ReTHINK Water - San Diego County Water Authority
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The document summarizes the water supply challenges facing San Diego County and the Water Authority's efforts to address them. It notes that San Diego County now imports over 80% of its water supply due to population growth outpacing local supplies. Major reservoirs have been drawn down during the recent droughts, and regulatory restrictions are limiting imports. The Water Authority is working to diversify supplies through conservation, recycled water, desalination, and transfers to make the region more drought-proof.
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ReTHINK Water - San Diego County Water Authority
- 1. think RE water Water Conservation Summit June 2, 2009 Maureen Stapleton General Manager, San Diego County Water Authority
- 2. Water Authority Background Wholesale water agency created by State Legislature in 1944 24 member agencies 6 cities 14 water utility 3 irrigation districts 1 military base Service area 920,000 acres 97% of county’s population 2
- 3. Water Authority.. The early years 1946 Last year local water supply was able to support San Diego county’s population and economy County population: 552,804 91% increase from 1940
- 5. San Diego County’s Water Sources (2008) LAKE SHASTA San Diego County imports LAKE more than 80% of its OROVILLE water supply State Water Project (Bay-Delta) Colorado River 28% 54% Local Water Supply Projects 18% 5
- 6. San Diego Region’s Water Supply Portfolio 1991 Local Surface Water 5% Metropolitan Water District 95%
- 7. Drought Headlines from 1990-91 Community Outcry: ‘No More Water Shortages!’
- 8. Three Challenges to Our Water Supply 1. Drought Last three years in California 8 of last 10 on the Colorado River 2. Low Storage Major reservoirs have been drawn down to low levels 3. Regulatory Pumping restrictions are sharply limiting imported water from Northern California 8
- 9. State Water Project: Lake Oroville June 2005 – 98% of capacity 9
- 10. Lake Oroville November 2008 1.0 MAF - 29% capacity
- 11. Colorado River Hydrologic Conditions 2007 was 8th year of historic drought 2003: surplus water no longer available CRA half-full 2008 above average 117% of normal snow pack Reservoirs are at ~50% 60 MAF capacity Will take many years to refill
- 12. Fish Protections Restrict Pumping Delta smelt Central Valley steelhead Longfin smelt Banks Pumping Plant State Water Project Chinook salmon Green sturgeon Additional pumping restrictions expected 12
- 13. Pumping Flexibility Reduced Window restricted even during wet years JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ns io Re No ic t s tr 13
- 14. Delta Smelt Water Supply Impacts Reductions in water supplies from the State Water Project due to Delta 43% lost smelt pumping restrictions 44% lost 40% lost 24% lost Drier Wetter 14
- 15. Impacts to San Diego County Metropolitan Water District (MWD) voted April 14 to allocate supplies 13% reduction from MWD Water Authority voted April 23 to allocate supplies to its 24 member retail agencies Because of diversification, regional M&I shortfall is 8% Cutbacks to agriculture: 13% to 30% Moved from “Drought Watch” to “Drought Alert” April 23 Mandatory water use restrictions 15
- 16. Diversifying San Diego County’s Water Supply Portfolio 1991 Local Supplies: 5% Recycled Water Seawater 6% Desalination Local Surface MWD: 95% 10% Conservation Water 11% 7% Groundwater Groundwater Local & QSA 6% MWD Supplies 29% 29% Canal Lining MWD Transfer 71% 9% IID Transfer 2008 22% 2020 16
- 17. How do we use water? Fiscal Year 2008: 691,931 acre-feet 17% - Commercial/Industrial 13% - Public Sector 12% - Agricultural 59% - Residential
- 18. Reducing Per Capita Consumption es Re ti v gu en la t Inc ory s/ am Ra Education/ gr te o Outreach s Pr
- 19. Addressing the Region’s Water Challenges – Tools in the Toolbox Water Demand Voluntary and Mandatory Conservation Pricing and Tiered Rate Structures Development and Regulations & Standards Building Landscaping Production, i.e. manufacturing, energy creation Use restrictions
- 20. Additional Approach: Changing Social Norms Conservation often means deviating from normal activity Promote community support - Changing Perceptions & Expectations Your neighbors are conserving - Peer/Societal pressure if not conserving Momentum from resistance to acceptance to a “way of life”
- 26. Strategic Partnerships & Pilot Programs SDCWA Member Agencies
- 27. Other Partners
- 28. think RE water