Developing a Water Portfolio World Water Week August 2008 · 2015-08-14 · Wholesale water agency...
Transcript of Developing a Water Portfolio World Water Week August 2008 · 2015-08-14 · Wholesale water agency...
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Developing a Water PortfolioDeveloping a Water PortfolioWorld Water WeekWorld Water Week
August 2008August 2008
Maureen A. StapletonSan Diego County Water Authority
USA
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Precipitation in the SouthwestYou Are Here
Water Supply Challenge
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Wholesale water agency created by California State Legislature in 1944
24 member (retail) agencies35-member board of directorsServes 3+ million people and supports region’s $155 billion economy
Pipelines & FacilitiesNearly 485 km (1 – 3 meters in diameter) of treated and untreated water380 km3 per day membrane treatment plant31,000 km3 reservoirPending 110 meter dam raise –additional 185,000 km3 storage
RainfallAverage – 330mm2007 & 2008 – 80mm per year
San Diego County Water AuthoritySDCWA SERVICE AREA
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Sources of Imported Water Supplies
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San Diego County’s Water Supply Portfolio
1991
Imported Water- 95%
Local Surface Water - 5%
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Drought Headlines from 1990-91
Community Outcry: ‘No More Water Shortages!’
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Comprehensive Action Plan
• Diversify Region’s Water Supply Portfolio– Aggressive Conservation
Programs– Development of Local
Supplies• Reclamation• Brackish groundwater recovery• Desalination
– Secure additional imported supplies from new sources
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Colorado River Quantification Settlement Agreement
• Largest & longest agricultural to urban water transfer in the United States
• Executed October 2003• Major diversification of San
Diego supply: 342,000 km3 per year by 2018• On-farm & in-system conservation
in agricultural district • 246,000 km3 per year for 45 -75
years• Replacement of earthen-lined with
concrete-lined canals• 96,000 km3 per year for 110 years
Coachella Canal Project
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Improving Reliability through Diversification
2007
Traditional Imported Water Supplies 76%
Agricultural Water Transfer
6%
Local Surface Water 6%
Groundwater 2% Conservation
7%
Recycled Water 2%Canal Projects
1%
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Long-Term Development of San Diego County’s Water Supply Portfolio
2007 2020
Conservation 11%
Canal Projects 9%
Local Surface Water
7%Groundwater
6%
Recycled Water 6%
Agricultural Transfer 22%
Groundwater Local & Transfer Supplies 24% Traditional
Imported 29%
Seawater Desalination
10%
Traditional Imported 76%
1991Local Supplies: 5%
Imported: 95%
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The Hydrologic Past and the Uncertain Future
• Significant changes in Colorado River hydrology– 2000 – negotiated surplus
criteria policies. – 2007 was 8th year of historic
drought with current reservoirs at <50% capacity
• Challenges in the California Bay Delta:• 1998 – historic snowpack and
extensive flooding• 2008 - 2nd driest March on
record with 55% runoff and reservoirs at 40% of capacity
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Delta Smelt The “Super Fish”
• Small in size, big in impact• Able to reduce water flowing to
25 million people• State and federal courts found
Delta pumping jeopardized Delta smelt & longfin smelt
• 2007 – Largest court-ordered pumping & delivery restrictions in history. Loss of 984,000 km3
• Governor declares statewide water emergency in June 2008
[<---------- 5 cm---------- ]
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The New Reality – Colorado River Reservoirs
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State Water Project Reservoir– February 2005
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State Water Project Reservoir – June 2008
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Keys to Future Water Resources Planning
• Accept that the improbable happens• Agencies must plan for a range of possibilities,
including extreme events• Adaptive planning is essential in this era of
uncertainties – flexibility is key• Partnerships are essential to developing
sustainable solutions • Focus on expanding the size of the entire pie,
not just your piece of the pie• No single/simple answer to solve complex
problems. Need multiple tools
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World Water WeekWorld Water WeekAugust 2008August 2008
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