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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 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

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  1. City of Everett Water Supply December 2008 Everett Public Works

  2. Everett’s Water System

  3. Everett’s Water Source Storage • Spada Reservoir (50 billion gallons) with Culmback Dam in the forefront

  4. Everett’s Water Source Storage • Lake Chaplain Reservoir (4.5 billion gallons)

  5. Everett’s Source at Spada

  6. 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

  7. 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

  8. Climate Change Models General Circulation Models (GCM) Warmest (Pessimistic) Warmer Warm (Optimistic)

  9. Impact on Temperature

  10. Impact on Sultan Streamflow

  11. 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)

  12. Impact of Climate Change on Three Scenarios

  13. 6 - 13 % reduction Spada Lake Firm Yield Results 24 – 37 % reduction 30 - 50 % reduction

  14. 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

  15. 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)

  16. Spada Reservoir Rule Curves State 1 State2 Flood Pocket Elevation FT State 3 State 4 December Water Year – July 1 to July 1

  17. Questions?

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