21-101296 -Water System Hydraulic -04-02-2021-V14WD i Lakehaven
WATER & SEWER DISTRICT
Hydraulic Model Fire Flow Estimate
Request/Reporting Form
Requested By:
Federal Way Public Schools
Date:
11/24/2020
Location to be Modeled: Olympic View K-8 School / 1321039008 (Proposed Improvements)
Lakehaven %4 Section Grid:
E/9
intersection:
SW 327t' St & 26th Ave SW
Add. Description:
See attached map
Pressure zone: 538
Results By:
Date:
Model Run No.:
John Bo
12/04/2020
Master Water System Model 2007.net
FF #417
Condition
Pressure (psi)
Flow (gpm)
Static
85
0
Fire Flow
20
4500
NOTES:
Lakehaven's adopted level of service goals for fire flow rates are 1000 gpm within single
family residential areas (including duplexes) and 2500 gpm for multi -family, commercial,
industrial areas.
Model results depict the theoretical performance of the water system under high demand
conditions and are not guaranteed to represent actual system performance. A design
professional should be consulted for site specific design purposes.
The calculated fire flow capacity in the above table is based on a currently available residual
system pressure of 20 psi at the location modeled. The model indicates that Lakehaven's
standard maximum allowable velocity of 10 ft/s is exceeded at a fire flow rate above 2300
gpm. Fire flow capacities greater than 2300 gpm may be accommodated through water
system improvements.
12042OFF 417 - Olyimpic View Elm (Form Update 1/6/17)
The above model run assumed an 8" diameter pipe loop across the property with no off -site
improvements. No hydrant locations were provided, so a test point was assumed near the
center of the property. A portion of the proposed on -site piping also reach the maximum
design velocity for new main of 8 ft/s. To achieve a fire flow greater than the requested
2750 gpm, on -site and off -site improvements would be needed.
Option 1:
On -site mains assumed at 12" diameter. Off -site improvements increased sections A and B
(-530 ft) to 8" diameter.
This run provided a maximum of 3100 gpm without exceeding system velocities (6000 gpm
at 20 psi).
Option 2:
On -site mains assumed at 12" diameter. Off -site improvements increased sections B, C and
D (-630 ft) to 8" diameter.
This run provided a maximum of 2800 gpm without exceeding system velocities (5900 gpm
at 20 psi).
Option 3:
On -site mains assumed at 12" diameter. Off -site improvements increased sections A, D, and
E (-860 ft) to 8" diameter.
This run provided a maximum of 3100 gpm without exceeding system velocities (6000 gpm
at 20 psi).
12042OFF 417 - Olyimpic View Elm (Form Update 1/6/17)
Lakehaven
�87 6,, 932 31,040 93 31 07 932 30 140
,�s 7319 600 87310020 ti t31 055 9324 100 0 51 _ 242
16
3 18
2 19 87 0 0' / 1 25411 87 1800 30 87 1800 3 T7
27 1 8731 0 0 ,� 420 3 01
24
319 70 8731902740 8731920 0 11 y - 0
36
27 8731i0UNKN _ 00 80 2204
731900560 240
0
32142 7 1900 00 8731 6 8731 002 0 6
87�D275
420 Z2 �- � 3 3 "Lake Po ice 32 1 1 32
8319 03 I de Le 8731 0037 0
\ 873 8006 0!
,g 2 32 ` 1 3 235 318 0
90 N °
27 8 45 87318003 0 32
g�� 8„ - 3 322 0 g„11
731 12 � 87 19015203 80 870 73 80 90 323 \ g11
3 05 _ 74 - 73 800 31 004 73 80 070 2 19 --
873 .0386 ' 25 73 01 73 70 0 �,� 261 1, 6 41 8 318 10 0
323 ` 232 28 873 0 12
873 0 6 014 901 323 87 801 00 I
323 26 732501 j 3 660 6 6
87 01 „ 0 --
32 19 FIRE FLOW REQ'T ) 86 00�oi , 600 do 325 5
873 9 = 2,750 GPM FOR
32 5 324 2 4 HOURS�� 6 66 90 6700 0
901 0 3 0 370 2 31 63�8-5-
870 0
1321039008 / 638 60 080 � � 5
8 1 13 �3242 T 0 '�' 53 38 600 2500► 6 8�00410
8731902740 3 423 3Ka — 4'. 3g�j
�731902130 873 0106 F 9
g350 �ti� �p 826 00 0 505324
560 INSTALL NEW E09 65 0 1800
ON -SITE `� �a - 2 50 2 36 896 030 6 156
WATERMAIN LOOP =
.,� « � �o OLYMPIC
(SIZE TBD) 6" VIEW246950
„ , 271 000 xv ELEMENTARY 5 00 10 2 11 6 6
147
59 014 6 800 4
9 1 50
73 89 52 04
3 52 5200 52 001) 27 1 94 62 08C 11 94� 0 44 894 41 06 31 09
II�g_ 1 270 " '
51 ` 89 �0,0 90 9 520061 90 27,2 270 \ 894�Z 6 -
328 -- - — -
72r " ' _02 ! 328 2 41 894 10 44 89 51 04 0
27 452 0680 .> 8 _ 10 47 42 24 1
e -- q 32311 \
2�8�5200 5
8� °2
4 200 C II I 11 27 � 0
1321V3904 3, 8943200'480 9452k� 2 245 2 6 �18945 00370
8 �520 750 ". 4 440700 80 27 0 3 23 1 �0�
00 818 2 2 _ _ 9452 0220 ° �P 894 00 9k
io 19 s/
8 45 04 '
r' ,07 80 �� CON 5.- ,pOg 8945 00 0 894 100K915�
I 07� 7 I 28 ''� -3
2661
894 0080 ' 452 894 0 0 96, 19 89 5 09 0 89 5 90
�3 � 3 3 03 ° 33nn .. 11 r
NOTE: Lakehaven Water and Sewer
District neither warrants nor guarantees
the accuracy of any facility information
provided. Facility locations and conditions
are subject to field verification.
0 330 660
Feet 10/02/2020 1
N