San Diego’s Water Supply Diversification Accomplishments and Next Steps

1. San Diego’s Water Supply Diversification Accomplishments and Next Steps Halla RazakColorado River Program Director August 15, 2013

2. San Diego County Water Authority • Wholesale water agency created by Legislature in 1944 • 24 member water agencies • 36-member board of directors • Service area • 950,000 acres (3,845 km2) • Serves 3.1 million people, $186 billion economy • Builds, owns, and maintains large-scale water infrastructure

3. San Diego’s Water: The Early Years • 1946 – The last year local water supply was able to support San Diego county’s population and economy • 1946 County Population: • 552,804 • 91% increase from 1940

4. LAKE SHASTA LAKE OROVILLE Meeting Demand: Importing Water • SDCWA became a member agency of MWD in December 1946 • MWD supplied water to San Diego from the Colorado River, and later through the State Water Project State Water Project (Bay-Delta) ColoradoRiver Local Supplies and Conservation

5. Historical Reliance on One Supplier 1991 Supply Portfolio 5% 95% Total = 578 TAF Metropolitan Water District Local Surface Water

6. Drought Hit in 1987-92:San Diego’s Water Supply Cut Community’s Response: “Never Again!” “No More Water Shortages!”

7. Response to Single Source Strategy • Employ resource strategies unique to San Diego area • No single resource strategy can manage all uncertainties • Multi-faceted approach required • Supply diversification • New supplies • Conservation • Infrastructure improvements

8. Water Reliability through Diversification • Diversify supply sources • Imported Supply Development • Imperial Irrigation District transfer • Canal lining projects • Local Supply Development • Conservation • Recycling, Recovery, & Reuse • Seawater Desalination All American Canal Lining Project 23 miles of concrete-lined canal Completed in 2010

9. Water Reliability through Diversification • Invest in regional water delivery, storage, and treatment • $3.6 billion Capital Improvement Program • Ensure a reliable treatment & delivery system • $2 billion of investments in past decade alone • Protect the region from imported supply cut-off (e.g. earthquake, drought) • $1.5 billion Emergency Storage Project Pipeline Relining Program

10. Diversify Imported Supply: IID Transfer and Canal Lining Projects IID and Canal Lining Deliveries 2003-2021

11. Diversify Imported Supply:Salton Sea Mitigation • QSA water transfers reduce agricultural drainage flows to the Salton Sea – Requires Mitigation and Restoration • Formed QSA Joint Powers Authority to manage and implement mitigation projects QSA JPA Financial Obligations The state is responsible for all other costs.

12. Diversify Imported Supply:Salton Sea Mitigation Water • From 2003-2012, QSA JPA has spent $26.7M on a total of 250 TAF mitigation water • Remaining transfers will cost an additional $70M for 550 TAF through 2017

13. Diversify Imported Supply:Salton Sea Air Quality Mitigation Air Quality Stations

14. Local Supply Development:Water Conservation • Multi-decade programs • Incentive programs • Surveys and retrofits • Efficiency standards • Toilets and showerheads • Landscapes • 2020: 13% of demand met through local conservation

15. Local Supply Development:Recovery, Reuse, and Recycling • Recycling and Recovery Projects since 1991 • >10 MGD brackish groundwater recovery and desalination • 17 active non-potable recycling projects • 65% increase in recycled water • and groundwater supplies by 2020 • Indirect Potable Reuse • Desalination • Carlsbad, Camp Pendleton, Mexico • Local supplies to provide ~25% of the region’s water supply by 2020

16. Local Supply Development:Carlsbad Desalination Facility

17. TOVWTP Improvements Pipeline 3 Relining (27,100 feet) Desalination Plant Current trench work Complete Current tunnel work Preparing for tunnel work Desal Conveyance Pipeline 10-miles of new 54-inch pipe Aqueduct Connection Facilities Current trench work 17

18. Local Supply Development:Carlsbad Desalination Facility

19. Local Supply Development:Carlsbad Desalination Facility

20. Investing in Local Storage:San Vicente Dam Raise Project will increase local storage by 152,000 AF: 100,000 AF – Storage for Dry Years 52,000 AF – Emergency Storage

21. Supply Diversification through 2020 1991 2012 2020 26 TAF (5%) 24 TAF (4%) 103 TAF (13%) 70 TAF (11%) 44 TAF (6%) 80 TAF (10%) 80 TAF (13%) 18 TAF (3%) 552 TAF (95%) 56 TAF (7%) 190 TAF (24%) 61 TAF (10%) 85 TAF (14%) 27 TAF (4%) Total = 578 TAF 231 TAF (30%) 274 TAF (45%) 48 TAF (6%) Total = 779 TAF Total = 612 TAF Metropolitan Water District Recycled Water Imperial Irrigation District Transfer Seawater Desalination Groundwater All American & Coachella Canal Lining Local Surface Water Conservation TAF=Thousand Acre-Feet

22. Potential for imported supply shortages Recurring droughts Regulatory restrictions on SWP deliveries Delta levee failure due to earthquake Limited storage reserves on the SWP Future water demand increases Potential effects of climate change Next Steps: Challenges to Ensuring Supply Reliability for San Diego Drought SWP Reliability

23. Bay Delta Conservation Plan Process The Colorado River Basin Supply and Demand Study Examines scenarios for future imbalances between supply and demand Incorporates climate change models Next Steps: Assessment of Future Resource Availability

24. The Colorado River Basin Supply and Demand Study Provides options to address predicted imbalances such as: Early development of M&I and Ag. Conservation Importing water from other river basins, local supplies, water reuse, weather modification and tamarisk control Incorporates climate change models SDCWA is actively participating in the Study Currently involved in the Agricultural Conservation & Transfers, and Municipal & Industrial Conservation and Reuse Workgroups Next Steps: Assessment of Future Resource Availability

25. Questions Visit our website: SDCWA.org Stay in touch with the Water Authority sdcwa.org/mobile-news-app @sdcwa