.50 468.20 3.16% CB 4.2 CB 4.3 23,000 1,211 24,211 0.56 0.87 2.08 1.00 1.45 2.63 1.27 1.83 67.0 8 0.014 0.012 465.50 468.20 468.50 471.80 4.48% PIPE OUTLET #5 CB 5.1 10,000 1,485 11,485 0.26 0.82 2.08 0.45 0.45 2.63 0.57 0.57 57.0 8 0.014 0.012 463.00 463.50 463.60 466.50 1.05% CB 2.6 CB 6.1 0 0 0 0.00 0.00 2.08 0.00 10.32 2.63 0.00 13.02 318.0 18 0.014 0.012 450.82 464.05 457.00 465.50 1.94% CB 6.1 CB 6.2 0 0 0 0.00 0.00 2.08 0.00 1.31 2.63 0.00 1.65 292.0 12 0.014 0.012 457.00 465.50 468.00 478.00 3.77% CB 6.2 CB 6.3 0 0 0 0.00 0.00 2.08 0.00 1.31 2.63 0.00 1.65 59.0 12 0.014 0.012 468.00 478.00 472.00 482.10 6.78% CB 6.3 CB 6.4 30,400 0 30,400 0.70 0.90 2.08 1.31 1.31 2.63 1.65 1.65 83.0 8 0.014 0.012 472.00 482.10 480.00 483.00 9.64% CB 6.1 CB 7.1 9,000 3,087 12,087 0.28 0.73 2.08 0.42 1.21 2.63 0.54 1.53 242.0 12 0.014 0.012 457.50 465.50 460.00 465.00 1.03% PIPE OUTLET #9 CB 7.2 17,000 4,791 21,791 0.50 0.76 2.08 0.79 0.79 2.63 1.00 1.00 20.0 8 0.014 0.012 464.00 465.00 464.10 465.70 0.50% CB 6.1 CB 8.1 1,381 0 1,381 0.03 0.90 2.08 0.06 1.52 2.63 0.08 1.92 39.0 8 0.014 0.012 457.00 465.50 462.00 465.50 12.82% CB 8.1 CB 8.2 4,688 0 4,688 0.11 0.90 2.08 0.20 0.77 2.63 0.25 0.98 63.0 8 0.014 0.012 462.00 465.50 462.66 466.50 1.05% CB 8.2 CB 8.3 4,868 0 4,868 0.11 0.90 2.08 0.21 0.57 2.63 0.26 0.72 63.0 8 0.014 0.012 462.66 466.50 463.32 466.50 1.05% CB 8.3 CB 8.4 8,386 0 8,386 0.19 0.90 2.08 0.36 0.36 2.63 0.46 0.46 58.0 8 0.014 0.012 463.32 466.50 463.93 466.80 1.05% CB 8.1 CB 8.5 7,903 0 7,903 0.18 0.90 2.08 0.34 0.69 2.63 0.43 0.87 39.0 8 0.014 0.012 462.00 465.50 462.82 466.50 2.10% CB 8.5 CB 8.6 8,168 0 8,168 0.19 0.90 2.08 0.35 0.35 2.63 0.44 0.44 51.0 8 0.014 0.012 462.82 466.50 463.37 466.50 1.08% CB 6.1 CB 9.1 30,000 24,625 54,625 1.25 0.61 2.08 1.59 6.27 2.63 2.00 7.92 89.0 18 0.014 0.012 457.00 465.50 462.00 465.50 5.62% CB CB Impervious Pervious Total Total C IR, 25-yr Q25-yr Q25-yr IR,100-yr Q100-yr Q100-yr Length Pipe Size Mannings "n" Mannings "n" Downstream Downstream Upstream Upstream Pipe Downstream Upstream Area Area Area Area Surface Total Surface Total Uniform Flow Backwater Invert Rim Invert Rim Slope sf sf sf ac unitless in/hr cfs cfs in/hr cfs cfs ft in unitless unitless % CB 6.2 CB 10.1 0 0 0 0.00 0.00 2.08 0.00 1.25 2.63 0.00 1.58 60.0 8 0.014 0.012 468.00 478.00 469.00 477.00 1.67% CB 10.1 CB 10.2 0 7,450 7,450 0.17 0.25 2.08 0.09 1.25 2.63 0.11 1.58 86.0 8 0.014 0.012 469.00 477.00 470.50 473.50 1.74% CB 10.2 CB 10.3 0 80,000 105,400 2.42 0.19 2.08 0.96 0.96 2.63 1.21 1.21 64.0 8 0.014 0.012 470.50 473.50 471.00 474.00 0.78% PIPE OUTLET #8 CB 10.4 4,850 0 4,850 0.11 0.90 2.08 0.21 0.21 2.63 0.26 0.26 51.0 8 0.014 0.012 475.80 476.50 480.00 484.00 8.24% PIPE OUTLET #6 CB 11.1 12,000 2,566 14,566 0.33 0.79 2.08 0.55 2.57 2.63 0.69 3.24 101.0 12 0.014 0.012 464.00 464.50 465.50 468.80 1.49% CB 11.1 CB 11.2 10,000 2,725 12,725 0.29 0.76 2.08 0.46 2.02 2.63 0.58 2.55 72.0 8 0.014 0.012 465.50 468.80 469.50 472.30 5.56% CB 11.2 CB 11.3 12,000 6,750 18,750 0.43 0.67 2.08 0.60 1.56 2.63 0.75 1.96 70.0 8 0.014 0.012 469.50 472.30 472.50 475.50 4.29% CB 11.3 CB 11.4 0 960 960 0.02 0.25 2.08 0.01 0.96 2.63 0.01 1.21 70.0 8 0.014 0.012 472.50 475.50 476.00 480.50 5.00% CB 11.4 CB 11.5 22,000 0 22,000 0.51 0.90 2.08 0.95 0.95 2.63 1.20 1.20 14.0 8 0.014 0.012 476.00 480.50 476.50 480.00 3.57% PIPE OUTLET #7 CB 12.1 0 0 0 0.00 0.00 2.08 0.00 2.12 2.63 0.00 2.67 42.0 12 0.014 0.012 464.00 464.50 465.00 467.50 2.38% CB 12.1 CB 12.2 49,163 0 49,163 1.13 0.90 2.08 2.12 2.12 2.63 2.67 2.67 120.0 8 0.014 0.012 465.00 467.50 473.50 479.00 7.08% CB 2.7 CB 13.1 2,300 12,700 15,000 0.34 0.35 2.08 0.25 3.32 2.63 0.32 4.19 129.0 12 0.014 0.012 452.91 461.80 456.20 461.20 2.55% CB 13.1 CB 13.2 29,000 13,755 42,755 0.98 0.69 2.08 1.41 3.07 2.63 1.78 3.88 125.0 12 0.014 0.012 456.20 461.20 459.20 464.20 2.40% CB 13.2 CB 13.3 34,000 16,155 50,155 1.15 0.69 2.08 1.66 1.66 2.63 2.09 2.09 109.0 12 0.014 0.012 459.20 464.20 460.29 463.50 1.00% CB 13.3 CB 13.4 45,000 8,302 53,302 1.22 0.80 2.08 2.04 2.04 2.63 2.57 2.57 117.0 12 0.014 0.012 460.29 463.50 462.00 466.00 1.46% PIPE OUTLET #8 CB 21.1 1,382 0 1,382 0.03 0.90 2.08 0.06 0.06 2.63 0.08 0.08 58.0 8 0.014 0.012 452.50 453.50 453.80 456.80 2.24% CB 2.8 CB 17.1 11,516 2,000 13,516 0.31 0.80 2.08 0.52 0.52 2.63 0.66 0.66 77.0 8 0.014 0.012 456.23 458.50 457.00 459.00 1.00% S 308th Street ROW EX CB #1 CB 14.1 964 0 964 0.02 0.90 2.08 0.04 6.01 2.63 0.05 7.59 26.0 30 0.014 0.012 429.00 433.42 429.65 433.35 2.50% CB 14.1 CB 14.2 7,040 0 7,040 0.16 0.90 2.08 0.30 5.97 2.63 0.38 7.53 91.0 24 0.014 0.012 429.65 433.35 430.14 432.68 0.54% CB 14.2 CB 14.3 30,054 0 30,054 0.69 0.90 2.08 1.29 4.02 2.63 1.63 5.07 52.0 18 0.014 0.012 430.14 432.68 430.43 432.47 0.56% CB 14.3 CB 14.4 4,213 0 4,213 0.10 0.90 2.08 0.18 2.72 2.63 0.23 3.43 8.0 18 0.014 0.012 430.43 432.47 430.50 432.41 0.87% CB 14.4 CB 14.5 5,929 0 5,929 0.14 0.90 2.08 0.26 2.54 2.63 0.32 3.21 109.0 12 0.014 0.012 430.50 432.41 432.00 434.72 1.38% CB 14.5 CB 14.6 3,475 0 3,475 0.08 0.90 2.08 0.15 2.28 2.63 0.19 2.88 174.0 12 0.014 0.012 432.00 434.72 441.00 444.72 5.17% CB 14.6 CB 14.7 22,337 0 22,337 0.51 0.90 2.08 0.96 0.96 2.63 1.21 1.21 100.0 12 0.014 0.012 441.00 444.72 447.00 450.85 6.00% CB 14.1 CB 15.1 30,000 30,000 60,000 1.38 0.58 2.08 1.65 1.65 2.63 2.08 2.08 58.0 8 0.014 0.012 430.14 432.68 434.50 437.50 7.52% CB 14.5 CB 16.1 25,100 0 25,100 0.58 0.90 2.08 1.08 1.08 2.63 1.36 1.36 50.0 8 0.014 0.012 441.00 444.72 442.50 445.50 3.00% CB 14.6 CB 16.2 0 2,700 2,700 0.06 0.25 2.08 0.03 0.09 2.63 0.04 0.12 33.0 8 0.014 0.012 447.33 450.85 450.00 454.00 8.09% S 304th Street ROW CB 18.2 CB 18.3 10,667 0 10,667 0.24 0.90 2.08 0.46 1.32 2.63 0.58 1.67 102.0 12 0.014 0.012 444.00 447.39 451.43 456.43 7.28% CB 18.3 CB 18.4 6,861 0 6,861 0.16 0.90 2.08 0.30 0.87 2.63 0.37 1.09 297.0 12 0.014 0.012 451.43 456.43 467.68 472.68 5.47% CB 18.4 CB 18.5 6,694 0 6,694 0.15 0.90 2.08 0.29 0.57 2.63 0.36 0.72 197.0 12 0.014 0.012 467.68 472.68 473.53 478.53 2.97% CB 18.5 CB 18.6 6,537 6,537 0.15 0.90 2.08 0.28 0.28 2.63 0.36 0.36 197.0 12 0.014 0.012 473.53 478.53 478.25 483.26 2.40% CB 18.6 CB 18.7 1,826 0 1,826 0.04 0.90 2.08 0.08 0.08 2.63 0.10 0.10 196.0 12 0.014 0.012 478.25 483.26 480.25 488.25 1.02% CB 18.1 CB 19.1 0 2,933 2,933 0.07 0.25 2.08 0.04 1.36 2.63 0.04 1.72 42.0 8 0.014 0.012 439.30 443.94 441.50 444.50 5.24% PIPE OUTLET #10 CB 18.2 0 0 0 0.00 0.90 2.08 0.00 1.32 2.63 0.00 1.67 27.0 8 0.014 0.012 443.50 444.50 444.00 447.39 1.85% BACKWATER CALCULATION SPREADSHEET - 25 YEAR Project Name:FWHS Designed By:MEB Job Number:13003 Storm Event:25-yr, 24-hr Conveyance System Information Outlet Control Inlet Control Headwater Summation Overtopping Check Pipe Segment Surface Total Length Pipe "n" Down- Down- Up- Up- Pipe Barrel Barrel Critical TW TW Barrel Friction Entrance Entrance Entrance Exit Outlet Inlet Inlet Control Approach Bend Bend Q1 Q3 V1 Junction Head HW (HW - Rim) Over- CB/MH # CB/MH # Flow Flow L Size value Stream Stream Stream Stream Slope Velocity Velocity Depth Elev. Check Hyd. Loss HGL Ke Head Head Control Control Control HW Veloctiy Kb Head Head Loss Elev. Clearance topping Down Up Q Qtot D Invert Rim Invert Rim Head Rad.Elev.Loss Loss Elev.HW/D Elev.Elev.Head Loss Loss Total Check CFS CFS FT IN FT FT FT FT % FPS FT FT FT FT FT FT FT FT FT FT FT FT FT FT FT CFS CFS FPS FT FT FT FT CB 1.1 CB 1.2 0.22 2.29 245.0 24 0.012 429.65 433.35 430.88 439.00 0.50% 0.73 0.01 1.80 432.14 432.14 0.50 0.02 432.88 0.50 0.00 0.01 432.89 0.50 431.88 432.89 0.01 0.64 0.01 2.07 0.73 0.01 432.89 -6.11 Okay CB 1.2 CB 1.3 (FCS) 0.00 2.07 8.0 24 0.012 430.88 439.00 430.92 441.50 0.50% 0.66 0.01 1.80 432.89 432.89 0.50 0.00 432.92 0.50 0.00 0.01 432.93 0.50 431.92 432.93 0.01 1.32 0.01 2.07 0.66 0.01 432.93 -8.57 Okay CB 1.3 (FCS) INLET #1 0.93 2.07 34.0 24 0.012 431.00 439.00 431.00 440.00 0.00% 0.66 0.01 1.80 432.93 432.93 0.50 0.00 433.00 0.50 0.00 0.01 433.01 1.10 433.20 433.20 0.00 0.00 23.21 0.66 433.20 -6.80 Okay PIPE OUTLET #2 CB 2.1 0.00 23.21 53.0 24 0.012 436.00 439.00 437.90 444.00 3.58% 7.39 0.85 1.75 431.00 437.88 0.50 0.47 439.90 0.50 0.42 0.85 441.17 1.80 441.50 441.50 0.85 0.12 0.10 23.21 7.39 0.10 440.75 -3.25 Okay CB 2.1 CB 2.2 0.00 23.21 129.0 24 0.012 437.90 444.00 439.93 444.50 1.57% 7.39 0.85 1.75 440.75 440.75 0.50 1.15 441.93 0.50 0.42 0.85 443.20 1.80 443.53 443.53 0.85 0.48 0.41 23.21 7.39 0.41 443.09 -1.41 Okay CB 2.2 CB 2.3 0.00 23.21 131.0 24 0.012 439.93 444.50 441.96 447.50 1.55% 7.39 0.85 1.75 443.09 443.09 0.50 1.17 444.26 0.50 0.42 0.85 445.53 1.80 445.56 445.56 0.85 0.00 23.21 7.39 444.71 -2.79 Okay CB 2.3 CB 2.4 0.00 23.21 63.0 24 0.012 441.96 447.50 445.23 457.00 5.19% 7.39 0.85 1.75 444.71 444.71 0.50 0.56 447.23 0.50 0.42 0.85 448.50 1.80 448.83 448.83 0.85 0.00 23.21 7.39 447.98 -9.02 Okay CB 2.4 CB 2.5 0.00 23.21 151.0 24 0.012 445.23 457.00 447.50 459.20 1.50% 7.39 0.85 1.75 447.98 447.98 0.50 1.35 449.50 0.50 0.42 0.85 450.77 1.80 451.10 451.10 0.80 1.32 1.12 22.50 0.71 7.39 0.02 1.14 451.44 -7.76 Okay CB 2.5 CB 2.6 0.54 22.50 221.0 24 0.012 447.50 459.20 450.82 464.05 1.50% 7.16 0.80 1.75 451.44 451.44 0.50 1.86 453.30 0.50 0.40 0.80 454.50 1.80 454.42 454.50 0.07 0.00 6.51 15.44 7.16 0.71 0.71 455.14 -8.91 Okay CB 2.6 CB 2.7 0.30 6.51 217.0 24 0.012 450.82 464.05 451.91 461.80 0.50% 2.07 0.07 1.12 455.14 455.14 0.50 0.15 455.29 0.50 0.03 0.07 455.39 0.75 453.41 455.39 0.04 0.00 2.89 3.32 2.07 0.04 0.04 455.39 -6.41 Okay CB 2.7 CB 2.8 0.00 2.89 210.0 18 0.012 452.41 461.80 453.46 458.50 0.50% 1.64 0.04 0.74 455.39 455.39 0.38 0.14 455.52 0.50 0.02 0.04 455.58 0.60 454.36 455.58 0.14 1.32 0.05 2.37 0.52 1.64 0.01 0.06 455.50 -3.00 Okay CB 2.8 CB 2.9 0.90 2.37 106.0 12 0.012 453.96 458.50 456.32 461.30 2.23% 3.02 0.14 0.65 455.50 455.50 0.25 0.40 457.32 0.50 0.07 0.14 457.53 0.75 457.07 457.53 0.05 1.32 0.19 1.47 3.02 0.19 457.67 -3.63 Okay CB 2.9 CB 2.10 0.31 1.47 125.0 12 0.012 456.32 461.30 457.74 461.00 1.14% 1.88 0.05 0.57 457.67 457.67 0.25 0.18 458.74 0.50 0.03 0.05 458.82 0.65 458.39 458.82 0.17 0.48 0.03 1.16 1.88 0.03 458.68 -2.32 Okay CB 2.10 CB 2.11 0.58 1.16 73.0 8 0.012 458.07 461.00 458.57 460.60 0.68% 3.32 0.17 0.52 458.68 458.68 0.17 0.57 459.25 0.50 0.09 0.17 459.50 0.50 458.90 459.50 0.04 0.48 0.08 0.58 3.32 0.08 459.54 -1.06 Okay CB 2.11 CB 2.12 0.58 0.58 218.0 8 0.012 458.57 460.60 459.67 464.50 0.50% 1.66 0.04 0.36 459.54 459.54 0.17 0.42 460.34 0.50 0.02 0.04 460.40 0.50 460.00 460.40 0.00 0.00 1.66 460.40 -4.10 Okay CB 2.5 CB 22.1 0.07 0.71 65.0 8 0.012 448.83 459.20 455.00 458.00 9.49% 2.04 0.06 0.40 451.44 451.44 0.17 0.19 455.67 0.50 0.03 0.06 455.76 0.50 455.33 455.76 0.05 1.32 0.09 0.64 2.04 0.09 455.80 -2.20 Okay PIPE OUTLET #3 CB 22.2 0.64 0.64 49.0 8 0.012 457.00 457.50 457.25 458.15 0.51% 1.84 0.05 0.38 457.50 457.52 0.17 0.12 457.92 0.50 0.03 0.05 458.00 0.50 457.58 458.00 0.00 0.00 1.84 458.00 -0.15 Caution CB 2.6 CB 4.1 2.38 5.12 90.0 12 0.012 450.82 464.05 460.00 463.50 10.20% 6.52 0.66 0.66 455.14 455.14 0.25 1.58 461.00 0.50 0.33 0.66 461.99 0.50 460.50 461.99 0.13 1.32 0.87 2.29 6.52 0.87 462.73 -0.77 Okay PIPE OUTLET #4 CB 4.2 0.84 2.29 79.0 12 0.012 463.00 463.50 465.50 468.20 3.16% 2.92 0.13 0.64 462.73 463.82 0.25 0.28 466.50 0.50 0.07 0.13 466.70 0.50 466.00 466.70 0.27 0.00 1.45 2.92 466.43 -1.77 Okay CB 4.2 CB 4.3 1.00 1.45 67.0 8 0.012 465.50 468.20 468.50 471.80 4.48% 4.16 0.27 0.56 466.43 466.43 0.17 0.82 469.17 0.50 0.13 0.27 469.57 0.50 468.83 469.57 0.03 0.00 0.45 4.16 469.54 -2.26 Okay PIPE OUTLET #5 CB 5.1 0.45 0.45 57.0 8 0.012 463.00 463.50 463.60 466.50 1.05% 1.28 0.03 0.31 463.50 463.50 0.17 0.07 464.27 0.50 0.01 0.03 464.31 0.50 463.93 464.31 0.00 0.00 1.28 464.31 -2.19 Okay CB 2.6 CB 6.1 0.00 10.32 318.0 18 0.012 450.82 464.05 457.00 465.50 1.94% 5.84 0.53 1.23 455.14 455.14 0.38 2.60 458.50 0.50 0.26 0.53 459.29 0.50 457.75 459.29 0.04 1.32 0.70 1.31 9.01 5.84 0.66 1.36 460.61 -4.89 Okay CB 6.1 CB 6.2 0.00 1.31 292.0 12 0.012 457.00 465.50 468.00 478.00 3.77% 1.67 0.04 0.48 460.61 460.61 0.25 0.33 469.00 0.50 0.02 0.04 469.06 0.50 468.50 469.06 0.04 0.48 0.02 1.31 1.25 1.67 0.02 0.04 469.07 -8.93 Okay CB 6.2 CB 6.3 0.00 1.31 59.0 12 0.012 468.00 478.00 472.00 482.10 6.78% 1.67 0.04 0.48 469.07 469.07 0.25 0.07 473.00 0.50 0.02 0.04 473.06 0.50 472.50 473.06 0.22 0.00 1.31 1.67 472.85 -9.25 Okay CB 6.3 CB 6.4 1.31 1.31 83.0 8 0.012 472.00 482.10 480.00 483.00 9.64% 3.75 0.22 0.54 472.85 472.85 0.17 0.82 480.67 0.50 0.11 0.22 480.99 0.50 480.33 480.99 0.00 0.00 3.75 480.99 -2.01 Okay CB 6.1 CB 7.1 0.42 1.21 242.0 12 0.012 457.50 465.50 460.00 465.00 1.03% 1.55 0.04 0.46 460.61 460.61 0.25 0.24 461.00 0.50 0.02 0.04 461.06 0.50 460.50 461.06 0.08 0.00 0.79 1.55 460.98 -4.02 Okay PIPE OUTLET #9 CB 7.2 0.79 0.79 20.0 8 0.012 464.00 465.00 464.10 465.70 0.50% 2.26 0.08 0.42 460.98 464.54 0.17 0.07 464.77 0.50 0.04 0.08 464.89 0.50 464.43 464.89 0.00 0.00 2.26 464.89 -0.81 Okay CB 6.1 CB 8.1 0.06 1.52 39.0 8 0.012 457.00 465.50 462.00 465.50 12.82% 4.37 0.30 0.58 460.61 460.61 0.17 0.53 462.67 0.50 0.15 0.30 463.11 0.50 462.33 463.11 0.08 1.32 0.39 0.77 0.69 4.37 0.15 0.54 463.58 -1.92 Okay CB 8.1 CB 8.2 0.20 0.77 63.0 8 0.012 462.00 465.50 462.66 466.50 1.05% 2.21 0.08 0.42 463.58 463.58 0.17 0.22 463.80 0.50 0.04 0.08 463.91 0.50 462.99 463.91 0.04 1.32 0.10 0.57 2.21 0.10 463.97 -2.53 Okay CB 8.2 CB 8.3 0.21 0.57 63.0 8 0.012 462.66 466.50 463.32 466.50 1.05% 1.64 0.04 0.36 463.97 463.97 0.17 0.12 464.09 0.50 0.02 0.04 464.15 0.50 463.65 464.15 0.02 0.00 0.36 1.64 464.13 -2.37 Okay CB 8.3 CB 8.4 0.36 0.36 58.0 8 0.012 463.32 466.50 463.93 466.80 1.05% 1.03 0.02 0.28 464.13 464.13 0.17 0.04 464.60 0.50 0.01 0.02 464.62 0.50 464.26 464.62 0.06 0.00 0.69 1.03 464.56 -2.24 Okay CB 8.1 CB 8.5 0.34 0.69 39.0 8 0.012 462.00 465.50 462.82 466.50 2.10% 1.98 0.06 0.39 464.56 464.56 0.17 0.11 464.67 0.50 0.03 0.06 464.76 0.50 463.15 464.76 0.02 0.48 0.03 0.35 1.98 0.03 464.77 -1.73 Okay CB 8.5 CB 8.6 0.35 0.35 51.0 8 0.012 462.82 466.50 463.37 466.50 1.08% 1.01 0.02 0.27 464.77 464.77 0.17 0.04 464.81 0.50 0.01 0.02 464.83 0.50 463.70 464.83 1.32 0.02 0.00 1.01 0.02 464.85 -1.65 Okay CB 6.1 CB 9.1 1.59 6.27 89.0 18 0.012 457.00 465.50 462.00 465.50 5.62% 3.55 0.20 0.96 460.61 460.61 0.38 0.27 463.50 0.50 0.10 0.20 463.79 0.50 462.75 463.79 0.00 0.00 3.55 463.79 -1.71 Okay CB 6.2 CB 10.1 0.00 1.25 60.0 8 0.012 468.00 478.00 469.00 477.00 1.67% 3.60 0.20 0.53 455.14 468.60 0.17 0.55 469.67 0.50 0.10 0.20 469.97 0.50 469.33 469.97 0.20 0.48 0.10 1.25 3.60 0.10 469.86 -7.14 Okay CB 10.1 CB 10.2 0.09 1.25 86.0 8 0.012 469.00 477.00 470.50 473.50 1.74% 3.60 0.20 0.53 469.86 469.86 0.17 0.78 471.17 0.50 0.10 0.20 471.47 0.50 470.83 471.47 0.12 0.48 0.10 0.96 3.60 0.10 471.45 -2.05 Okay CB 10.2 CB 10.3 0.96 0.96 64.0 8 0.012 470.50 473.50 471.00 474.00 0.78% 2.74 0.12 0.46 471.45 471.45 0.17 0.34 471.79 0.50 0.06 0.12 471.96 0.50 471.33 471.96 0.01 0.00 0.21 2.74 471.96 -2.04 Okay PIPE OUTLET #8 CB 10.4 0.21 0.21 51.0 8 0.012 475.80 476.50 480.00 484.00 8.24% 0.60 0.01 0.21 471.96 476.24 0.17 0.01 480.67 0.50 0.00 0.01 480.68 0.50 480.33 480.68 0.00 0.00 0.60 480.68 -3.32 Okay PIPE OUTLET #6 CB 11.1 0.55 2.57 101.0 12 0.012 464.00 464.50 465.50 468.80 1.49% 3.27 0.17 0.68 464.50 464.84 0.25 0.44 466.50 0.50 0.08 0.17 466.75 0.50 466.00 466.75 0.52 0.48 0.08 2.02 3.27 0.08 466.31 -2.49 Okay CB 11.1 CB 11.2 0.46 2.02 72.0 8 0.012 465.50 468.80 469.50 472.30 5.56% 5.79 0.52 0.63 466.31 466.31 0.17 1.70 470.17 0.50 0.26 0.52 470.95 0.50 469.83 470.95 0.31 0.00 1.56 5.79 470.64 -1.66 Okay CB 11.2 CB 11.3 0.60 1.56 70.0 8 0.012 469.50 472.30 472.50 475.50 4.29% 4.46 0.31 0.56 470.64 470.64 0.17 0.98 473.17 0.50 0.15 0.31 473.63 0.50 472.83 473.63 0.12 0.00 0.96 4.46 473.51 -1.99 Okay CB 11.3 CB 11.4 0.01 0.96 70.0 8 0.012 472.50 475.50 476.00 480.50 5.00% 2.75 0.12 0.41 473.51 473.51 0.17 0.37 476.67 0.50 0.06 0.12 476.84 0.50 476.33 476.84 0.11 0.00 0.95 2.75 476.73 -3.77 Okay CB 11.4 CB 11.5 0.95 0.95 14.0 8 0.012 476.00 480.50 476.50 480.00 3.57% 2.71 0.11 0.40 476.73 476.73 0.17 0.07 477.17 0.50 0.06 0.11 477.34 0.50 476.83 477.34 1.32 0.15 0.00 2.71 0.15 477.49 -2.51 Okay PIPE OUTLET #7 CB 12.1 0.00 2.12 42.0 12 0.012 464.00 464.50 465.00 467.50 2.38% 2.70 0.11 0.33 464.50 464.67 0.25 0.13 466.00 0.50 0.06 0.11 466.17 0.50 465.50 466.17 0.57 0.48 0.05 2.12 2.70 0.05 465.65 -1.85 Okay FWHS - Backwater Conveyance Calculation-Ph2 Permit.xls 7/30/2014 Conveyance System Information Outlet Control Inlet Control Headwater Summation Overtopping Check Pipe Segment Surface Total Length Pipe "n" Down- Down- Up- Up- Pipe Barrel Barrel Critical TW TW Barrel Friction Entrance Entrance Entrance Exit Outlet Inlet Inlet Control Approach Bend Bend Q1 Q3 V1 Junction Head HW (HW - Rim) Over- CB/MH # CB/MH # Flow Flow L Size value Stream Stream Stream Stream Slope Velocity Velocity Depth Elev. Check Hyd. Loss HGL Ke Head Head Control Control Control HW Veloctiy Kb Head Head Loss Elev. Clearance topping Down Up Q Qtot D Invert Rim Invert Rim Head Rad.Elev.Loss Loss Elev.HW/D Elev.Elev.Head Loss Loss Total Check CFS CFS FT IN FT FT FT FT % FPS FT FT FT FT FT FT FT FT FT FT FT FT FT FT FT CFS CFS FPS FT FT FT FT CB 12.1 CB 12.2 2.12 2.12 120.0 8 0.012 465.00 467.50 473.50 479.00 7.08% 6.07 0.57 0.33 465.65 465.65 0.17 3.12 474.17 0.50 0.29 0.57 475.02 0.50 473.83 475.02 1.32 0.75 0.00 6.07 0.75 475.78 -3.22 Okay CB 2.7 CB 13.1 0.25 3.32 129.0 12 0.012 452.91 461.80 456.20 461.20 2.55% 4.23 0.28 0.33 455.39 455.39 0.25 0.95 457.20 0.50 0.14 0.28 457.62 0.50 456.70 457.62 0.24 1.32 0.37 3.07 4.23 0.37 457.75 -3.45 Okay CB 13.1 CB 13.2 1.41 3.07 125.0 12 0.012 456.20 461.20 459.20 464.20 2.40% 3.91 0.24 0.33 457.75 457.75 0.25 0.79 460.20 0.50 0.12 0.24 460.56 0.50 459.70 460.56 0.07 0.00 1.66 3.91 460.49 -3.71 Okay CB 13.2 CB 13.3 1.66 1.66 109.0 12 0.012 459.20 464.20 460.29 463.50 1.00% 2.11 0.07 0.33 460.49 460.49 0.25 0.20 461.29 0.50 0.03 0.07 461.39 0.50 460.79 461.39 0.00 0.00 2.11 461.39 -2.11 Okay CB 13.3 CB 13.4 2.04 2.04 117.0 12 0.012 460.29 463.50 462.00 466.00 1.46% 2.59 0.10 0.33 461.39 461.39 0.25 0.32 463.00 0.50 0.05 0.10 463.16 0.50 462.50 463.16 0.00 0.00 0.06 2.59 463.16 -2.84 Okay PIPE OUTLET #8 CB 21.1 0.06 0.06 58.0 8 0.012 452.50 453.50 453.80 456.80 2.24% 0.17 0.00 0.33 452.50 453.00 0.17 0.00 454.47 0.50 0.00 0.00 454.47 0.50 454.13 454.47 0.00 0.00 0.17 454.47 -2.33 Okay CB 2.8 CB 17.1 0.52 0.52 77.0 8 0.012 456.23 458.50 457.00 459.00 1.00% 1.49 0.03 0.33 455.50 456.73 0.17 0.12 457.67 0.50 0.02 0.03 457.72 0.50 457.33 457.72 1.32 0.05 0.00 1.49 0.05 457.76 -1.24 Okay S 308th Street ROW EX CB #1 CB 14.1 0.04 6.01 26.0 30 0.012 429.00 433.42 429.65 433.35 2.50% 1.22 0.02 0.94 429.50 430.72 0.63 0.00 432.15 0.50 0.01 0.02 432.18 0.50 430.90 432.18 0.06 0.00 5.97 2.29 1.22 0.01 0.01 432.14 -1.21 Okay CB 14.1 CB 14.2 0.30 5.97 91.0 24 0.012 429.65 433.35 430.14 432.68 0.54% 1.90 0.06 0.94 432.14 432.14 0.50 0.05 432.19 0.50 0.03 0.06 432.27 0.50 431.14 432.27 0.08 0.00 4.02 1.65 1.90 0.02 0.02 432.21 -0.47 Caution CB 14.2 CB 14.3 1.29 4.02 52.0 18 0.012 430.14 432.68 430.43 432.47 0.56% 2.27 0.08 0.86 432.21 432.21 0.38 0.06 432.27 0.50 0.04 0.08 432.39 0.50 431.18 432.39 0.04 0.00 2.72 2.27 432.36 -0.11 Caution CB 14.3 CB 14.4 0.18 2.72 8.0 18 0.012 430.43 432.47 430.50 432.41 0.87% 1.54 0.04 0.75 432.36 432.36 0.38 0.00 432.36 0.50 0.02 0.04 432.42 0.50 431.25 432.42 0.16 0.00 2.54 1.54 432.25 -0.16 Caution CB 14.4 CB 14.5 0.26 2.54 109.0 12 0.012 430.50 432.41 432.00 434.72 1.38% 3.23 0.16 0.82 432.25 432.25 0.25 0.47 433.00 0.50 0.08 0.16 433.24 0.50 432.50 433.24 0.13 0.00 2.28 3.23 433.11 -1.61 Okay CB 14.5 CB 14.6 0.15 2.28 174.0 12 0.012 432.00 434.72 441.00 444.72 5.17% 2.91 0.13 0.79 433.11 433.11 0.25 0.61 442.00 0.50 0.07 0.13 442.20 0.50 441.50 442.20 0.02 0.00 0.96 1.17 2.91 0.08 0.08 442.26 -2.46 Okay CB 14.6 CB 14.7 0.96 0.96 100.0 12 0.012 441.00 444.72 447.00 450.85 6.00% 1.22 0.02 0.41 442.26 442.26 0.25 0.06 448.00 0.50 0.01 0.02 448.03 0.50 447.50 448.03 0.00 0.96 1.22 448.03 -2.82 Okay CB 14.1 CB 15.1 1.65 1.65 58.0 8 0.012 430.14 432.68 434.50 437.50 7.52% 4.73 0.35 0.62 432.21 432.21 0.17 0.92 435.17 0.50 0.17 0.35 435.69 0.50 434.83 435.69 1.32 0.46 0.00 4.73 0.46 436.15 -1.35 Okay CB 14.5 CB 16.1 1.08 1.08 50.0 8 0.012 441.00 444.72 442.50 445.50 3.00% 3.10 0.15 0.49 442.26 442.26 0.17 0.34 443.17 0.50 0.07 0.15 443.39 0.50 442.83 443.39 0.00 1.32 0.20 0.00 3.10 0.20 443.59 -1.91 Okay CB 14.6 CB 16.2 0.03 0.09 33.0 8 0.012 447.33 450.85 450.00 454.00 8.09% 0.26 0.00 0.52 442.26 447.92 0.17 0.00 450.67 0.50 0.00 0.00 450.67 0.50 450.33 450.67 1.32 0.00 0.00 0.26 0.00 450.67 -3.33 Okay S 304th Street ROW CB 18.2 CB 18.3 0.46 1.32 102.0 12 0.012 444.00 447.39 451.43 456.43 7.28% 1.69 0.04 0.33 445.00 445.00 0.25 0.12 452.43 0.50 0.02 0.04 452.50 0.50 451.93 452.50 0.01 0.00 0.87 1.69 452.49 -3.94 Okay CB 18.3 CB 18.4 0.30 0.87 297.0 12 0.012 451.43 456.43 467.68 472.68 5.47% 1.10 0.02 0.33 452.49 452.49 0.25 0.15 468.68 0.50 0.01 0.02 468.71 0.50 468.18 468.71 0.00 0.00 0.57 1.10 468.71 -3.97 Okay CB 18.4 CB 18.5 0.29 0.57 197.0 12 0.012 467.68 472.68 473.53 478.53 2.97% 0.73 0.01 0.33 468.71 468.71 0.25 0.04 474.53 0.50 0.00 0.01 474.54 0.50 474.03 474.54 0.00 0.00 0.28 0.73 474.54 -3.99 Okay CB 18.5 CB 18.6 0.28 0.28 197.0 12 0.012 473.53 478.53 478.25 483.26 2.40% 0.36 0.00 0.33 474.54 474.54 0.25 0.01 479.25 0.50 0.00 0.00 479.25 0.50 478.75 479.25 0.00 0.08 0.36 479.25 -4.01 Okay CB 18.6 CB 18.7 0.08 0.08 196.0 12 0.012 478.25 483.26 480.25 488.25 1.02% 0.10 0.00 0.33 479.25 479.25 0.25 0.00 481.25 0.50 0.00 0.00 481.25 0.50 480.75 481.25 0.00 0.00 0.10 481.25 -7.00 Okay CB 18.1 CB 19.1 0.04 1.36 42.0 8 0.012 439.30 443.94 441.50 444.50 5.24% 3.90 0.24 0.33 439.30 439.80 0.17 0.45 442.17 0.50 0.12 0.24 442.52 0.50 441.83 442.52 0.00 0.00 3.90 442.52 -1.98 Okay PIPE OUTLET #10 CB 18.2 0.00 1.32 27.0 8 0.012 443.50 444.50 444.00 447.39 1.85% 3.79 0.22 0.33 444.00 444.00 0.17 0.27 444.67 0.50 0.11 0.22 445.00 0.50 444.33 445.00 0.00 0.00 3.79 445.00 -2.39 Okay FWHS - Backwater Conveyance Calculation-Ph2 Permit.xls 7/30/2014 BACKWATER CALCULATION SPREADSHEET - 100 YEAR Project Name:FWHS Designed By:MEB Job Number:13003 Storm Event:100-yr, 24-hr Conveyance System Information Outlet Control Inlet Control Headwater Summation Overtopping Check Pipe Segment Surface Total Length Pipe "n" Down- Down- Up- Up- Pipe Barrel Barrel Critical TW TW Barrel Friction Entrance Entrance Entrance Exit Outlet Inlet Inlet Control Approach Bend Bend Q1 Q3 V1 Junction Head HW (HW - Rim) Over- CB/MH # CB/MH # Flow Flow L Size value Stream Stream Stream Stream Slope Velocity Velocity Depth Elev. Check Hyd. Loss HGL Ke Head Head Control Control Control HW Veloctiy Kb Head Head Loss Elev. Clearance topping Down Up Q Qtot D Invert Rim Invert Rim Head Rad.Elev.Loss Loss Elev.HW/D Elev.Elev.Head Loss Loss Total Check CFS CFS FT IN FT FT FT FT % FPS FT FT FT FT FT FT FT FT FT FT FT FT FT FT FT CFS CFS FPS FT FT FT FT CB 1.1 CB 1.2 0.27 6.60 245.0 24 0.012 429.65 433.35 430.88 439.00 0.50% 2.10 0.07 1.80 432.14 432.14 0.50 0.18 432.88 0.50 0.03 0.07 432.98 0.50 431.88 432.98 0.06 0.64 0.04 6.33 2.10 0.04 432.96 -6.04 Okay CB 1.2 CB 1.3 (FCS) 0.00 6.33 8.0 24 0.012 430.88 439.00 430.92 441.50 0.50% 2.01 0.06 1.80 432.96 432.96 0.50 0.01 432.97 0.50 0.03 0.06 433.06 0.50 431.92 433.06 0.06 1.32 0.08 6.33 2.01 0.08 433.08 -8.42 Okay CB 1.3 (FCS) INLET #1 1.17 6.33 34.0 24 0.012 431.00 439.00 431.00 440.00 0.00% 2.01 0.06 1.80 433.08 433.08 0.50 0.02 433.11 0.50 0.03 0.06 433.20 1.10 433.20 433.20 0.00 0.00 29.30 2.01 433.20 -6.80 Okay PIPE OUTLET #2 CB 2.1 0.00 29.30 53.0 24 0.012 436.00 439.00 437.90 444.00 3.58% 9.33 1.35 1.75 431.00 437.88 0.50 0.76 439.90 0.50 0.68 1.35 441.93 1.80 441.50 441.93 1.35 0.12 0.16 29.30 9.33 0.16 440.74 -3.26 Okay CB 2.1 CB 2.2 0.00 29.30 129.0 24 0.012 437.90 444.00 439.93 444.50 1.57% 9.33 1.35 1.75 440.74 440.74 0.50 1.84 442.58 0.50 0.68 1.35 444.60 1.80 443.53 444.60 1.35 0.48 0.65 29.30 9.33 0.65 443.90 -0.60 Okay CB 2.2 CB 2.3 0.00 29.30 131.0 24 0.012 439.93 444.50 441.96 447.50 1.55% 9.33 1.35 1.75 443.90 443.90 0.50 1.87 445.77 0.50 0.68 1.35 447.79 1.80 445.56 447.79 1.35 0.00 29.30 9.33 446.44 -1.06 Okay CB 2.3 CB 2.4 0.00 29.30 63.0 24 0.012 441.96 447.50 445.23 457.00 5.19% 9.33 1.35 1.75 446.44 446.44 0.50 0.90 447.34 0.50 0.68 1.35 449.36 1.80 448.83 449.36 1.35 0.00 29.30 9.33 448.01 -8.99 Okay CB 2.4 CB 2.5 0.00 29.30 151.0 24 0.012 445.23 457.00 447.50 459.20 1.50% 9.33 1.35 1.75 448.01 448.01 0.50 2.15 450.17 0.50 0.68 1.35 452.19 1.80 451.10 452.19 1.27 1.32 1.78 28.40 0.90 9.33 0.04 1.82 452.74 -6.46 Okay CB 2.5 CB 2.6 0.69 28.40 221.0 24 0.012 447.50 459.20 450.82 464.05 1.50% 9.04 1.27 1.75 452.74 452.74 0.50 2.96 455.70 0.50 0.63 1.27 457.60 1.80 454.42 457.60 0.11 0.00 8.22 19.49 9.04 1.13 1.13 458.62 -5.43 Okay CB 2.6 CB 2.7 0.37 8.22 217.0 24 0.012 450.82 464.05 451.91 461.80 0.50% 2.62 0.11 1.12 458.62 458.62 0.50 0.24 458.87 0.50 0.05 0.11 459.02 0.75 453.41 459.02 0.07 0.00 3.65 4.19 2.62 0.06 0.06 459.02 -2.78 Okay CB 2.7 CB 2.8 0.00 3.65 210.0 18 0.012 452.41 461.80 453.46 458.50 0.50% 2.07 0.07 0.74 459.02 459.02 0.38 0.22 459.24 0.50 0.03 0.07 459.34 0.60 454.36 459.34 0.23 1.32 0.09 3.00 0.66 2.07 0.01 0.10 459.21 0.71 Overtopping!! CB 2.8 CB 2.9 1.14 3.00 106.0 12 0.012 453.96 458.50 456.32 461.30 2.23% 3.82 0.23 0.65 459.21 459.21 0.25 0.64 459.85 0.50 0.11 0.23 460.18 0.75 457.07 460.18 0.09 1.32 0.30 1.86 3.82 0.30 460.40 -0.90 Okay CB 2.9 CB 2.10 0.40 1.86 125.0 12 0.012 456.32 461.30 457.74 461.00 1.14% 2.37 0.09 0.57 460.40 460.40 0.25 0.29 460.68 0.50 0.04 0.09 460.82 0.65 458.39 460.82 0.27 0.48 0.04 1.46 2.37 0.04 460.58 -0.42 Caution CB 2.10 CB 2.11 0.73 1.46 73.0 8 0.012 458.07 461.00 458.57 460.60 0.68% 4.19 0.27 0.52 460.58 460.58 0.17 0.91 461.49 0.50 0.14 0.27 461.90 0.50 458.90 461.90 0.07 0.48 0.13 0.73 4.19 0.13 461.96 1.36 Overtopping!! CB 2.11 CB 2.12 0.73 0.73 218.0 8 0.012 458.57 460.60 459.67 464.50 0.50% 2.10 0.07 0.36 461.96 461.96 0.17 0.68 462.64 0.50 0.03 0.07 462.74 0.50 460.00 462.74 0.00 0.00 2.10 462.74 -1.76 Okay CB 2.5 CB 22.1 0.09 0.90 65.0 8 0.012 448.83 459.20 455.00 458.00 9.49% 2.58 0.10 0.40 452.74 452.74 0.17 0.31 455.67 0.50 0.05 0.10 455.82 0.50 455.33 455.82 0.08 1.32 0.14 0.81 2.58 0.14 455.87 -2.13 Okay PIPE OUTLET #3 CB 22.2 0.81 0.81 49.0 8 0.012 457.00 457.50 457.25 458.15 0.51% 2.32 0.08 0.38 457.50 457.52 0.17 0.19 457.92 0.50 0.04 0.08 458.04 0.50 457.58 458.04 0.00 0.00 2.32 458.04 -0.11 Caution CB 2.6 CB 4.1 3.01 6.47 90.0 12 0.012 450.82 464.05 460.00 463.50 10.20% 8.23 1.05 0.66 458.62 458.62 0.25 2.51 461.13 0.50 0.53 1.05 462.71 0.50 460.50 462.71 0.21 1.32 1.39 2.89 8.23 1.39 463.89 0.39 Overtopping!! PIPE OUTLET #4 CB 4.2 1.06 2.89 79.0 12 0.012 463.00 463.50 465.50 468.20 3.16% 3.68 0.21 0.64 463.89 463.89 0.25 0.44 466.50 0.50 0.11 0.21 466.82 0.50 466.00 466.82 0.43 0.00 1.83 3.68 466.39 -1.81 Okay CB 4.2 CB 4.3 1.27 1.83 67.0 8 0.012 465.50 468.20 468.50 471.80 4.48% 5.26 0.43 0.56 466.39 466.39 0.17 1.31 469.17 0.50 0.21 0.43 469.81 0.50 468.83 469.81 0.04 0.00 0.57 5.26 469.77 -2.03 Okay PIPE OUTLET #5 CB 5.1 0.57 0.57 57.0 8 0.012 463.00 463.50 463.60 466.50 1.05% 1.62 0.04 0.31 463.50 463.50 0.17 0.11 464.27 0.50 0.02 0.04 464.33 0.50 463.93 464.33 0.00 0.00 1.62 464.33 -2.17 Okay CB 2.6 CB 6.1 0.00 13.02 318.0 18 0.012 450.82 464.05 457.00 465.50 1.94% 7.37 0.84 1.23 458.62 458.62 0.38 4.15 462.77 0.50 0.42 0.84 464.04 0.50 457.75 464.04 0.07 1.32 1.11 1.65 11.37 7.37 1.05 2.17 466.13 0.63 Overtopping!! CB 6.1 CB 6.2 0.00 1.65 292.0 12 0.012 457.00 465.50 468.00 478.00 3.77% 2.10 0.07 0.48 466.13 466.13 0.25 0.53 469.00 0.50 0.03 0.07 469.10 0.50 468.50 469.10 0.07 0.48 0.03 1.65 1.58 2.10 0.04 0.07 469.10 -8.90 Okay CB 6.2 CB 6.3 0.00 1.65 59.0 12 0.012 468.00 478.00 472.00 482.10 6.78% 2.10 0.07 0.48 469.10 469.10 0.25 0.11 473.00 0.50 0.03 0.07 473.10 0.50 472.50 473.10 0.35 0.00 1.65 2.10 472.76 -9.34 Okay CB 6.3 CB 6.4 1.65 1.65 83.0 8 0.012 472.00 482.10 480.00 483.00 9.64% 4.73 0.35 0.54 472.76 472.76 0.17 1.31 480.67 0.50 0.17 0.35 481.19 0.50 480.33 481.19 0.00 0.00 4.73 481.19 -1.81 Okay CB 6.1 CB 7.1 0.54 1.53 242.0 12 0.012 457.50 465.50 460.00 465.00 1.03% 1.95 0.06 0.46 466.13 466.13 0.25 0.38 466.51 0.50 0.03 0.06 466.60 0.50 460.50 466.60 0.13 0.00 1.00 1.95 466.47 1.47 Overtopping!! PIPE OUTLET #9 CB 7.2 1.00 1.00 20.0 8 0.012 464.00 465.00 464.10 465.70 0.50% 2.85 0.13 0.42 466.47 466.47 0.17 0.12 466.59 0.50 0.06 0.13 466.78 0.50 464.43 466.78 0.00 0.00 2.85 466.78 1.08 Overtopping!! CB 6.1 CB 8.1 0.08 1.92 39.0 8 0.012 457.00 465.50 462.00 465.50 12.82% 5.51 0.47 0.58 466.13 466.13 0.17 0.84 466.97 0.50 0.24 0.47 467.68 0.50 462.33 467.68 0.12 1.32 0.62 0.98 0.87 5.51 0.24 0.86 468.42 2.92 Overtopping!! CB 8.1 CB 8.2 0.25 0.98 63.0 8 0.012 462.00 465.50 462.66 466.50 1.05% 2.79 0.12 0.42 468.42 468.42 0.17 0.35 468.77 0.50 0.06 0.12 468.95 0.50 462.99 468.95 0.07 1.32 0.16 0.72 2.79 0.16 469.04 2.54 Overtopping!! CB 8.2 CB 8.3 0.26 0.72 63.0 8 0.012 462.66 466.50 463.32 466.50 1.05% 2.06 0.07 0.36 469.04 469.04 0.17 0.19 469.23 0.50 0.03 0.07 469.33 0.50 463.65 469.33 0.03 0.00 0.46 2.06 469.31 2.81 Overtopping!! CB 8.3 CB 8.4 0.46 0.46 58.0 8 0.012 463.32 466.50 463.93 466.80 1.05% 1.31 0.03 0.28 469.31 469.31 0.17 0.07 469.38 0.50 0.01 0.03 469.42 0.50 464.26 469.42 0.10 0.00 0.87 1.31 469.32 2.52 Overtopping!! CB 8.1 CB 8.5 0.43 0.87 39.0 8 0.012 462.00 465.50 462.82 466.50 2.10% 2.50 0.10 0.39 469.32 469.32 0.17 0.17 469.49 0.50 0.05 0.10 469.64 0.50 463.15 469.64 0.03 0.48 0.05 0.44 2.50 0.05 469.66 3.16 Overtopping!! CB 8.5 CB 8.6 0.44 0.44 51.0 8 0.012 462.82 466.50 463.37 466.50 1.08% 1.27 0.03 0.27 469.66 469.66 0.17 0.06 469.72 0.50 0.01 0.03 469.75 0.50 463.70 469.75 1.32 0.03 0.00 1.27 0.03 469.79 3.29 Overtopping!! CB 6.1 CB 9.1 2.00 7.92 89.0 18 0.012 457.00 465.50 462.00 465.50 5.62% 4.48 0.31 0.96 466.13 466.13 0.38 0.43 466.56 0.50 0.16 0.31 467.03 0.50 462.75 467.03 0.00 0.00 4.48 467.03 1.53 Overtopping!! CB 6.2 CB 10.1 0.00 1.58 60.0 8 0.012 468.00 478.00 469.00 477.00 1.67% 4.54 0.32 0.53 458.62 468.60 0.17 0.87 469.67 0.50 0.16 0.32 470.15 0.50 469.33 470.15 0.32 0.48 0.15 1.58 4.54 0.15 469.98 -7.02 Okay CB 10.1 CB 10.2 0.11 1.58 86.0 8 0.012 469.00 477.00 470.50 473.50 1.74% 4.54 0.32 0.53 469.98 469.98 0.17 1.25 471.23 0.50 0.16 0.32 471.71 0.50 470.83 471.71 0.19 0.48 0.15 1.21 4.54 0.15 471.68 -1.82 Okay CB 10.2 CB 10.3 1.21 1.21 64.0 8 0.012 470.50 473.50 471.00 474.00 0.78% 3.46 0.19 0.46 471.68 471.68 0.17 0.54 472.22 0.50 0.09 0.19 472.50 0.50 471.33 472.50 0.01 0.00 0.26 3.46 472.49 -1.51 Okay PIPE OUTLET #8 CB 10.4 0.26 0.26 51.0 8 0.012 475.80 476.50 480.00 484.00 8.24% 0.76 0.01 0.21 472.49 476.24 0.17 0.02 480.67 0.50 0.00 0.01 480.68 0.50 480.33 480.68 0.00 0.00 0.76 480.68 -3.32 Okay PIPE OUTLET #6 CB 11.1 0.69 3.24 101.0 12 0.012 464.00 464.50 465.50 468.80 1.49% 4.13 0.26 0.68 464.50 464.84 0.25 0.71 466.50 0.50 0.13 0.26 466.90 0.50 466.00 466.90 0.83 0.48 0.13 2.55 4.13 0.13 466.20 -2.60 Okay CB 11.1 CB 11.2 0.58 2.55 72.0 8 0.012 465.50 468.80 469.50 472.30 5.56% 7.30 0.83 0.63 466.20 466.20 0.17 2.71 470.17 0.50 0.41 0.83 471.41 0.50 469.83 471.41 0.49 0.00 1.96 7.30 470.92 -1.38 Okay CB 11.2 CB 11.3 0.75 1.96 70.0 8 0.012 469.50 472.30 472.50 475.50 4.29% 5.63 0.49 0.56 470.92 470.92 0.17 1.57 473.17 0.50 0.25 0.49 473.90 0.50 472.83 473.90 0.19 0.00 1.21 5.63 473.72 -1.78 Okay CB 11.3 CB 11.4 0.01 1.21 70.0 8 0.012 472.50 475.50 476.00 480.50 5.00% 3.47 0.19 0.41 473.72 473.72 0.17 0.59 476.67 0.50 0.09 0.19 476.95 0.50 476.33 476.95 0.18 0.00 1.20 3.47 476.76 -3.74 Okay CB 11.4 CB 11.5 1.20 1.20 14.0 8 0.012 476.00 480.50 476.50 480.00 3.57% 3.43 0.18 0.40 476.76 476.76 0.17 0.12 477.17 0.50 0.09 0.18 477.44 0.50 476.83 477.44 1.32 0.24 0.00 3.43 0.24 477.68 -2.32 Okay PIPE OUTLET #7 CB 12.1 0.00 2.67 42.0 12 0.012 464.00 464.50 465.00 467.50 2.38% 3.40 0.18 0.33 464.50 464.67 0.25 0.20 466.00 0.50 0.09 0.18 466.27 0.50 465.50 466.27 0.91 0.48 0.09 2.67 3.40 0.09 465.45 -2.05 Okay CB 12.1 CB 12.2 2.67 2.67 120.0 8 0.012 465.00 467.50 473.50 479.00 7.08% 7.66 0.91 0.33 465.45 465.50 0.17 4.97 474.17 0.50 0.46 0.91 475.53 0.50 473.83 475.53 1.32 1.20 0.00 7.66 1.20 476.73 -2.27 Okay CB 2.7 CB 13.1 0.32 4.19 129.0 12 0.012 452.91 461.80 456.20 461.20 2.55% 5.34 0.44 0.33 459.02 459.02 0.25 1.51 460.54 0.50 0.22 0.44 461.20 0.50 456.70 461.20 0.38 1.32 0.58 3.88 5.34 0.58 461.41 0.21 Overtopping!! CB 13.1 CB 13.2 1.78 3.88 125.0 12 0.012 456.20 461.20 459.20 464.20 2.40% 4.94 0.38 0.33 461.41 461.41 0.25 1.25 462.66 0.50 0.19 0.38 463.23 0.50 459.70 463.23 0.11 0.00 2.09 4.94 463.12 -1.08 Okay CB 13.2 CB 13.3 2.09 2.09 109.0 12 0.012 459.20 464.20 460.29 463.50 1.00% 2.66 0.11 0.33 463.12 463.12 0.25 0.32 463.44 0.50 0.06 0.11 463.60 0.50 460.79 463.60 0.00 0.00 2.66 463.60 0.10 Overtopping!! CB 13.3 CB 13.4 2.57 2.57 117.0 12 0.012 460.29 463.50 462.00 466.00 1.46% 3.27 0.17 0.33 463.60 463.60 0.25 0.52 464.12 0.50 0.08 0.17 464.37 0.50 462.50 464.37 0.00 0.00 0.08 3.27 464.37 -1.63 Okay PIPE OUTLET #8 CB 21.1 0.08 0.08 58.0 8 0.012 452.50 453.50 453.80 456.80 2.24% 0.22 0.00 0.33 451.00 453.00 0.17 0.00 454.47 0.50 0.00 0.00 454.47 0.50 454.13 454.47 0.00 0.22 454.47 -2.33 Okay FWHS - Backwater Conveyance Calculation-Ph2 Permit.xls 7/30/2014 Conveyance System Information Outlet Control Inlet Control Headwater Summation Overtopping Check Pipe Segment Surface Total Length Pipe "n" Down- Down- Up- Up- Pipe Barrel Barrel Critical TW TW Barrel Friction Entrance Entrance Entrance Exit Outlet Inlet Inlet Control Approach Bend Bend Q1 Q3 V1 Junction Head HW (HW - Rim) Over- CB/MH # CB/MH # Flow Flow L Size value Stream Stream Stream Stream Slope Velocity Velocity Depth Elev. Check Hyd. Loss HGL Ke Head Head Control Control Control HW Veloctiy Kb Head Head Loss Elev. Clearance topping Down Up Q Qtot D Invert Rim Invert Rim Head Rad.Elev.Loss Loss Elev.HW/D Elev.Elev.Head Loss Loss Total Check CFS CFS FT IN FT FT FT FT % FPS FT FT FT FT FT FT FT FT FT FT FT FT FT FT FT CFS CFS FPS FT FT FT FT CB 2.8 CB 17.1 0.66 0.66 77.0 8 0.012 456.23 458.50 457.00 459.00 1.00% 1.88 0.05 0.33 459.21 459.21 0.17 0.19 459.40 0.50 0.03 0.05 459.48 0.50 457.33 459.48 1.32 0.07 1.88 0.07 459.56 0.56 Overtopping!! S 308th Street ROW EX CB #1 CB 14.1 0.05 7.59 26.0 30 0.012 429.00 433.42 429.65 433.35 2.50% 1.55 0.04 0.94 429.65 430.72 0.63 0.01 432.15 0.50 0.02 0.04 432.21 0.50 430.90 432.21 0.09 0.00 7.53 6.60 1.55 0.02 0.02 432.14 -1.21 Okay CB 14.1 CB 14.2 0.38 7.53 91.0 24 0.012 429.65 433.35 430.14 432.68 0.54% 2.40 0.09 0.94 432.14 432.14 0.50 0.09 432.22 0.50 0.04 0.09 432.35 0.50 431.14 432.35 0.13 0.00 5.07 2.08 2.40 0.03 0.03 432.25 -0.43 Caution CB 14.2 CB 14.3 1.63 5.07 52.0 18 0.012 430.14 432.68 430.43 432.47 0.56% 2.87 0.13 0.86 432.25 432.25 0.38 0.10 432.36 0.50 0.06 0.13 432.55 0.50 431.18 432.55 0.06 0.00 3.43 2.87 432.49 0.02 Overtopping!! CB 14.3 CB 14.4 0.23 3.43 8.0 18 0.012 430.43 432.47 430.50 432.41 0.87% 1.94 0.06 0.75 432.49 432.49 0.38 0.01 432.50 0.50 0.03 0.06 432.58 0.50 431.25 432.58 0.26 0.00 3.21 1.94 432.32 -0.09 Caution CB 14.4 CB 14.5 0.32 3.21 109.0 12 0.012 430.50 432.41 432.00 434.72 1.38% 4.08 0.26 0.82 432.32 432.32 0.25 0.75 433.07 0.50 0.13 0.26 433.46 0.50 432.50 433.46 0.21 0.00 2.88 4.08 433.25 -1.47 Okay CB 14.5 CB 14.6 0.19 2.88 174.0 12 0.012 432.00 434.72 441.00 444.72 5.17% 3.67 0.21 0.79 433.25 433.25 0.25 0.97 442.00 0.50 0.10 0.21 442.31 0.50 441.50 442.31 0.04 0.00 1.21 1.48 3.67 0.13 0.13 442.41 -2.31 Okay CB 14.6 CB 14.7 1.21 1.21 100.0 12 0.012 441.00 444.72 447.00 450.85 6.00% 1.55 0.04 0.41 442.41 442.41 0.25 0.10 448.00 0.50 0.02 0.04 448.06 0.50 447.50 448.06 0.00 1.21 1.55 448.06 -2.79 Okay CB 14.1 CB 15.1 2.08 2.08 58.0 8 0.012 430.14 432.68 434.50 437.50 7.52% 5.97 0.55 0.62 432.25 432.25 0.17 1.46 435.17 0.50 0.28 0.55 436.00 0.50 434.83 436.00 1.32 0.73 0.00 5.97 0.73 436.73 -0.77 Okay CB 14.5 CB 16.1 1.36 1.36 50.0 8 0.012 441.00 444.72 442.50 445.50 3.00% 3.91 0.24 0.49 442.41 442.41 0.17 0.54 443.17 0.50 0.12 0.24 443.52 0.50 442.83 443.52 0.00 1.32 0.31 0.00 3.91 0.31 443.83 -1.67 Okay CB 14.6 CB 16.2 0.04 0.12 33.0 8 0.012 447.33 450.85 450.00 454.00 8.09% 0.33 0.00 0.52 442.41 447.92 0.17 0.00 450.67 0.50 0.00 0.00 450.67 0.50 450.33 450.67 1.32 0.00 0.00 0.33 0.00 450.67 -3.33 Okay S 304th Street ROW CB 18.2 CB 18.3 0.58 1.67 102.0 12 0.012 444.00 447.39 451.43 456.43 7.28% 2.13 0.07 0.33 445.20 445.20 0.25 0.19 452.43 0.50 0.04 0.07 452.54 0.50 451.93 452.54 0.01 0.00 1.09 2.13 452.52 -3.91 Okay CB 18.3 CB 18.4 0.37 1.09 297.0 12 0.012 451.43 456.43 467.68 472.68 5.47% 1.39 0.03 0.33 452.52 452.52 0.25 0.24 468.68 0.50 0.02 0.03 468.73 0.50 468.18 468.73 0.00 0.00 0.72 1.39 468.72 -3.96 Okay CB 18.4 CB 18.5 0.36 0.72 197.0 12 0.012 467.68 472.68 473.53 478.53 2.97% 0.92 0.01 0.33 468.72 468.72 0.25 0.07 474.53 0.50 0.01 0.01 474.55 0.50 474.03 474.55 0.00 0.00 0.36 0.92 474.55 -3.98 Okay CB 18.5 CB 18.6 0.36 0.36 197.0 12 0.012 473.53 478.53 478.25 483.26 2.40% 0.45 0.00 0.33 474.55 474.55 0.25 0.02 479.25 0.50 0.00 0.00 479.25 0.50 478.75 479.25 0.00 0.10 0.45 479.25 -4.01 Okay CB 18.6 CB 18.7 0.10 0.10 196.0 12 0.012 478.25 483.26 480.25 488.25 1.02% 0.13 0.00 0.33 479.25 479.25 0.25 0.00 481.25 0.50 0.00 0.00 481.25 0.50 480.75 481.25 0.00 0.00 0.13 481.25 -7.00 Okay CB 18.1 CB 19.1 0.04 1.72 42.0 8 0.012 439.30 443.94 441.50 444.50 5.24% 4.92 0.38 0.33 443.30 443.30 0.17 0.72 444.02 0.50 0.19 0.38 444.58 0.50 441.83 444.58 0.00 0.00 4.92 444.58 0.08 Overtopping!! PIPE OUTLET #10 CB 18.2 0.00 1.67 27.0 8 0.012 443.50 444.50 444.00 447.39 1.85% 4.79 0.36 0.33 444.00 444.00 0.17 0.44 444.67 0.50 0.18 0.36 445.20 0.50 444.33 445.20 0.00 0.00 4.79 445.20 -2.19 Okay FWHS - Backwater Conveyance Calculation-Ph2 Permit.xls 7/30/2014 APPENDIX D – SEDIMENT POND SIZING Developed (15-min time series) 2 Year Flow for Sediment Pond Sizing Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 Section 5 – Conveyance System Analysis and Design Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 The proposed project contains a new conveyance network consisting of catch basins, roof downspouts, trench drains, and area drains. A conveyance analysis is not included as part of the preliminary report. A complete analysis will be included in the final report. Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 Section 6 – Special Reports and Studies Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 A Geotechnical Engineering Report was prepared by Associated Earth Sciences, Inc. dated February 8, 2021. The investigation determined that the site was underlain by a combination of fill and pre-Fraser deposits. The fill was characterized as being native to the site, presumably from past projects. The pre- Fraser deposits consisted of medium dense to very dense silty, fine to medium sand with gravel. Both soil types are considered moisture sensitive. The complete Geotechnical Engineering Report is included as Figure 6-1. Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 Section 6 – Figures 6-1 GEOTECHICAL ENGINEERING REPORT Kirkland | Tacoma | Mount Vernon 425-827-7701 | www.aesgeo.com February 8, 2021 Project No. 20200453E001 Federal Way Public Schools 33330 8th Avenue South Federal Way, Washington 98003 Attention: Mr. Delin Huang Subject: Preliminary Geotechnical Engineering Recommendations Federal Way High School Memorial Field Improvements 1344 South 308th Street Federal Way, Washington Dear Mr. Huang: This letter-report summarizes Associated Earth Sciences, Inc.’s (AESI’s) preliminary geotechnical engineering recommendations for the proposed improvements to the Federal Way High School Memorial Field located at 1344 South 308th Street in Federal Way, Washington. Our recommendations are based on review of our previous work completed on the Federal Way High School site, which has included subsurface explorations, geotechnical engineering studies, and construction monitoring. Our work was completed in accordance with our proposal, dated December 21, 2020. SITE AND PROJECT DESCRIPTION The project site is the Memorial Field athletics field and parking lot at the southwest corner of the existing Federal Way High School property, located at 1344 South 308th Street in Federal Way, Washington (King County Parcel No. 0821049001). The site is shown on the “Vicinity Map,” Figure 1. The parking lot and stadium are roughly rectangular-shaped portions of the high school parcel and are bound to the north by the high school baseball field, to the east by a parking lot and the school building, to the south by South 308th Street, and to the west by existing stormwater ponds and residential development. The football field is surrounded by an athletic track and oriented with its long axis north-south. Grandstands overlook the field from the east and west sides. The existing parking lot is gravel-surfaced, with ingress and egress at the east and west ends of the parking lot. The ground surface is basically flat over most of the parking lot and Federal Way High School Memorial Field Improvements Preliminary Federal Way, Washington Geotechnical Engineering Recommendations February 8, 2021 ASSOCIATED EARTH SCIENCES, INC. NS/ld - 20200453E001-3 Page 2 field and then slopes upward to the east at an inclination of about 2 Horizontal:1 Vertical (2H:1V) on the east side of the field. Overall vertical relief across the site is on the order of 25 feet. Details of the proposed improvements are limited at this time, but the improvements are planned to occur in two phases. The first phase would consist of improvements to the parking area and the second phase would consist of improvements to the stadium and field. Specifically, the proposed improvements include the following: • replacement of several stadium structures, including grandstands, bathrooms, and other accessory structures; • new asphalt pavement in the stadium parking lot; • new pavement of pathways throughout the site; • replacement of track surfaces and artificial turfs; • improvements to infrastructure for site lighting, security, and other systems; and • possibly frontage improvements. The purpose of our work was to use existing subsurface information to develop preliminary geotechnical engineering design recommendations for pavement, foundations, structural fills, and seismic site class per current code requirements. The recommendations contained in the letter-report are considered preliminary. The subsurface conditions that are the basis for the recommendations in the letter-report were extrapolated from site explorations advanced for the neighboring high school project. The assumed subsurface conditions should be verified by site-specific explorations or by observation of exposed subgrades at the time of construction. If differing subsurface conditions are encountered, the conclusions and recommendations contained in this letter-report should be confirmed or changed to reflect the actual conditions encountered. PREVIOUS SUBSURFACE EXPLORATION In order to collect subsurface information at the areas of the proposed improvements, we reviewed our previous study at the site, which included drilling 10 exploration borings on January 2 and 3, 2014 using a hollow-stem auger drilling rig. Our findings and analyses were reported in our geotechnical engineering report titled, “Subsurface Exploration, Geologic Hazards, and Geotechnical Engineering Report, Federal Way High School Replacement,” dated as revised October 31, 2014. Eight of the 2014 exploration borings were drilled at the southeast corner of the parcel near the high school building and two were drilled west of the Memorial Field and parking lot area. The locations of the four nearest exploration borings, EB-4, EB-5, EB-9, and EB-10, are shown on the “Existing Site and Exploration Plan,” Figure 2, and logs of these Federal Way High School Memorial Field Improvements Preliminary Federal Way, Washington Geotechnical Engineering Recommendations February 8, 2021 ASSOCIATED EARTH SCIENCES, INC. NS/ld - 20200453E001-3 Page 3 explorations are included in the Appendix. Additional subsurface explorations were not included in this scope of work. The conclusions and recommendations presented in this letter-report are based on review of our previous exploration borings at the site. The number, locations, and depths of the explorations were completed within site and budgetary constraints. Because of the nature of exploratory work below ground, interpolation of subsurface conditions between field explorations is necessary. It should be noted that differing subsurface conditions may sometimes be present due to the random nature of deposition and the alteration of topography by past grading and/or filling. The nature and extent of any variations between the field explorations may not become fully evident until construction. If variations are observed at that time, it may be necessary to re-evaluate specific recommendations in this letter-report and make appropriate changes. Ground surface elevations and subsurface conditions observed at the exploration boring locations may have been altered by the construction and grading activities that occurred after the exploration during construction of the existing school, and the conditions observed at the time of drilling may no longer be representative of existing conditions. The various types of soil and groundwater elevations, as well as the depths where soil and groundwater characteristics changed, are indicated on the exploration boring logs presented in the Appendix. The depths indicated on the logs where conditions changed may represent gradational variations between sediment types in the field. If changes occurred between sample intervals in our borings, they were interpreted. SUBSURFACE CONDITIONS Subsurface conditions at the project site were inferred from the field explorations accomplished for our 2014 study and review of selected applicable geologic literature. The general distribution of geologic units is shown on the exploration logs. The explorations generally encountered native pre-Fraser sediments overlain in some areas by existing fill. Stratigraphy The following sections present more detailed subsurface information organized from the youngest (shallowest) to the oldest (deepest) sediment types. Federal Way High School Memorial Field Improvements Preliminary Federal Way, Washington Geotechnical Engineering Recommendations February 8, 2021 ASSOCIATED EARTH SCIENCES, INC. NS/ld - 20200453E001-3 Page 4 Existing Fill Fill soils (soils not naturally placed) were encountered at the locations of exploration borings EB-9 and EB-10 to depths of 11 and 7 feet below the ground surface, respectively. The fill generally consisted of loose, silty sand with gravel. Portions of the fill contained organic material. We interpret the encountered fill as likely resulting from past grading activities, including the filling of low areas west of the stadium and field. Fill thickness can vary over short distances and may be deeper than observed in our explorations. Due to the variable density and content, the existing fill soils are not suitable for foundation support. Pre-Fraser Deposits In exploration borings EB-4 and EB-5 and underlying the fill in exploration borings EB-9 and EB-10, sediments consisted of medium dense to very dense, silty, fine to medium sand with gravel, siltier areas, silt beds, and trace organics, interpreted as pre-Fraser deposits. The pre-Fraser deposits were placed prior to the Fraser Glaciation and subsequently compacted by the weight of the overlying glacial ice. The upper 3 to 5 feet of the pre-Fraser deposits were of lower density, interpreted as being due to weathering. The pre-Fraser deposits extended to the full depths explored of approximately 15.9 to 21.5 feet, as shown on the exploration logs in the Appendix. The medium dense to very dense material is generally considered suitable for support of light- to heavily-loaded foundations when in an intact, undisturbed condition. This material is moisture- sensitive and susceptible to disturbance when wet. Groundwater We encountered groundwater seepage in exploration borings EB-9 and EB-10 at depths of 10 and 14 feet, respectively. We anticipate that the encountered groundwater likely represents a local groundwater table within the underlying pre-Fraser deposits. We expect that shallow groundwater seepage would likely represent interflow within the existing fill. Interflow occurs when surface water percolates down through the surficial weathered or higher-permeability sediments and becomes perched atop underlying, lower-permeability sediments. It should be noted that the occurrence and level of groundwater seepage at the site may vary in response to such factors as changes in season, precipitation, and site use. The explorations reviewed for this study were completed on January 2 and 3, 2014. PRELIMINARY GEOTECHNICAL DESIGN RECOMMENDATIONS From a geotechnical engineering standpoint, it is our opinion that the site is suitable for the proposed improvements provided the recommendations contained in this letter-report are Federal Way High School Memorial Field Improvements Preliminary Federal Way, Washington Geotechnical Engineering Recommendations February 8, 2021 ASSOCIATED EARTH SCIENCES, INC. NS/ld - 20200453E001-3 Page 5 incorporated into the design and construction of the project. In general, foundations can be supported by medium dense or denser native soils or structural fill, where dense, non-organic existing fill is present under proposed lightly-loaded structures, such as pavement; it may be suitable for structural support provided the subgrade can be compacted to a firm and unyielding condition and with the approval of the geotechnical engineer. The following sections provide preliminary recommendations for seismic site class, site preparation, structural fill, foundations, pavement, and drainage. Seismic Site Class Seismic design shall be in accordance with the 2015 International Building Code (IBC). The native soils at the site are consistent with seismic Site Class “D” as defined in ASCE 7 - Minimum Design Loads for Buildings and Other Structures (2010) as referenced by the 2015 IBC and Site Class “D” seismic design parameters should be used for design. Site Preparation Existing buried utilities, vegetation, topsoil, demolition debris, and any other deleterious materials should be removed where they are located below planned construction areas. All disturbed soils should be removed to expose underlying, undisturbed, native sediments and replaced with structural fill, as needed. All excavations below final grade made for demolition or clearing and grubbing activities should be backfilled, as needed, with structural fill. Erosion and surface water control should be established around the clearing limits to satisfy local requirements. Once clearing and grubbing activities have been completed, existing fill, where encountered, should be addressed. We recommend that existing fill be removed from below areas of planned foundations to expose underlying, undisturbed native sediments, followed by restoration of the planned foundation grade with compacted structural fill. Removal of existing fill should extend laterally beyond the new foundation footprint a minimum of 2 feet. Care should be taken not to disturb support soils of existing foundations, if any will remain. Support soils should be considered those soils within a prism projected downward and outward from existing footings at inclinations of 1H:1V. Where existing fill is removed and replaced with structural fill, conventional shallow foundations may be used for building support. The required depth of removal should be determined in the field based on actual conditions encountered during excavation. Site Disturbance The site soils contained a high percentage of fine-grained material, which makes them moisture- sensitive and subject to disturbance when wet. The contractor must use care during site Federal Way High School Memorial Field Improvements Preliminary Federal Way, Washington Geotechnical Engineering Recommendations February 8, 2021 ASSOCIATED EARTH SCIENCES, INC. NS/ld - 20200453E001-3 Page 6 preparation and excavation operations so that the underlying soils are not softened. If disturbance occurs to soils in structural areas, the softened soils should be removed and the area brought to grade with structural fill. Proof-Rolling Following the recommended clearing, stripping, and any planned excavation, the stripped subgrade within large paving areas should be proof-rolled with heavy, rubber-tired construction equipment, such as a fully-loaded, tandem-axle dump truck. Proof-rolling should be performed prior to structural fill placement or foundation excavation. The proof-roll should be monitored by the geotechnical engineer so that any soft or yielding subgrade soils can be identified. Any soft/loose, yielding soils should be removed to expose firm and unyielding subgrade. The subgrade should then be scarified, adjusted in moisture content, and recompacted to the required density. Proof-rolling should only be attempted if soil moisture contents are at or near optimum moisture content. Proof-rolling of wet subgrades could result in further degradation. Low areas and excavations may then be raised to the planned finished grade with compacted structural fill. Subgrade preparation and selection, placement, and compaction of structural fill should be performed under engineering-controlled conditions in accordance with the project specifications. Structural Fill Placement of structural fill may be necessary to establish desired grades at the site or to backfill utility trenches or around foundations. All references to structural fill in this letter-report refer to subgrade preparation, fill type, and placement and compaction of materials as discussed in this section. If a percentage of compaction is specified under another section of this letter-report the value given in that section should be used. After overexcavation/stripping has been performed to the satisfaction of the geotechnical engineer/engineering geologist, the exposed ground surface should be recompacted to a firm and unyielding condition. If the subgrade contains too much moisture, suitable recompaction may be difficult or impossible to attain and should probably not be attempted. In lieu of recompaction, the area to receive fill should be blanketed with washed rock or quarry spalls to act as a capillary break between the new fill and the wet subgrade. Where the exposed ground remains soft and further overexcavation is impractical, placement of an engineered stabilization fabric may be necessary to prevent contamination of the free-draining layer by silt migration from below. After recompaction of the exposed ground is approved by the geotechnical engineer, or a free-draining rock course is laid, structural fill may be placed to attain desired grades. Federal Way High School Memorial Field Improvements Preliminary Federal Way, Washington Geotechnical Engineering Recommendations February 8, 2021 ASSOCIATED EARTH SCIENCES, INC. NS/ld - 20200453E001-3 Page 7 Structural fill is defined as non-organic soil, acceptable to the geotechnical engineer, placed in maximum 8-inch loose lifts, with each lift being compacted to at least 95 percent of the modified Proctor maximum dry density using ASTM International (ASTM) D-1557 as the standard. Utility trench backfill should be placed and compacted in accordance with applicable municipal codes and standards. The top of the compacted fill should extend horizontally a minimum distance of 3 feet beyond footings or pavement edges before sloping down at an angle no steeper than 2H:1V. Fill slopes should either be overbuilt and trimmed back to final grade or surface-compacted to the specified density. We recommend that a clean, free-draining gravel and/or sand be used in structural areas. Free-draining fill consists of non-organic soil with the amount of fine-grained material limited to 5 percent by weight when measured on the minus No. 4 sieve fraction. Soils in which the amount of fine-grained material (smaller than No. 200 sieve) is greater than approximately 5 percent (measured on the minus No. 4 sieve size) should be considered moisture-sensitive. Portions of the site soils contained significant fine-grained fractions and are considered moisture-sensitive. The use of moisture-sensitive soil in structural fills should be limited to favorable dry weather conditions and non-structural areas such as under landscaping. The contractor should note that any proposed fill soils must be evaluated by AESI prior to their use in fills. This would require that we have a sample of the material at least 3 business days in advance to perform a Proctor test and determine its field compaction standard. A representative from our firm should observe the stripped subgrade and be present during placement of structural fill to monitor the work and perform a representative number of in-place density tests. In this way, the adequacy of the earthwork may be evaluated as filling progresses and any problem areas may be corrected at that time. It is important to understand that taking random compaction tests on a part-time basis will not assure uniformity or acceptable performance of a fill. As such, we are available to aid the owner in developing a suitable monitoring and testing frequency. Foundations In the exploration borings located near the site, suitable bearing soils were observed at depths of about 5 feet in EB-4 and EB-5 east of the site and 8 to 12 feet in EB-9 and EB-10 west of the site. Based on our current understanding of the project, significant foundations are not planned near the western part of the site, where the bearing stratum was encountered relatively deep within the existing detention pond areas. Therefore, we anticipate that any proposed structures can be supported on conventional shallow spread footings. If changes to the proposed improvements include new foundations near the west end of the site, additional field studies Federal Way High School Memorial Field Improvements Preliminary Federal Way, Washington Geotechnical Engineering Recommendations February 8, 2021 ASSOCIATED EARTH SCIENCES, INC. NS/ld - 20200453E001-3 Page 8 may be needed to verify subsurface conditions and depth to bearing soils in the proposed foundation areas. For footings bearing directly on medium dense to dense natural sediments, or on structural fill placed over these materials as described above, we recommend that an allowable foundation soil bearing pressure of 2,500 pounds per square foot (psf) be used for design purposes, including both dead and live loads. An increase of one-third may be used for short-term wind or seismic loading. Perimeter footings should be buried at least 18 inches into the surrounding soil for frost protection. However, all footings must penetrate to the prescribed bearing stratum, and no footing should be founded in or above organic or loose soils. All footings should have a minimum width of 18 inches. It should be noted that the area bound by lines extending downward at 1H:1V from any footing must not intersect another footing or intersect a filled area that has not been compacted to at least 95 percent of ASTM D-1557. In addition, a 1.5H:1V line extending down from any footing must not daylight because sloughing or raveling may eventually undermine the footing. Thus, footings should not be placed near the edge of steps or cuts in the bearing soils. Anticipated settlement of footings founded as described above should be on the order of 1 inch or less. However, disturbed soil not removed from footing excavations prior to footing placement could result in increased settlements. All footing areas should be inspected by AESI prior to placing concrete to verify that the design bearing capacity of the soils has been attained and that construction conforms to the recommendations contained in this letter-report. Such inspections may be required by the City of Federal Way. Perimeter footing drains should be provided, as discussed under the “Drainage Considerations” section of this letter-report. Floor Support Slab-on-grade floors may be used over medium dense or denser native soils, inorganic existing fills soils re-compacted to 95 percent relative compaction, or over structural fill placed as recommended in the “Site Preparation” and “Structural Fill” sections of this letter-report. Slab design can assume a soil subgrade modulus of 200 pounds per cubic inch (pci) for slabs cast over the medium dense, natural sediments, re-compacted existing fill or properly compacted structural fill placed over these materials. Slab-on-grade floors should be cast atop a minimum of 4 inches of washed pea gravel or washed crushed “chip” rock with less than 3 percent passing the U.S. No. 200 sieve to act as a capillary break. The floors should also be protected from dampness by covering the capillary break layer with an impervious moisture barrier at least 10 mils in thickness. Federal Way High School Memorial Field Improvements Preliminary Federal Way, Washington Geotechnical Engineering Recommendations February 8, 2021 ASSOCIATED EARTH SCIENCES, INC. NS/ld - 20200453E001-3 Page 9 Passive Resistance and Friction Factors All backfill around foundation units should be placed per our recommendations for structural fill and as described in the “Structural Fill” section of this letter-report. Lateral loads can be resisted by friction between the foundation and the natural glacial soils or supporting structural fill soils, and by passive earth pressure acting on the buried portions of the foundations. The foundations must be backfilled with structural fill and compacted to at least 95 percent of the maximum dry density to achieve the passive resistance provided below. We recommend the following allowable design parameters: Passive equivalent fluid = 350 pounds per cubic foot Coefficient of friction = 0.35 Drainage Considerations Foundations should be provided with foundation drains placed at the bottom of footing or slab elevation. Drains should consist of rigid, perforated, polyvinyl chloride (PVC) pipe surrounded by washed pea gravel. The drains should be constructed with sufficient gradient to allow gravity discharge away from any proposed buildings. Roof and surface runoff should not discharge into the footing drain system, but should be handled by a separate, rigid, tightline drain. In planning, exterior grades adjacent to walls should be sloped downward away from the proposed structures to achieve surface drainage. Pavement Pavement areas should be prepared in accordance with the “Site Preparation” section of this letter-report. If the stripped native soil or existing fill pavement subgrade can be compacted to 95 percent of ASTM D-1557 and is firm and unyielding, no additional overexcavation is required. Soft or yielding areas should be overexcavated to provide a suitable subgrade and backfilled with structural fill. The pavement sections included in this letter-report section are for driveway and parking areas onsite, and are not applicable to right-of-way improvements. At this time we are not aware of any planned right-of-way improvements; however, if any new paving of public streets is required, we should be allowed to offer situation-specific recommendations. The exposed ground should be recompacted to 95 percent of ASTM D-1557 and proof-rolled in accordance with the “Proof-Rolling” section of this letter-report. If required, structural fill may then be placed to achieve desired subbase grades. After the prepared subgrade is approved by the geotechnical engineer, the overlying pavement in areas of planned passenger car driving and parking can consist of a minimum of 2 inches of asphaltic concrete pavement (ACP) underlain by 4 inches of 1¼-inch crushed surfacing base course. In driveway areas subjected to heavier loads, Federal Way High School Memorial Field Improvements Preliminary Federal Way, Washington Geotechnical Engineering Recommendations February 8, 2021 ASSOCIATED EARTH SCIENCES, INC. NS/ld - 20200453E001-3 Page 10 such as that from delivery trucks or school buses, a minimum pavement section consisting of 3 inches of ACP underlain by 2 inches of 5/8-inch crushed surfacing top course and 4 inches of 1¼-inch crushed surfacing base course is recommended. The crushed rock courses must be compacted to 95 percent of the maximum density, as determined by ASTM D-1557. All paving materials should meet gradation criteria contained in the current Washington State Department of Transportation (WSDOT) Standard Specifications. Depending on construction staging and desired performance, the crushed base course material may be substituted with asphalt treated base (ATB) beneath the final asphalt surfacing. The substitution of ATB should be as follows: 4 inches of crushed rock can be substituted with 3 inches of ATB, and 6 inches of crushed rock may be substituted with 4 inches of ATB. ATB should be placed over a native or structural fill subgrade compacted to a minimum of 95 percent relative density, and a 1½- to 2-inch thickness of crushed rock to act as a working surface. If ATB is used for construction access and staging areas, some rutting and disturbance of the ATB surface should be expected. The general contractor should remove affected areas and replace them with properly compacted ATB prior to final surfacing. LIMITATIONS This letter-report has been prepared for the exclusive use of Federal Way Public Schools and their agents for specific application to this project. Within the limitations of scope, schedule, and budget, our services have been performed in accordance with generally accepted geotechnical engineering practices in effect in this area at the time our letter-report was prepared. No other warranty, express or implied, is made. CLOSURE Our recommendations should be considered preliminary in that project plans and construction details have not been finalized at the time of this letter-report. We are available to provide additional geotechnical consultation as the project design develops and possibly changes from that upon which this letter-report is based. We recommend that AESI perform a final geotechnical review of the plans prior to final design completion. In this way, our earthwork and foundation recommendations may be properly interpreted and implemented in the design. We are also available to provide geotechnical engineering and monitoring services during construction. The integrity of the foundations and pavement depends on proper site preparation and construction procedures. In addition, engineering decisions may have to be made in the field in the event that variations in subsurface conditions become apparent. Construction monitoring Federal Way High School Memorial Field Improvements Preliminary Federal Way, Washington Geotechnical Engineering Recommendations February 8, 2021 ASSOCIATED EARTH SCIENCES, INC. NS/ld - 20200453E001-3 Page 11 services are not part of this current scope of work. If these services are desired, please let us know, and we will prepare a proposal. We have enjoyed working with you on this study and are confident these recommendations will aid in the successful completion of your project. If you should have any questions or require further assistance, please do not hesitate to call. Sincerely, ASSOCIATED EARTH SCIENCES, INC. Kirkland, Washington ______________________________ Nicki Shobert, E.I.T. Kurt D. Merriman, P.E. Project Engineer Senior Principal Engineer Attachments: Figure 1. Vicinity Map Figure 2. Existing Site and Exploration Plan Appendix. Exploration Logs APPENDIX Exploration Logs Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 Section 7 – Other Permits Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 Other permits are required for the proposed project. Because the site disturbs more than one acre, a Construction Stormwater General Permit (CSWGP) is required by the Department of Ecology. A water and sewer permit is required from Lakehaven Water and Sewer District. A Use Process IV permit and Building Permit is required by the City of Federal Way. Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 Section 8 – CSWPPP Analysis and Design Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 The proposed project will comply with guidelines ser forth in the 2021 KCSWDM and in conformance with the required CSWGP. A Construction Stormwater Pollution Prevention Plan (CSWPPP) is not included as part of the preliminary report. A CSWPPP will be included in the final report. Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 Section 9 – Bond Quantities, Facilities Summaries, and Declarations of Covenant Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 A Site Improvement Bond Quantities Worksheet is not included as part of the preliminary report and will be included as part of the final report. Federal Way Public Schools is a state agency, and is therefore not subject to bonding requirements. Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 Section 10 – Operations and Maintenance Plan Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 For each flow control and water quality facility and/or BMP that is to be privately maintained, and for those that have special non-standard features, the Operations and Maintenance (O&M) Manual contains an outline of maintenance tasks and recommended frequency of each task. For the preliminary report, an O&M Manual is not included, and will be included in the final report. Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 Section 11 - Conclusion Federal Way Public Schools Memorial Field Preliminary Technical Information Report Project No: 21049 This project is designed to meet the requirements of the 2021 KCSWDM, as adopted by the City of Federal Way, as well as the City’s Addendum to the 2021 KCSWDM. This analysis is based on data and records either supplied to or obtained by Ethos Civil. The analysis has been prepared using procedures and practices within the standard accepted practices of the industry. Sincerely, Trevor McDonald, PE Civil Engineer Ethos Civil LLC