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20-100499-TIR-7-30-2021-V3TABLE OF CONTENTS PAGE 1.0 PROJECT OVERVIEW 1 2.0 CONDITIONS AND REQUIREMENTS SUMMARY 2 3.0 OFF-SITE ANALYSIS 4 4.0 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN 5 5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN 8 6.0 SPECIAL REPORTS AND STUDIES 8 7.0 OTHER PERMITS 8 8.0 ESC ANALYSIS AND DESIGN 8 9.0 BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT 8 10.0 OPERATIONS AND MAINTENANCE MANUAL 8 TABLE OF APPENDICES APPENDIX SOIL INFORMATION A DRAINAGE PLAN B EROSION AND SEDIMENT CONTROL PLAN C OPERATIONS AND MAINTENANCE MANUAL D DOWNSTREAM ANALYSIS E DRAINAGE CALCULATIONS F 1 | Page BUTKO LOT 14 SHORT PLAT PRELIMINARY TECHNICAL INFORMATION REPORT 1.0 PROJECT OVERVIEW This report accompanies the drainage review plan prepared for the Butko Lot 14 Short Plat project on parcel 0114700140 in the City of Federal Way, Washington. The site location is shown in Figure 1, below. The project has been designed to meet the requirements of the 2016 King County Surface Water Design Manual (KCSWDM) and the City of Federal Way’s Addendum to it. FIGURE 1 – Vicinity Map The existing site is a single-family residential lot approximately 0.34-acres in size and is predominantly an open lot with trees along the southern edge. The neighboring parcels are also single-family residential lots. The lot primarily slopes toward the west edge of the property based on topographic information per King County GIS. Historic land cover characteristics are provided below in Table 1. Project Site 2 | Page TABLE 1 – PREDEVELOPED AREAS Description Area (ft2) Total (ft2) Pervious Forest On-Site 15,027 15,027 Pervious Forest Off-Site (Bypass) 1,032 1,032 Total 16,059 The developed site will consist of two new single-family lots with a proposed impervious coverage of 5,313 square feet of roof area and 1,638 square feet of driveway. The remaining project area will be covered by landscaping. The developed areas are tallied below in Table 2. The developed sub-basin map will be included in Appendix B of the final TIR. TABLE 2 – DEVELOPED AREAS Description Area (ft2) Total (ft2) Impervious Roof Area 5,313 6,951 Driveway 1,638 Pervious Landscaping 8,164 8,164 Total 15,115 The soils present on the project site are identified by the NRCS web soil survey as Alderwood gravelly sandy loam (till). Stormwater runoff from the proposed project will be managed with basic dispersion. 2.0 CONDITIONS AND REQUIREMENTS SUMMARY The pre-developed site is assumed to have consisted of 16,189 square feet of forest. The developed site will contain 6,951 square feet of new impervious surface on the new residential lots and the proposed road improvements. The developed site will also contain 8,164 square feet of landscaping area. Since the project is for single family lots and will result in more than 2,000 square feet of target impervious surface, more than 7,000 square feet of land disturbing activity, and is not subject to Large Project Review, Directed Drainage Review will be required for this project. This report will show how the project complies with Core Requirements 1 through 9 and Special Requirements 1 through 5, as follows: Core Requirement #1: Discharge at Natural Location Under existing conditions, stormwater runoff from the project site naturally disperses toward the south and west edges of the property, across slopes less than 15%. This 3 | Page project proposes to discharge runoff to the south and west as it does under current conditions. Core Requirement #2: Off-site Analysis The existing downstream system will be reviewed to verify that no drainage or water quality problems are anticipated during existing or proposed conditions in the final TIR. The off-site system analysis will be included in Section 3.0 of the final report. Core Requirement #3: Flow Control Stormwater runoff from the developed site will not exceed a 0.15 cfs increase from the predeveloped, 100-year peak flow, and therefore flow control is not required for this project. Core Requirement #4: Conveyance System The conveyance system for this project includes pipes on the property that convey the stormwater to the dispersion system. They are sized appropriately to handle the stormwater that is anticipated. Core Requirement #5: Erosion and Sediment Control Erosion and sediment control requirements will be met for this project as described in Section 8.0. Core Requirement #6: Maintenance and Operations An operation and maintenance manual will be included in the final TIR and will provide the necessary guidance for operating and maintaining the on-site stormwater system. The on-site conveyance system and dispersion trenches will be maintained privately by the property owner. Core Requirement #7: Financial Guarantees and Liability Financial guarantees are not anticipated to be required by the City of Federal Way. Core Requirement #8: Water Quality The project will be exempt from the requirement to provide basic water quality treatment since less than 5,000 square feet of new or replaced pollution-generating impervious surface (PGIS) is proposed. 4 | Page Core Requirement #9: Flow Control BMPs This project will be constructed on a lot smaller than 22,000 square feet and inside the Urban Growth Area and will, therefore, be subject to Small Lot BMP Requirements, as discussed in Section 1.2.9.2.2 of the 2016 KCSWDM. This project will implement the BMPs found in the above listed section. Special Requirement #1: Other Adopted Area-Specific Requirements There are no known area-specific special requirements that apply to this project site. Special Requirement #2: Flood Hazard Area Delineations There are no known flood hazard areas on or adjacent to this project. Special Requirement #3: Flood Protection Facilities Flood protection facility special requirements do not apply to this project. The project does not propose to construct a new or modify an existing flood protection facility. Special Requirement #4: Source Controls Since the proposed project is a single family lot subdivision, source control measures are not anticipated to be required in conjunction with this project. There is no proposed outside-use or storage of pollutants. Special Requirement #5: Oil Control The proposed project does not require oil control measurements. The site is not considered high-use since it is a single family lot subdivision. 3.0 OFF-SITE ANALYSIS Downstream Basin of Threshold Discharge Area: A Level 1 downstream analysis was completed for this project in January of 2020; a map is provided in Appendix E. The overall natural slope of the property is towards the south and west edge of the property. From there, runoff flows in a westerly direction to 25 th Avenue South West, through the vegetation on the neighboring properties. From there, runoff is conveyed north through the public storm drain system. The flow runs under 25 th Avenue South to Southwest 344th Street. There the flow is conveyed west to West 27 th Avenue South West 5 | Page where it flows north. The runoff continues to flow north under 27 th Avenue South West through the public storm conveyance system until it reaches a quarter of a mile downstream from the project site. The developed site will contain new threshold discharge areas on the two new subdivided lots, including new driveways, houses, frontage improvements, and surrounding landscaping. Runoff from these areas will be mitigated through basic dispersion systems and will flow south and west to the public storm drain system where it will be conveyed north until it reaches a quarter of a mile downstream from the project site. There are no applicable drainage complaints known to exist that affect the properties adjacent to the downstream path of the runoff from the project site. There are two complaints that have been closed. Both are Type C complaints (1982-0336 & 1983-0342), which are more than 10 years old. From a review of the information available relating to the downstream system, there did not appear to be any existing significant erosion or flooding problems and no significant problems are anticipated to the improvements proposed as part of this project. Upstream Tributary Basin: There are no known concentrated sources of stormwater discharge to this property. 4.0 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN The City of Federal Way’s Flow Control Applications Map identifies the project site as a part of a Conservation Flow Control area. The proposed on-site conveyance system has been designed to meet City standards as outlined under Core Requirement #4 in the Conditions and Requirements Summary section of this report. Flow Control Systems This project is a subdivision of a single-family lot into two smaller lots. The subdivided lots have different proposed maximum impervious areas. However, for the purposes of this report the subdivided lots have been modeled together in WWHM as a single lot with a bypass of the frontage improvements. A WWHM analysis of the historic and developed surfaces has been completed and included with this report. This analysis shows that the 15-minute, 100-year peak flow rate under historic conditions (forest on type C soils) from the area that will be 6 | Page disturbed by this project will not be surpassed by the 100-year peak flow rate under developed conditions by more than 0.15 cfs. This project is, therefore, exempt from providing flow control facilities. Analysis credits from Table 1.2.9.A of the KCSWDM were applied to the analysis. The analysis of this subdivision assumes the implementation of individual lot BMPs in order to receive modeling credits for this subdivision. This project uses basic dispersion BMPs to mitigate the runnof from the target surfaces. As allowed in Table 1.2.9.A of the 2016 KCSWDM credits for these BMPs have been appled as follows: under developed conditions, the portions of the property that will be disturbed for construction will be covered by 5,313 square feet of roof (0.122 acres, modeled as 90% impervious, 10% lawn on type C soils, flat), 1,256 square feet of driveway (0.029 acres, modeled as 90% impervious, 10% lawn on type C soils, flat), 382 square feet of driveway bypassed (0.009 acres, modeled as impervious, flat), and 8,164 square feet of total lawn and landscaping (0.187 acres, modeled as 100% lawn on type C soils, flat). The table below summarizes the inputs to the WWHM model for this project. TABLE 2 – MITIGATED AREAS WWHM Inputs Total (ac) Modeled as Impervious (ac) Lawn (ac) Pasture (ac) Forest (ac) Off-Site (Bypass) Driveway 0.0090 0.0090 0.0000 0.0000 0.0000 Sidewalk 0.0000 0.0000 0.0000 0.0000 0.0000 Landscaping 0.0110 0.0000 0.0110 0.0000 0.0000 Totals 0.0200 0.0090 0.0110 0.0000 0.0000 On-Site Roof 0.1222 0.1100 0.0122 0.0000 0.0000 Driveway 0.0289 0.0260 0.0029 0.0000 0.0000 Landscaping 0.1759 0.0000 0.1759 0.0000 0.0000 Totals 0.327 0.1360 0.1910 0.0000 0.0000 This results in a 15-minute, 100-year peak flow of 0.1754 cfs. This is less than a 0.15 cfs increase over the predeveloped 15-minute, 100-year peak of 0.0268 cfs. This project is, therefore, exempt from providing additional flow control facilities. Detailed WWHM results are included in Appendix F. BMPs Section 1.2.9.3.1 of the KCSWDM requires that a subdivision project within the UGA and which is on a lot that has a size less than 22,000 square feet must either demonstrate compliance with the LID Performance Standard or implement BMPs on the property in the order identified in the Small Lot BMPs list in Section 1.2.9.2.1 to comply with Core 7 | Page Requirement #9. This project will implement BMPs from the list in Section 1.2.9.2.1 to the greatest extent feasible. Full Dispersion: Full Dispersion BMPs are not feasible. The site does not have the available space for the required 100-foot native vegetative flowpath. For this reason, Full Dispersion BMPs are not feasible per Section C.2.1.1 of the KCSWDM. Full and limited infiltration: Infiltration BMPs are not feasible. The NRCS web soil survey indicates the presence of Alderwood, gravely sandy loam and glacial till. For this reason, Infiltration BMPs are not feasible per Section C.2.2 nor C.2.3 of the KCSWDM. Bioretention: Bioretention BMPs are not feasible. The project site is lacking in usable space for the implementation of this BMP. Also, the NRCS web soil survey indicates the presence of Alderwood, gravely sandy loam and glacial till. For this reason, Bioretention BMPs are not feasible per Section C.2.6 of the KCSWDM. Permeable Pavement: Permeable Pavement BMPs are not feasible. The NRCS web soil survey indicates the presence of Alderwood, gravely sandy loam and glacial till. For this reason, Bioretention BMPs are not feasible per Section C.2.7 of the KCSWDM. Basic Dispersion: Basic Dispersion BMPs are feasible. The runoff from the proposed impervious areas will be applied per Section C.2.4 of the KCSWDM. The roof area for each lot will be mitigated with a dispersion trench located to the rear of the proposed residences, with allowance for a 25-foot flow path. It is expected that the dispersion trenches will mitigate the proposed 2760 square feet of roof on Lot 1 and 2,552 square feet of roof on Lot 2. On Lot 1, 39.4 feet of trench is required to mitigate the proposed roof at a rate of 700 square feet per 10 lineal feet of trench. On Lot 2, 36.5 feet of trench is required to mitigate the proposed roof at a rate of 700 square feet per 10 lineal feet of trench. The runoff from the driveways of each lot will be mitigated with sheet flow dispersion. The proposed driveways are 24-feet wide which require a flow path of 12- feet at a rate of 20 lineal feet per 10 lineal feet of driveway over 20-feet, per Section C.2.4.5 of the KCSWDM. Since the project will apply, to the greatest extent feasible, BMPs to the target impervious surfaces, the project will meet the conditions of Core Requirement #9; for which BMPs must be applied to all new impervious surfaces, where feasible and applicable, for a project site per Section 1.2.9.2.3 of the KCSWDM. Single family residences and other improvements constructed on the lots created by this subdivision must implement the flow control best management practices (BMPs) stipulated in the drainage plan declaration of covenant and grant of easement recorded for each lot. Compliance with this stipulation must be addressed in the small project 8 | Page drainage plan submitted for drainage review when application is made for a single- family residential building permit for the lot. Water Quality System The City of Federal Way’s Water Quality Applications Map identifies the project site as a part of an Enhanced Basic Water Quality Treatment review area. This project is exempt from providing water quality treatment because there will be less than 5,000 square feet of PGIS. 5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN Conveyance pipes for this project will consist of 4-inch pipes to the dispersion trenches. These pipes are adequately sized to handle the flows that are anticipated from this project. 6.0 SPECIAL REPORTS AND STUDIES Any relevant additional studies will be included in the final TIR. 7.0 OTHER PERMITS Building permits and side sewer permits will be required for the new residences. A water service connection permit will be required for Lot 2. 8.0 ESC ANALYSIS AND DESIGN Erosion and sediment control requirements will include the delineation of clearing limits via flagging, proper cover measures for the protection of disturbed areas, perimeter protection with silt fencing on an as-needed basis, and a stabilized construction entrance per the City of Federal Way standards. The Erosion and Sediment Control Plan will be included as part of the final engineering construction plans. 9.0 BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT A bond is not expected to be required by the City for this single-family project. 10.0 OPERATIONS AND MAINTENANCE MANUAL The on-site dispersion systems and associated elements will be maintained privately by the property owner. The operations and maintenance details for the private facilities will be provided in the Operations and Maintenance Manual that is included in the final TIR and found in Appendix D. APPENDIX A: SOIL INFORMATION 6RLO0DS²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²6HS7KHRUWKRSKRWRRURWKHUEDVHPDSRQZKLFKWKHVRLOOLQHVZHUHFRPSLOHGDQGGLJLWL]HGSUREDEO\GLIIHUVIURPWKHEDFNJURXQGLPDJHU\GLVSOD\HGRQWKHVHPDSV$VDUHVXOWVRPHPLQRUVKLIWLQJRIPDSXQLWERXQGDULHVPD\EHHYLGHQW6RLO0DS².LQJ&RXQW\$UHD:DVKLQJWRQ1DWXUDO5HVRXUFHV&RQVHUYDWLRQ6HUYLFH:HE6RLO6XUYH\1DWLRQDO&RRSHUDWLYH6RLO6XUYH\3DJHRI APPENDIX B: DRAINAGE PLAN XXXXXXXXXXXSSSSSSSSDATEDESCRIPTIONSYM.㻯㻝 346TH STREET FEDERAL WAY, WA43211REGISTEREDSTATE OF WASHINGT O N ADAM E. PAU L CONSULTINGENGINEERS PLLCAPxx.xxxx.xxPXC:\Users\matth\Dropbox\APCE\2019068 - Butko Lot 14 Short Plat\Civil Drawings\C1-19068.Site Plan.dwg, Paper, 7/23/2021 10:44:57 AM, Matthew APPENDIX C: EROSION AND SEDIMENT CONTROL FFFFFFFFFFFFFF FFFFFFFFFFDATEDESCRIPTIONSYM.㻯㻞24XX SW 346TH STREET FEDERAL WAY, WACONSULTINGENGINEERS PLLCAP43211REGISTEREDSTATE OF WASHINGT O N ADAM E. PAU L C:\Users\matth\Dropbox\APCE\2019068 - Butko Lot 14 Short Plat\Civil Drawings\C2 - 19068.TESC Plan.dwg, Paper, 7/23/2021 10:42:48 AM, Matthew APPENDIX D: OPERATIONS AND MAINTENANCE MANUAL BUTKO LOT 14 SHORT PLAT STORM DRAINAGE FACILITIES OPERATION AND MAINTENANCE MANUAL This Operation and Maintenance Manual is for the stormwater facilities serving the single-family residences located on Lot 1 and Lot 2 of the Butko Lot 14 Short Plat for parcel number 0114700140. The purpose of the stormwater facilities is to provide management of stormwater runoff generated by the residences and the proposed driveways. The storm drainage dispersion facilities for this project include a tightline connection from the roof downspouts and sloped driveways to the dispersion facilities. The dispersion facilities will disperse runoff from the roof and the new driveway on the property. A catch basin will be installed between the roof downspouts and the dispersion facility to provide a point for some trash and any other substances that could clog the systems to be removed from the runoff. Sediment and trash should be prevented from entering the dispersion facilities to keep the rock and native soils from clogging. The following pages identify and describe the maintenance tasks associated with the storm drainage facilities. This Operation and Maintenance Manual shall be kept on the premises of the home and must be made available for inspection by the City of Federal Way. The operation and maintenance of the storm drainage facilities will be the responsibility of the home owner. Long-term maintenance shall be performed as described hereinafter. All conveyance systems shall be inspected for sediment and blockages on an annual basis or after large storm events. Catch basin sumps shall be removed of sediment and debris on an annual basis or if a blockage occurs. The main contributors of sediment to the storm system are total suspended solids (TSS) and detritus from trees. The debris collected shall be placed in the trash, not the roadway catch basins. Long-term maintenance of the storm drainage system shall be completed in accordance with the following checklists. Instructions for Use of Maintenance Checklists The following pages contain maintenance needs for most of the components that are part of your drainage system, as well as for some components that you may not have. Ignore requirements that do not apply to your system. You should plan to complete a checklist for all system components on the following schedule: 1. Monthly from November through April. 2. Once in late summer (preferably in September). 3. After any major storm (use 1-inch in 24-hours as a guideline), for items marked “S” only. Using photocopies of the checklist pages, check off the problems that you looked for each time you conducted an inspection. Add comments on problems found and remedy actions taken. Keep these “checked” sheets in your records. Some items do not need to be looked at every time an inspection is done. Use the suggested frequency at the left of each item as a guideline for your inspection. MAINTENANCE INSTRUCTIONS FOR BASIC DISPERSION Your property contains a stormwater management flow control BMP (best management practice) called "basic dispersion,"which was installed to mitigate the stormwater quantity and quality impacts of some or all of the impervious surfaces or non-native pervious surfaces on your property. Basic dispersion is a strategy for utilizing any available capacity of onsite vegetated areas to retain, absorb, and filter the runoff from developed surfaces. This flow control BMP has two primary components that must be maintained: (1) the devices that disperse runoff from the developed surfaces and (2) the vegetated area over which runoff is dispersed. Dispersion Devices The dispersion devices used on your property include the following as indicated on the flow control BMP site plan (CHECK THE BOX(ES) THAT APPLY): splash blocks, rock pads, gravel filled trenches, sheet flow. MAINTENANCE RESTRICTIONS The size, placement, composition, and downstream flowpaths of these devices as depicted by the flow control BMP site plan and design details must be maintained and may not be changed without written approval either from the King County Water and Land Resources Division or through a future development permit from King County. INSPECTION FREQUENCY AND MAINTENANCE GUIDELINES This flow control BMP has two primary components that must be maintained: (1) the devices that disperse runoff from the developed surfaces and (2) the vegetated flowpath area over which runoff is dispersed. Maintenance of Dispersion Devices x Dispersion devices must be inspected annually and after major storm events to identify and repair any physical defects. x When native soil is exposed or erosion channels are present, the sources of the erosion or concentrated flow need to be identified and mitigated. x Concentrated flow can be mitigated by leveling the edge of the pervious area and/or realigning or replenishing the rocks in the dispersion device, such as in rock pads and gravel filled trenches. Maintenance of Vegetated Flowpaths x The vegetated area over which runoff is dispersed must be maintained in good condition free of bare spots and obstructions that would concentrate flows. RECORDING REQUIREMENT These basic dispersion flow control BMP maintenance and operation instructions must be recorded as an attachment to the required declaration of covenant and grant of easement per Requirement 3 of Section C.1.3.4 of the King County Surface Water Design Manual. The intent of these instructions is to explain to future property owners, the purpose of the BMP and how it must be maintained and operated. These instructions are intended to be a minimum; the King County Department of Permitting and Environmental Services (DPER) may require additional instructions based on site-specific conditions. See King County’s Surface Water Design Manual website for additional information and updates. APPENDIX A MAINTENANCE REQUIREMENTS FOR FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES NO. 5 – CATCH BASINS AND MANHOLES Maintenance Component Defect or Problem Condition When Maintenance is Needed Results Expected When Maintenance is Performed Structure Sediment Sediment exceeds 60% of the depth from the bottom of the catch basin to the invert of the lowest pipe into or out of the catch basin or is within 6 inches of the invert of the lowest pipe into or out of the catch basin. Sump of catch basin contains no sediment. Trash and debris Trash or debris of more than ½ cubic foot which is located immediately in front of the catch basin opening or is blocking capacity of the catch basin by more than 10%. No Trash or debris blocking or potentially blocking entrance to catch basin. Trash or debris in the catch basin that exceeds 1/3 the depth from the bottom of basin to invert the lowest pipe into or out of the basin. No trash or debris in the catch basin. Dead animals or vegetation that could generate odors that could cause complaints or dangerous gases (e.g., methane). No dead animals or vegetation present within catch basin. Deposits of garbage exceeding 1 cubic foot in volume. No condition present which would attract or support the breeding of insects or rodents. Damage to frame and/or top slab Corner of frame extends more than ¾ inch past curb face into the street (If applicable). Frame is even with curb. Top slab has holes larger than 2 square inches or cracks wider than ¼ inch. Top slab is free of holes and cracks. Frame not sitting flush on top slab, i.e., separation of more than ¾ inch of the frame from the top slab. Frame is sitting flush on top slab. Cracks in walls or bottom Cracks wider than ½ inch and longer than 3 feet, any evidence of soil particles entering catch basin through cracks, or maintenance person judges that catch basin is unsound. Catch basin is sealed and is structurally sound. Cracks wider than ½ inch and longer than 1 foot at the joint of any inlet/outlet pipe or any evidence of soil particles entering catch basin through cracks. No cracks more than 1/4 inch wide at the joint of inlet/outlet pipe. Settlement/ misalignment Catch basin has settled more than 1 inch or has rotated more than 2 inches out of alignment. Basin replaced or repaired to design standards. Damaged pipe joints Cracks wider than ½-inch at the joint of the inlet/outlet pipes or any evidence of soil entering the catch basin at the joint of the inlet/outlet pipes. No cracks more than ¼-inch wide at the joint of inlet/outlet pipes. Contaminants and pollution Any evidence of contaminants or pollution such as oil, gasoline, concrete slurries or paint. Materials removed and disposed of according to applicable regulations. Source control BMPs implemented if appropriate. No contaminants present other than a surface oil film. Inlet/Outlet Pipe Sediment accumulation Sediment filling 20% or more of the pipe. Inlet/outlet pipes clear of sediment. Trash and debris Trash and debris accumulated in inlet/outlet pipes (includes floatables and non-floatables). No trash or debris in pipes. Damaged Cracks wider than ½-inch at the joint of the inlet/outlet pipes or any evidence of soil entering at the joints of the inlet/outlet pipes. No cracks more than ¼-inch wide at the joint of the inlet/outlet pipe. 2016 Surface Water Design Manual – Appendix A 4/24/2016 A-9 APPENDIX A MAINTENANCE REQUIREMENTS FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES NO. 5 – CATCH BASINS AND MANHOLES Maintenance Component Defect or Problem Condition When Maintenance is Needed Results Expected When Maintenance is Performed Metal Grates (Catch Basins) Unsafe grate opening Grate with opening wider than 7/8 inch. Grate opening meets design standards. Trash and debris Trash and debris that is blocking more than 20% of grate surface. Grate free of trash and debris. footnote to guidelines for disposal Damaged or missing Grate missing or broken member(s) of the grate. Any open structure requires urgent maintenance. Grate is in place and meets design standards. Manhole Cover/Lid Cover/lid not in place Cover/lid is missing or only partially in place. Any open structure requires urgent maintenance. Cover/lid protects opening to structure. Locking mechanism Not Working Mechanism cannot be opened by one maintenance person with proper tools. Bolts cannot be seated. Self-locking cover/lid does not work. Mechanism opens with proper tools. Cover/lid difficult to Remove One maintenance person cannot remove cover/lid after applying 80 lbs. of lift. Cover/lid can be removed and reinstalled by one maintenance person. 4/24/2016 2016 Surface Water Design Manual – Appendix A A-10 APPENDIX A MAINTENANCE REQUIREMENTS FOR FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES NO. 6 – CONVEYANCE PIPES AND DITCHES Maintenance Component Defect or Problem Conditions When Maintenance is Needed Results Expected When Maintenance is Performed Pipes Sediment & debris accumulation Accumulated sediment or debris that exceeds 20% of the diameter of the pipe. Water flows freely through pipes. Vegetation/roots Vegetation/roots that reduce free movement of water through pipes. Water flows freely through pipes. Contaminants and pollution Any evidence of contaminants or pollution such as oil, gasoline, concrete slurries or paint. Materials removed and disposed of according to applicable regulations. Source control BMPs implemented if appropriate. No contaminants present other than a surface oil film. Damage to protective coating or corrosion Protective coating is damaged; rust or corrosion is weakening the structural integrity of any part of pipe. Pipe repaired or replaced. Damaged Any dent that decreases the cross section area of pipe by more than 20% or is determined to have weakened structural integrity of the pipe. Pipe repaired or replaced. Ditches Trash and debris Trash and debris exceeds 1 cubic foot per 1,000 square feet of ditch and slopes. Trash and debris cleared from ditches. Sediment accumulation Accumulated sediment that exceeds 20% of the design depth. Ditch cleaned/flushed of all sediment and debris so that it matches design. Noxious weeds Any noxious or nuisance vegetation which may constitute a hazard to County personnel or the public. Noxious and nuisance vegetation removed according to applicable regulations. No danger of noxious vegetation where County personnel or the public might normally be. Contaminants and pollution Any evidence of contaminants or pollution such as oil, gasoline, concrete slurries or paint. Materials removed and disposed of according to applicable regulations. Source control BMPs implemented if appropriate. No contaminants present other than a surface oil film. Vegetation Vegetation that reduces free movement of water through ditches. Water flows freely through ditches. Erosion damage to slopes Any erosion observed on a ditch slope. Slopes are not eroding. Rock lining out of place or missing (If Applicable) One layer or less of rock exists above native soil area 5 square feet or more, any exposed native soil. Replace rocks to design standards. 2016 Surface Water Design Manual – Appendix A 4/24/2016 A-11 APPENDIX A MAINTENANCE REQUIREMENTS FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES NO. 27 – GRAVEL FILLED DISPERSION TRENCH BMP Maintenance Component Defect or Problem Conditions When Maintenance is Needed Results Expected When Maintenance is Performed Preventative Blocking, obstructions Debris or trash limiting flow to dispersion trench or preventing spreader function. Dispersion trench able to receive full flow prior to and during wet season. Site Trash and debris Trash or debris that could end up in the dispersion trench is evident. No trash or debris that could get into the dispersion trench can be found. Pipes Inlet is plugged The entrance to the pipe is restricted due to sediment, trash, or debris. The entrance to the pipe is not restricted. Vegetation/roots Vegetation/roots that reduce free movement of water through pipes. Water flows freely through pipes. Plugged Sediment or other material prevents free flow of water through the pipe. Water flows freely through pipes. Broken joint or joint leaks. Damage to the pipe or pipe joints allowing water to seep out. Pipe does not allow water to exit other than at the outlet to the trench. Cleanout caps Cleanout caps are broken, missing, or buried. Cleanout caps are accessible and intact. Structure Flow not reaching trench Flows are not getting into the trench as designed. Water enters and exits trench as designed. Perforated pipe plugged Flow not able to enter or properly exit from perforated pipe. Water freely enters and exits perforated pipe. Flow not spreading evenly at outlet of trench Outlet flows channelizing or not spreading evenly from trench. Sheet flow occurs at the outlet of the trench. Cleanout/inspection access does not allow cleaning or inspection of perforated pipe The cleanout/inspection access is not available. Cleanout/inspection access is available. Filter Media Filter media plugged Filter media plugged. Flow through filter media is normal. Inspection Frequency Annually and prior to and following significant storms. Inspect dispersion trench system for any defects of deficiencies. 4/24/2016 2016 Surface Water Design Manual – Appendix A A-36 APPENDIX A MAINTENANCE REQUIREMENTS FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES NO. 32 – RAINWATER HARVESTING BMP Maintenance Component Defect or Problem Conditions When Maintenance is Needed Results Expected When Maintenance is Performed Preventative Storage volume No rain water in storage unit at the beginning of the rain season. Maximum storage available at the beginning of the rain season (Oct. 1st). Collection Area Trash and debris Trash of debris on collection area may plug filter system Collection area clear of trash and debris. Filter Restricted or plugged Filter is partially or fully plugged preventing water from getting in to the storage unit. Filter is allowing collection water into storage unit. Inspection Frequency Annually and after large storms Rain harvesting equipment is functioning normally. Maintenance log A Maintenance log must be kept and available for review by KC staff. Maintenance log is kept and is available to KC staff. NO. 33 – ROCK PAD BMP Maintenance Component Defect or Problem Conditions When Maintenance is Needed Results Expected When Maintenance is Performed Site Trash and debris Trash and debris accumulated on rock pad site. Rock pad site free of any trash or debris. Rock Pad Area Rock pad size Rock pad is not 2 feet by 3 feet by 6 inches thick or as designed. Rock pad is 2 feet by 3 feet by 6 inches thick or as designed. Vegetation Vegetation is seen growing in or through rock pad. No vegetation within rock pad area. Rock Exposed soil Soil can be seen through the rock pad. Full thickness of the rock pad is in place, no soil visible through rock pad. Inspection Frequency Annually and after large storms Rock pad is functioning normally. NO. 34 – SHEET FLOW BMP Maintenance Component Defect or Problem Conditions When Maintenance is Needed Results Expected When Maintenance is Performed Site Trash and debris Trash and debris accumulated on the sheet flow site. Sheet flow site free of any trash or debris. Sheet flow area Erosion Soil erosion occurring in sheet flow zone. Soil erosion is not occurring and rills and channels have been repaired. Concentrated flow Sheet flow is not occurring in the sheet flow zone. Sheet flow area is regraded to provide sheet flow. Inspection Frequency Annually and after large storms Rain harvesting equipment is functioning normally. 4/24/2016 2016 Surface Water Design Manual – Appendix A A-40 APPENDIX E: DOWNSTREAM ANALYSIS 1,367.9 ft199.8 ft199.8 ft578.7 ft578.7 ft271.6 ft271.6 ft186.0 ft186.0 ft131.9 ftKing CountyKing County iMapDate: 2/3/2020 Notes:The information included on this map has been compiled by King County staff from a variety of sources and is subject to changewithout notice. King County makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness,or rights to the use of such information. This document is not intended for use as a survey product. King County shall not be liablefor any general, special, indirect, incidental, or consequential damages including, but not limited to, lost revenues or lost profitsresulting from the use or misuse of the information contained on this map. Any sale of this map or information on this map isprohibited except by written permission of King County.±Project Siteelevation 435.0'Enters catch basin of public stormsystem under 25th Ave SWEnd 1/4 mi from site inpublic storm system of27th Ave SW APPENDIX F: DRAINAGE CALCULATIONS WWHM2012 PROJECT REPORT new 7/23/2021 8:57:16 AM Page 2 General Model Information Project Name: new Site Name: Butko Lot 14 SP Site Address: City: Report Date: 7/23/2021 Gage: Seatac Data Start: 1948/10/01 Data End: 2009/09/30 Timestep: 15 Minute Precip Scale: 1.000 Version Date: 2019/09/13 Version: 4.2.17 POC Thresholds Low Flow Threshold for POC1: 50 Percent of the 2 Year High Flow Threshold for POC1: 50 Year new 7/23/2021 8:57:16 AM Page 3 Landuse Basin Data Predeveloped Land Use Basin 1 Bypass: No GroundWater: No Pervious Land Use acre C, Forest, Flat 0.327 Pervious Total 0.327 Impervious Land Use acre Impervious Total 0 Basin Total 0.327 Element Flows To: Surface Interflow Groundwater new 7/23/2021 8:57:16 AM Page 4 Bypass Bypass: No GroundWater: No Pervious Land Use acre C, Forest, Flat 0.02 Pervious Total 0.02 Impervious Land Use acre Impervious Total 0 Basin Total 0.02 Element Flows To: Surface Interflow Groundwater new 7/23/2021 8:57:16 AM Page 5 Mitigated Land Use Basin 1 Bypass: No GroundWater: No Pervious Land Use acre C, Lawn, Flat 0.191 Pervious Total 0.191 Impervious Land Use acre ROOF TOPS FLAT 0.11 DRIVEWAYS FLAT 0.026 Impervious Total 0.136 Basin Total 0.327 Element Flows To: Surface Interflow Groundwater new 7/23/2021 8:57:16 AM Page 6 bypass Bypass: No GroundWater: No Pervious Land Use acre C, Lawn, Flat 0.011 Pervious Total 0.011 Impervious Land Use acre DRIVEWAYS FLAT 0.009 Impervious Total 0.009 Basin Total 0.02 Element Flows To: Surface Interflow Groundwater new 7/23/2021 8:57:16 AM Page 7 Routing Elements Predeveloped Routing new 7/23/2021 8:57:16 AM Page 8 Mitigated Routing new 7/23/2021 8:57:16 AM Page 9 Analysis Results POC 1 + Predeveloped x Mitigated Predeveloped Landuse Totals for POC #1 Total Pervious Area: 0.347 Total Impervious Area: 0 Mitigated Landuse Totals for POC #1 Total Pervious Area: 0.202 Total Impervious Area: 0.145 Flow Frequency Method: Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.010202 5 year 0.016023 10 year 0.019321 25 year 0.022816 50 year 0.024979 100 year 0.026818 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.069105 5 year 0.093903 10 year 0.111724 25 year 0.135884 50 year 0.155105 100 year 0.175401 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1949 0.010 0.101 1950 0.012 0.097 1951 0.022 0.062 1952 0.007 0.042 1953 0.006 0.046 1954 0.009 0.056 1955 0.014 0.060 1956 0.011 0.060 1957 0.009 0.076 1958 0.010 0.053 new 7/23/2021 8:57:47 AM Page 10 1959 0.009 0.047 1960 0.015 0.066 1961 0.009 0.063 1962 0.005 0.047 1963 0.007 0.061 1964 0.010 0.055 1965 0.007 0.081 1966 0.007 0.046 1967 0.014 0.098 1968 0.009 0.094 1969 0.008 0.073 1970 0.007 0.064 1971 0.007 0.077 1972 0.017 0.096 1973 0.008 0.041 1974 0.008 0.074 1975 0.011 0.078 1976 0.008 0.057 1977 0.001 0.054 1978 0.007 0.066 1979 0.004 0.082 1980 0.016 0.111 1981 0.006 0.069 1982 0.012 0.113 1983 0.011 0.074 1984 0.007 0.051 1985 0.004 0.070 1986 0.018 0.063 1987 0.016 0.084 1988 0.006 0.047 1989 0.004 0.059 1990 0.033 0.174 1991 0.020 0.126 1992 0.008 0.051 1993 0.008 0.040 1994 0.003 0.039 1995 0.011 0.060 1996 0.024 0.081 1997 0.020 0.073 1998 0.005 0.060 1999 0.019 0.150 2000 0.008 0.069 2001 0.001 0.064 2002 0.009 0.100 2003 0.011 0.078 2004 0.014 0.137 2005 0.010 0.064 2006 0.012 0.059 2007 0.024 0.158 2008 0.031 0.124 2009 0.015 0.077 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 0.0327 0.1745 2 0.0313 0.1577 3 0.0243 0.1500 new 7/23/2021 8:57:47 AM Page 11 4 0.0239 0.1373 5 0.0225 0.1261 6 0.0200 0.1237 7 0.0197 0.1133 8 0.0187 0.1111 9 0.0177 0.1009 10 0.0167 0.1004 11 0.0159 0.0976 12 0.0156 0.0967 13 0.0154 0.0957 14 0.0152 0.0943 15 0.0143 0.0836 16 0.0140 0.0824 17 0.0139 0.0808 18 0.0125 0.0806 19 0.0122 0.0781 20 0.0121 0.0779 21 0.0113 0.0771 22 0.0112 0.0766 23 0.0112 0.0762 24 0.0110 0.0740 25 0.0109 0.0736 26 0.0102 0.0729 27 0.0101 0.0725 28 0.0100 0.0702 29 0.0096 0.0694 30 0.0090 0.0694 31 0.0088 0.0660 32 0.0087 0.0655 33 0.0087 0.0641 34 0.0086 0.0639 35 0.0086 0.0635 36 0.0085 0.0627 37 0.0082 0.0626 38 0.0081 0.0624 39 0.0079 0.0608 40 0.0079 0.0603 41 0.0076 0.0603 42 0.0076 0.0602 43 0.0075 0.0601 44 0.0073 0.0589 45 0.0071 0.0585 46 0.0071 0.0571 47 0.0070 0.0558 48 0.0069 0.0550 49 0.0067 0.0537 50 0.0066 0.0531 51 0.0063 0.0513 52 0.0062 0.0509 53 0.0057 0.0470 54 0.0053 0.0468 55 0.0045 0.0466 56 0.0043 0.0463 57 0.0040 0.0455 58 0.0040 0.0422 59 0.0027 0.0406 60 0.0014 0.0403 61 0.0010 0.0390 new 7/23/2021 8:57:47 AM Page 12 new 7/23/2021 8:57:47 AM Page 13 Duration Flows Flow(cfs) Predev Mit Percentage Pass/Fail 0.0051 17545 96357 549 Fail 0.0053 16164 92229 570 Fail 0.0055 14966 88272 589 Fail 0.0057 13851 84529 610 Fail 0.0059 12810 81085 632 Fail 0.0061 11811 77791 658 Fail 0.0063 10900 74711 685 Fail 0.0065 10119 71738 708 Fail 0.0067 9383 68979 735 Fail 0.0069 8729 66241 758 Fail 0.0071 8145 63696 782 Fail 0.0073 7593 61236 806 Fail 0.0075 7060 58905 834 Fail 0.0077 6588 56659 860 Fail 0.0079 6145 54520 887 Fail 0.0081 5777 52488 908 Fail 0.0083 5431 50563 931 Fail 0.0085 5097 48724 955 Fail 0.0087 4808 47013 977 Fail 0.0089 4524 45301 1001 Fail 0.0091 4252 43697 1027 Fail 0.0093 4017 42179 1050 Fail 0.0095 3782 40746 1077 Fail 0.0097 3546 39248 1106 Fail 0.0099 3337 37858 1134 Fail 0.0101 3138 36596 1166 Fail 0.0103 2952 35334 1196 Fail 0.0105 2787 34201 1227 Fail 0.0107 2599 33046 1271 Fail 0.0109 2449 31912 1303 Fail 0.0111 2308 30864 1337 Fail 0.0113 2162 29837 1380 Fail 0.0115 2029 28853 1422 Fail 0.0117 1903 27870 1464 Fail 0.0119 1790 26971 1506 Fail 0.0121 1694 26116 1541 Fail 0.0123 1594 25303 1587 Fail 0.0125 1483 24426 1647 Fail 0.0127 1379 23635 1713 Fail 0.0129 1292 22865 1769 Fail 0.0131 1220 22180 1818 Fail 0.0133 1155 21474 1859 Fail 0.0135 1098 20794 1893 Fail 0.0137 1049 20125 1918 Fail 0.0139 997 19504 1956 Fail 0.0141 930 18880 2030 Fail 0.0143 884 18328 2073 Fail 0.0145 839 17766 2117 Fail 0.0147 790 17250 2183 Fail 0.0149 743 16720 2250 Fail 0.0151 713 16247 2278 Fail 0.0153 668 15740 2356 Fail 0.0155 630 15261 2422 Fail 0.0157 596 14840 2489 Fail new 7/23/2021 8:57:47 AM Page 14 0.0159 566 14403 2544 Fail 0.0161 539 13971 2592 Fail 0.0163 497 13573 2730 Fail 0.0165 473 13180 2786 Fail 0.0167 436 12765 2927 Fail 0.0169 401 12386 3088 Fail 0.0171 369 12021 3257 Fail 0.0173 348 11702 3362 Fail 0.0175 324 11375 3510 Fail 0.0178 296 11043 3730 Fail 0.0180 272 10726 3943 Fail 0.0182 256 10423 4071 Fail 0.0184 235 10132 4311 Fail 0.0186 217 9839 4534 Fail 0.0188 197 9580 4862 Fail 0.0190 180 9317 5176 Fail 0.0192 158 9086 5750 Fail 0.0194 145 8846 6100 Fail 0.0196 129 8622 6683 Fail 0.0198 119 8395 7054 Fail 0.0200 109 8173 7498 Fail 0.0202 97 7969 8215 Fail 0.0204 91 7781 8550 Fail 0.0206 82 7561 9220 Fail 0.0208 76 7381 9711 Fail 0.0210 69 7184 10411 Fail 0.0212 61 6986 11452 Fail 0.0214 54 6791 12575 Fail 0.0216 48 6628 13808 Fail 0.0218 41 6453 15739 Fail 0.0220 38 6271 16502 Fail 0.0222 33 6115 18530 Fail 0.0224 27 5925 21944 Fail 0.0226 22 5760 26181 Fail 0.0228 21 5612 26723 Fail 0.0230 20 5484 27420 Fail 0.0232 19 5354 28178 Fail 0.0234 17 5219 30700 Fail 0.0236 14 5103 36450 Fail 0.0238 12 4986 41550 Fail 0.0240 9 4881 54233 Fail 0.0242 4 4753 118825 Fail 0.0244 3 4620 154000 Fail 0.0246 3 4509 150300 Fail 0.0248 3 4387 146233 Fail 0.0250 3 4267 142233 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. new 7/23/2021 8:57:47 AM Page 15 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. new 7/23/2021 8:57:47 AM Page 16 LID Report new 7/23/2021 8:57:56 AM Page 17 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. new 7/23/2021 8:57:56 AM Page 18 Appendix Predeveloped Schematic new 7/23/2021 8:57:57 AM Page 19 Mitigated Schematic new 7/23/2021 8:57:57 AM Page 20 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 new.wdm MESSU 25 Prenew.MES 27 Prenew.L61 28 Prenew.L62 30 POCnew1.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 Basin 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 *** 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 new 7/23/2021 8:57:57 AM Page 21 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 new 7/23/2021 8:57:57 AM Page 22 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Basin 1*** PERLND 10 0.327 COPY 501 12 PERLND 10 0.327 COPY 501 13 Bypass*** PERLND 10 0.02 COPY 501 12 PERLND 10 0.02 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-> *** new 7/23/2021 8:57:57 AM Page 23 <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 new 7/23/2021 8:57:57 AM Page 24 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 new.wdm MESSU 25 Mitnew.MES 27 Mitnew.L61 28 Mitnew.L62 30 POCnew1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 16 IMPLND 4 IMPLND 5 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Basin 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 ********* 16 0 0 4 0 0 0 0 0 0 0 0 0 1 9 new 7/23/2021 8:57:57 AM Page 25 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 *** 4 ROOF TOPS/FLAT 1 1 1 27 0 5 DRIVEWAYS/FLAT 1 1 1 27 0 END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** 4 0 0 1 0 0 0 5 0 0 1 0 0 0 END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* 4 0 0 4 0 0 0 1 9 5 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 *** 4 0 0 0 0 0 5 0 0 0 0 0 END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC 4 400 0.01 0.1 0.1 5 400 0.01 0.1 0.1 new 7/23/2021 8:57:57 AM Page 26 END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN 4 0 0 5 0 0 END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS 4 0 0 5 0 0 END IWAT-STATE1 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Basin 1*** PERLND 16 0.191 COPY 501 12 PERLND 16 0.191 COPY 501 13 IMPLND 4 0.11 COPY 501 15 IMPLND 5 0.026 COPY 501 15 bypass*** PERLND 16 0.011 COPY 501 12 PERLND 16 0.011 COPY 501 13 IMPLND 5 0.009 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 new 7/23/2021 8:57:57 AM Page 27 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 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 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 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 new 7/23/2021 8:57:57 AM Page 28 Predeveloped HSPF Message File new 7/23/2021 8:57:57 AM Page 29 Mitigated HSPF Message File new 7/23/2021 8:57:57 AM Page 30 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. 2005-2021; 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