california aqueduct subsidence february 10, 2020...explanation los gatos bowl 1.8 feet or subsidence...
TRANSCRIPT
C A L I F O R N I A D E P A R T M E N T O F W A T E R R E S O U R C E S
California Aqueduct Subsidence
February 10, 2020
• Supplies water to 27 million people and 750,000 acres of farmland
• Up to 3 feet of subsidence during recent drought
• Subsidence projected to continue if no action is taken
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California Aqueduct
Extent of Subsidence
Recent DWR Studies
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•Subsidence due to deep groundwater pumping
•Over 2 feet of subsidence from recent drought can not be recovered
•Transition from annual to perennial crops
•Aqueduct capacity reduced by 20% in some locations
•Reduced Aqueduct operational flexibility
Impacts on the Aqueduct
• Decreased delivery capacity
• Increased cost to deliver water
• Decreased system reliability
• Increased operations and maintenance
Impacts – Damaged Liner
Impacts – Subsided Gate
• Restore delivery capacity for reliable water delivery
• Restore operational flexibility
• Long-term infrastructure resiliency
• Affordability
• Pursue supplemental funding
Key Considerations
Sustainable Groundwater Management Act
• Engage with sustainable groundwater agencies and others
• Protect the Aqueduct from further damage
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What’s Next?Near-term Efforts
• Raise portions of the Aqueduct
• Repair siphons and gate structures
• Raise bridges over Aqueduct
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Long-term Efforts
• Conduct feasibility study
• Plan, design, and implement enduring repairs to the Aqueduct
Questions?