California Aqueduct Subsidence February 10, 2020 2 California - - PowerPoint PPT Presentation

california aqueduct subsidence february 10 2020
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California Aqueduct Subsidence February 10, 2020 2 California - - PowerPoint PPT Presentation

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


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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

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  • 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

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SLIDE 3

Extent of Subsidence

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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
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SLIDE 5

Impacts on the Aqueduct

  • Decreased delivery capacity
  • Increased cost to deliver water
  • Decreased system reliability
  • Increased operations and

maintenance

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Impacts – Damaged Liner

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Impacts – Subsided Gate

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  • Restore delivery capacity for reliable

water delivery

  • Restore operational flexibility
  • Long-term infrastructure resiliency
  • Affordability
  • Pursue supplemental funding

Key Considerations

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SLIDE 9

Sustainable Groundwater Management Act

  • Engage with sustainable

groundwater agencies and

  • thers
  • Protect the Aqueduct from

further damage

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SLIDE 10

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

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SLIDE 11

Questions?