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CALIFORNIA DEPARTMENT OF WATER RESOURCES California Aqueduct Subsidence February 10, 2020
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California Aqueduct Subsidence February 10, 2020...Explanation Los Gatos Bowl 1.8 feet or subsidence -8.9. -7.9. -5.9- -3.9- -0.9- Kern Bowl -4 -3 .2 o 14 Of subsidence Lost Kern Hilts

Jul 06, 2020

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Page 1: California Aqueduct Subsidence February 10, 2020...Explanation Los Gatos Bowl 1.8 feet or subsidence -8.9. -7.9. -5.9- -3.9- -0.9- Kern Bowl -4 -3 .2 o 14 Of subsidence Lost Kern Hilts

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

Page 2: California Aqueduct Subsidence February 10, 2020...Explanation Los Gatos Bowl 1.8 feet or subsidence -8.9. -7.9. -5.9- -3.9- -0.9- Kern Bowl -4 -3 .2 o 14 Of subsidence Lost Kern Hilts

• 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

Page 3: California Aqueduct Subsidence February 10, 2020...Explanation Los Gatos Bowl 1.8 feet or subsidence -8.9. -7.9. -5.9- -3.9- -0.9- Kern Bowl -4 -3 .2 o 14 Of subsidence Lost Kern Hilts

Extent of Subsidence

Page 4: California Aqueduct Subsidence February 10, 2020...Explanation Los Gatos Bowl 1.8 feet or subsidence -8.9. -7.9. -5.9- -3.9- -0.9- Kern Bowl -4 -3 .2 o 14 Of subsidence Lost Kern Hilts

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

Page 5: California Aqueduct Subsidence February 10, 2020...Explanation Los Gatos Bowl 1.8 feet or subsidence -8.9. -7.9. -5.9- -3.9- -0.9- Kern Bowl -4 -3 .2 o 14 Of subsidence Lost Kern Hilts

Impacts on the Aqueduct

• Decreased delivery capacity

• Increased cost to deliver water

• Decreased system reliability

• Increased operations and maintenance

Page 6: California Aqueduct Subsidence February 10, 2020...Explanation Los Gatos Bowl 1.8 feet or subsidence -8.9. -7.9. -5.9- -3.9- -0.9- Kern Bowl -4 -3 .2 o 14 Of subsidence Lost Kern Hilts

Impacts – Damaged Liner

Page 7: California Aqueduct Subsidence February 10, 2020...Explanation Los Gatos Bowl 1.8 feet or subsidence -8.9. -7.9. -5.9- -3.9- -0.9- Kern Bowl -4 -3 .2 o 14 Of subsidence Lost Kern Hilts

Impacts – Subsided Gate

Page 8: California Aqueduct Subsidence February 10, 2020...Explanation Los Gatos Bowl 1.8 feet or subsidence -8.9. -7.9. -5.9- -3.9- -0.9- Kern Bowl -4 -3 .2 o 14 Of subsidence Lost Kern Hilts

• Restore delivery capacity for reliable water delivery

• Restore operational flexibility

• Long-term infrastructure resiliency

• Affordability

• Pursue supplemental funding

Key Considerations

Page 9: California Aqueduct Subsidence February 10, 2020...Explanation Los Gatos Bowl 1.8 feet or subsidence -8.9. -7.9. -5.9- -3.9- -0.9- Kern Bowl -4 -3 .2 o 14 Of subsidence Lost Kern Hilts

Sustainable Groundwater Management Act

• Engage with sustainable groundwater agencies and others

• Protect the Aqueduct from further damage

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Page 10: California Aqueduct Subsidence February 10, 2020...Explanation Los Gatos Bowl 1.8 feet or subsidence -8.9. -7.9. -5.9- -3.9- -0.9- Kern Bowl -4 -3 .2 o 14 Of subsidence Lost Kern Hilts

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

Page 11: California Aqueduct Subsidence February 10, 2020...Explanation Los Gatos Bowl 1.8 feet or subsidence -8.9. -7.9. -5.9- -3.9- -0.9- Kern Bowl -4 -3 .2 o 14 Of subsidence Lost Kern Hilts

Questions?