Water Authority Board Chair Michael T. Hogan

September 13, 20111

Toby Roy◦ Overview of local supply mix

Cathy Pieroni◦ San Diego’s water purification efforts

Bob Yamada◦ Regional seawater desalination

Q & A after each presentation

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LAKESHASTA

LAKEOROVILLE

State Water Project(Bay-Delta)

20%Colorado River

50%

Local Supplies and Conservation

30%

San Diego County imports ~70% of its water supply

*Estimated3

Regulatory

restrictions

4

Delta Smelt

Longfin Smelt

Chinook Salmon

Central Valley Steelhead

Green Sturgeon

Regulatory

restrictions

Drought/climate

change

5

Lake Mead on Colorado River showing “bathtub ring” signifying low water levels.

Regulatory

restrictions

Drought/climate

change

Increasing

demand/limited

supply

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Downtown Phoenix

Regulatory

restrictions

Drought/climate

change

Increasing

demand/limited

supply

Rising costs7

2004 Bay-Delta levee break

2011(estimated)1991

552 TAF (95%)

26 TAF (5%)

Total = 578 TAF

20 TAF(3%)

285 TAF (47%)

80 TAF (13%)

72 TAF (12%)

75 TAF (12%)

28 TAF (5%)

51 TAF(8%)

Total = 611 TAF

Metropolitan Water District

Imperial Irrigation District Transfer

All American & Coachella Canal Lining

Seawater Desalination

Local Surface Water

Recycled Water

Groundwater

Conservation (existing and additional)

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TAF = Thousand acre-feet

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San Diego County Average: 10-15 inches per year

Arid Climate of the Southwest

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Areas of Abundant Groundwater Resources

San Diego Area Groundwater

Resources Are Small

Southern California Groundwater Basins

231 TAF (30%)

80 TAF (10%)

27 TAF (4%)

48 TAF (6%)

56 TAF (7%)

44 TAF (6%)

103 TAF (13%)

190 TAF (24%)

Total = 779 TAF (thousand acre-feet)

Metropolitan Water District

Imperial Irrigation District Transfer

All American & Coachella Canal Lining

Seawater Desalination

Local Surface Water

Recycled Water

Groundwater

Conservation (existing and additional)

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Visit our website: sdcwa.org

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