HomeMy WebLinkAboutCOW 2023-04-24 Item 4C - Powerpoint Shown at Meeting - Water System Storage Needsatom
A brief history and a future outlook of Tukwila's water system storage facilities
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Figure ES.1
Water System Map
Comprehensive Water Plan
City of Tukwila
vr.,.
Skyway Water and
Sewer District
14001,10 Pump
Swan. 0.0.1 0N,
And NW
063410011
Pump Stat on.
Ei Supply StaOon
S& only Stat:c11
H PR0
rrw
snare
Roads
_ Gty Lans
Relrl waver Srrvrcr Area
Tukwila Pressure Zonas
Prer,ure Zere 320
Plexaum Zcm,r 570
Pmasure. Zcnc 300
Plensurr Zone 300
Pressutt Zone 400
Pleasure Zone 465
Future Tukw,:a
Adjacent Purveyors
Cty of Kent
Coy o4 Renton
City of Scarce
11ghl.ne Water D::Sid
KCOYD 20
KCIVD 020
Savoy Water and
Sewer D,lnct
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0 1100 3.000
Pressure Zones
➢ 320 pressure zone-, Northern portion of East Marginal Way (Mainly serves Boeing properties)
➢ 340 pressure zone- Lower Ryan Hill/MLK Jr. Way (Fed by 465 pressure zone)
➢ 360 pressure zone- CBD, Valley floor (Largest zone by area and connections)
➢ 380 pressure zone- Crystal Springs (Smallest zone, isolated from main distribution system)
➢ 400 pressure zone- North Hill (Most residential connections, fed by North Hill Reservoir, can
be fed by 360 zone)
➢ 465 pressure zone- Upper Ryan Hill (Isolated from main distribution system)
- Cascade Water Alliance/SPU
4.4 ,
Tukwila Water
Department is a member
of Cascade Water .Alliance.
Cascade is a group of eight
water municipalities
formed to provide water
supply for the current and
future demands of the
members.
Tukwila receives 100%
of their water through
supply stations
connected to Seattle
Public Utilities.
North Hill Reservoir & Pump Station
Built in 1991 to provide storage, increase pressure, and improve fire flow
- Built in phases
I. Property was identified and purchased
II. Construction of transmission main from Southcenter Blvd up the trail(Old Denny's, Macau
casino) to 57th Ave S.
III. Construction of Transmission main along Tukwila Parkway from Andover Park East to
Bahama Breeze curve(old movie theatre) and then bored under neath 1-405 to
Southcenter Blvd.
IV. Tank/pump station was under construction concurrent to the construction of the
transmission mains.
North Hill Reservoir/Pump Station Specs
Table 4.4 North Hill Reservoir
Description
Value
Cpacty
Type
Year Constructed
Diameter
Height
Base Elevation
Overflow Devotion
Ground Elevation
Influent/Effluent Control Valves
IG
Concrete
1991
115 feet
23 feet
226 feet
249 feet
225 feet
Influent 6 -inch CfaVaI valve
Tab
Y ar
Table 4.5 North Hill Pump Station
North HIll Number HP Rated Total
Pump Station Capacity Capacity,
each, gpm gpm
Supply To
High Pumps 2 30 480 960
Low Pumps 2 50 1.050 2,150
Fire Flow
250 4,000 4,000
Pumps
400 Zone
360 Zone
Fire flows to 4001360
ones
Water Plan Storage Requirements
e 6.5 Required Storag
Equalizin
Storag A
Standby
Storage.
G
Fire
Suppr ssion
Storag
MG
Total
R.tquir d
Stara
Total
Existin
Storage,
Storag
Surptusl
(D licit)
360 Servic& Levet
2010
2016
2030
0.20
0.30
0.40
1.30
178
2.90
0.96
0.96
0.95
1.50
2.04
3.30
2,00
2.00
2.00
0.50
(0.04)
.30)
2021 Water Plan Storage Deficits
360 Service Level Storage Requirements
,btOrag.0iPOmPo,'. •M•
Operational(1)
Equalizing
SS/FSS (nested)
Total Required Storage
Total Existing Storage
Storage Surplus / (Deficit)
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0.21 0.25 0.30
2.63 3.12 3.84
3.04 3.57 4.34
2.00 2.00 2.00
(1.04) (1.57) (2.34)
465 Service Level Storage Requirements
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Operational(1)
Equalizing
SS/FSS (nested)
Total Required Storage
Total Existing Storage
Storage Surplus / (Deficit)
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0.02 0.02 0.02
0.01 0.01 0.01
0.18 0.18 0.18
0.21 0.22 0.22
0.00 0.00 0.00
(0.22) (0.22) (0.22)
360/465 Combined Service Level Storage
Requirements
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Operational('
Equalizing
SS/ESS (nested)
Total Required Storage
Total Existing Storage
Storage Surplus / (Deficit)
VIII
"110 1 yl
0.20
0.22
2.70
3.12
2.00
(1.12)
0.20
0.26
3.21
3.67
2.00
(1.67)
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0.20
0.31
3.94
4.45
2.00
(2.45)
Mercer Island Water Valve Failure
Mercer Island water supply lines down; city urges residents to
conserve water
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