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
2 California Aqueduct • 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
Extent of Subsidence
Recent DWR Studies •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 4
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
Key Considerations • Restore delivery capacity for reliable water delivery • Restore operational flexibility • Long-term infrastructure resiliency • Affordability • Pursue supplemental funding
9 Sustainable Groundwater Management Act • Engage with sustainable groundwater agencies and others • Protect the Aqueduct from further damage
10 What’s Next? Near-term Efforts Long-term Efforts • Raise portions of the Aqueduct • Conduct feasibility study • Repair siphons and gate • Plan, design, and implement structures enduring repairs to the Aqueduct • Raise bridges over Aqueduct
Questions?
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