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City of Everett Water Supply December 2008 Everett Public Works. Everett’s Water System. Everett’s Water Source Storage. Spada Reservoir (50 billion gallons) with Culmback Dam in the forefront. Everett’s Water Source Storage. Lake Chaplain Reservoir (4.5 billion gallons).

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city of everett water supply december 2008 everett public works
City of Everett

Water Supply

December 2008

Everett Public Works

everett s water source storage
Everett’s Water Source Storage
  • Spada Reservoir (50 billion gallons) with Culmback Dam in the forefront
everett s water source storage1
Everett’s Water Source Storage
  • Lake Chaplain Reservoir (4.5 billion gallons)
sultan river water supply chronology city of everett snohomish pud
Sultan River – Water Supply ChronologyCity of Everett & Snohomish PUD
  • 1917 – 1st Water Right & Diversion Dam #1
  • 1924 – 2nd Water Right Application
  • 1929 – 3rd & 4th Water Right & Diversion Dam #2
  • 1946 – Storage Right Application #1 (113,700 Ac-Ft)
  • 1954 – 5th Water Right Application
  • 1959 – City/PUD Agreement to share water rights
  • 1960 – Build Culmback Dam – Phase I
  • 1979 – Storage Right Application #2 (153,260 Ac-Ft)
  • 1982 – Build Culmback Dam – Phase II
  • 1982 – Instream Flows Set For Project
everett s water supply and rights
Everett’s Water Supply and Rights

Supply Yield

  • Firm Yield = Avg. Annual Withdrawal Available 98% of Years
  • Firm Yield of Sultan Source = 200 MGD

With Existing Storage

Water Rights

  • Existing Water Rights on Sultan =137.5 MGD (QA); 256 MGD (QI)
  • Pending Water Right Application:

QI = 200 cfs; if QA = 100 CFS = 64.5 MGD (Est. QA)

202 MGD

climate change models general circulation models gcm
Climate Change Models General Circulation Models (GCM)

Warmest

(Pessimistic)

Warmer

Warm

(Optimistic)

three scenarios
Three Scenarios

Three operational scenarios were evaluated:

  • Unconstrained Yield (Storage: 153,000 AC-FT)
  • Yield Constrained by Transmission Upstream of Chaplain Reservoir (Storage: 153,000 AC-FT)
  • Yield Constrained by Hydropower Operations and Spada Minimum Surface Elevation of 1,380 ft (Storage: 101,000 AC-FT)
slide14

6 - 13 % reduction

Spada Lake Firm Yield

Results

24 – 37 % reduction

30 - 50 % reduction

slide16

2062

2028

Comparison of Existing Conditions and Projected Demand

20 Years on Existing Right; 50+ Years on New Right

Climate Change Impact: 6 - 13 % reduction by Yr 2100

summary of climate impact on water supply
Summary of Climate Impact on Water Supply
  • No Impact on Existing Water Right –

Good for next 20 years

  • Firm Yield would be Reduced 6 – 13% by 2100
  • Modification of SPADA Rule Curves would probably offset some of this impact (To be determined in future studies)
spada reservoir rule curves
Spada Reservoir Rule Curves

State 1

State2

Flood

Pocket

Elevation FT

State 3

State 4

December

Water Year – July 1 to July 1