Nathan Adams Heather Allen Amy Burgard Courtney Dietz Po Chi Fung Karl Rittger

1. Analysis of Water Resources Management Strategies for the Santa Ana River Watershed Region:Reuse, Recharge, Use Efficiency Nathan Adams Heather Allen Amy Burgard Courtney Dietz Po Chi Fung Karl Rittger Advisors: Dr. Arturo Keller and Dr. Robert Wilkinson DONALD BREN SCHOOL OF ENVIRONMENTAL SCIENCE AND MANAGEMENT UNIVERSITY OF CALIFORNIA, SANTA BARBARA

2. Presentation Overview • Opportunity • Significance • Background & Baseline • Results • Recommendations SARW = Santa Ana River Watershed Headwaters of the Santa Ana River

3. 3.1 2.0 1.4 Opportunity Source: CA State Water Plan, 2005

4. Goals • Use Local & Regional UWMPs to establish baseline demand & supply projections • Identify the potential for alternative water management strategies in the region. • Analyze future water resources scenarios for the region. • Identify barriers to implementation of strategies.

5. SARW Region - Overview

6. Significance Potentially increase local water reliance in the SARW Region by: Reducing Demand Increasing Local Supply AFY AFY Water Use Efficiency Water Reuse & Recharge

7. Demand Drivers Source: MWD RUWMP, 2005

8. SARW Region Demand Source: MWD RUWMP, 2005.

9. SARW Region Supply Source: EMWD, IEUA, MWDOC, WMWD and Cities of Anaheim, Fullerton, Santa Ana UWMP, 2005.

10. Alternative Future Scenarios • DemandScenarios • Baseline – MWD Projections • Pacific Institute Efficiency • Evapotranspiration (ET) Controller • California Appropriate Landscapes (CALscapes) • SupplyScenarios • Baseline – Regional UWMP Projections • 75% Maximum Reuse / Baseline Recharge • 75% Maximum Reuse / Maximum Recharge • 95% Maximum Reuse / Maximum Recharge

11. WASEMWAter Scenario Evaluation Model • Facilitates developing and assessing water demand & supply scenario options • Model used for the State Water Plan 2005 • Focus on Water Use Efficiency for the Region

12. Formation of Demand Scenarios

13. WASEM Demand Projections 27% CALscape Demand Scenario in 2025 results in: • Reduction from baseline = 525,132 AF or 27%

14. Supply Options - Groundwater Recharge • Groundwater currently comprises 36% of total water supply for the SARW Region. Source: AGWA, 2000

15. Supply Options - Reuse • Non-potable reuse • Landscape irrigation • Agricultural irrigation • Industrial cooling • Toilet flushing • Wetlands enhancement • Indirect potable reuse • Recharge groundwater aquifers • Surface water reservoir augmentation

16. Supply Scenario Results 11% Max Local Supplies Scenario in 2025 results in: • Increase over baseline = 260,000 AF or 11%

17. Approach to Reducing Imports Reduction in Demand (CALscape Demand Scenario) 525,000 AF + Increase Local Supplies (Max Local Supplies Scenario) 260,000 AF = 785,000 AF Potential Reduction in Imports

19. Pacific Institute Demand + 75% Reuse/Baseline Recharge Supply Scenario ET Controller Demand + 75% Reuse/Max Recharge Supply Scenario CALscapes Demand + Maximum Supply Scenario Baseline Demand + Baseline Supply Scenario ????? % Local Supplies % Imported Supplies 100% 100% 97% 88% 77% 80% 80% 64% 60% 60% 36% 40% 40% 2025 23% 12% 20% 20% 3% 0% 0% CALscapes Demand + Maximum Supply Scenario ET Controller Demand + 75% Reuse/Max RechargeSupply Scenario Pacific Institute Demand + 75% Reuse/Baseline RechargeSupply Scenario Baseline Scenario

20. Maximizing Local Reliance • Potential to reduce imports to 3% of total projected supply in 2025. • Reduction of ~785,000 Acre-Feet of imported water through water Reuse, Recharge, & Use Efficiency management strategies.

21. Barriers • Cost • Costs to develop & implement strategies • Land Use Planning • Planning for Purple Pipe • Capitalizing on the Opportunities • Education/Awareness

22. Benefits • Reliability • $1B in avoided costs • Enhancement of local ecosystems • Improvement in local and coastal water quality • Reduction of impacts to the Colorado River & SF Bay Delta Source: DWR State Water Plan Update 2005

23. Recommendations • Maximize cost-effective urban water use efficiency technologies & programs • Maximize the capture & recharge of stormwater • Maximize reuse opportunities • Increase regional cooperation between water agencies

24. Special thanks to… • Our Client: Stephanie Barger, Earth Resources Foundation • Dr. Arturo Keller • Dr. Bob Wilkinson • Dr. John Melack • Dr. Mike McGinnis • Dr. David Groves • Martha Davis, IEUA • Rick Whetsel & Peter Vitt, SAWPA • The Bren School Faculty and Staff

25. Thank You! QUESTIONS? COMMENTS? SantaAna@bren.ucsb.edu

26. Case Studies • Reuse • Inland Empire Utilities Agency • Marin County Water Authority • Los Angeles County Sanitation District • Recharge • Association of Groundwater Agencies (AGWA) • OCWD’s Groundwater Replenishment Project • United Water Conservation District in Santa Paula • Use Efficiency • Irvine Ranch Water District’s study on Smart Irrigation Controllers • Southern Nevada Water Agency’s Xeriscape Program • Canada Mortgage and Housing Corporation’s Dual Flush Toilet Project

27. Project Approach • Background Research • Urban Water Management Plans (UWMPs) • 2005 State Water Plan • Case Studies • Successful strategies • Barriers to implementation • Solutions to overcome barriers • Formulation of Scenarios • Presentation of Scenarios • Demand • Supply • Recommendations Baseline Information What is the “future” as planned? How will this “future” incorporate water reuse, recharge, & use efficiency strategies? Identification & Evaluation of Alternative Futures Ideas to achieve these Alternative Futures

28. How the Imported Water is Distributed Wholesaler Wholesaler Retailer Source: DWR State Water Plan Update 2005

29. Presentation of Scenarios

30. Presentation of Scenarios

31. Demand Driver: Single Family Houses Source: MWD RUWMP, 2005. Source: MWD RUWMP, 2005.

32. Supply Options - Reuse