Castaic Lake Water Agency

1. Castaic Lake Water Agency Water Planning Update Southern California Association of Governments June 9, 2005 Reiter/Lowry/Consultants

2. Introduction • CLWA developed a land use based water demand program in 1987 • CLWA relies on the County Assessor’s office for parcel data information • APN numbers • Acreage • Development status • Land use • Other Reiter/Lowry/Consultants

3. Water Demand Model • The Agency developed water demand factors by land use category • Each purveyor has their own water demand characteristics • Model is periodically calibrated by taking the purveyors water sales by parcel and matching that to what was projected Reiter/Lowry/Consultants

4. Projected Water Demand • This model provides the total water demand based on current authorized land use • The timing of demand is done with the assistance of the purveyors • Their data is integrated into the model to project approximate time when the demand will materialize Reiter/Lowry/Consultants

5. Projected Water Demand • Projections are intended to aid future demand planning • It does not forecast droughts or when accelerated growth will occur Reiter/Lowry/Consultants

6. California Water Planning History • In 1957 the department of water resources prepared the “California Water Plan” • The plan became the State Water Project • CLWA signed contract in 1963 • CLWA began receiving water in 1980 Reiter/Lowry/Consultants

7. California’s Annual Water Supply Does Not Include Colorado River DWR Bulletin No. 3 May 1957 Reiter/Lowry/Consultants

8. State Water Project Deliveries Reiter/Lowry/Consultants

9. Reiter/Lowry/Consultants

10. 1957 Projection of Ultimate Use of Water Source: DWR Bulletin No. 3 1957 Reiter/Lowry/Consultants

11. Current Use of Water Source: DWR Bulletin 160-98 Reiter/Lowry/Consultants

12. Projected v. Actual Reiter/Lowry/Consultants

13. Result • Same amount of water into the system • BUT different uses have developed through time Reiter/Lowry/Consultants

14. Agency Policy • Develop facilities and water supply five years ahead of need • Agency water supply is based on the state water project and local groundwater provided by purveyors • There is no overdraft as the basin is and has historically been operated in a cooperative manner to ensure there is no overdraft Reiter/Lowry/Consultants

15. Agency Serves Four Purveyors • CLWA Santa Clarita Water Division • LA County Water Works District 36 • Newhall County Water District • Valencia Water Company (IOU) Reiter/Lowry/Consultants

16. CLWA Water Supply • SWP contractual Table A amount is • 95,200 AF • Entire amount not available in every year Reiter/Lowry/Consultants

17. CLWA Water Supply • Groundwater • Alluvial aquifer 20,000 to 45,000 AF • Saugus formation 10,000 to 20,000 AF • Some well capacity has been impacted by perchlorate contamination • This can be treated and thus is a water quality and cost issue, not A quantity issue • Treatment is planned to come on-line in 2006 Reiter/Lowry/Consultants

18. Current Demand • Current total demand in the Santa Clarita Valley including agriculture: • 89,000 af Reiter/Lowry/Consultants

19. Impact of SB 610 and 221 • Assurance of water supply has been moved to the beginning of the land use planning process • This is not a problem since water suppliers have been planning ahead of need as a matter of course Reiter/Lowry/Consultants

20. Agency Water Supply and Inventory System • In response to the new laws a water demand and inventory plan has been developed • The agency proposes to build on its current database but would like the land planning agencies to provide proposed land use changes as soon as application is made Reiter/Lowry/Consultants

21. Agency Water Supply and Inventory System • This information will be input to the agency database to demonstrate what land use changes are projected in the near future and their potential impact on the water demand • This data would then be matched to water supply planning Reiter/Lowry/Consultants

22. Agency Water Supply and Inventory System • Information regarding the current supply • Demand status will be provided quarterly to the land use planning agencies Reiter/Lowry/Consultants

23. Urban Water Management Plan Update • Agency is currently working on the draft 2005 UWMP • Public participation effort is ongoing • The 2005 update will be in compliance with new requirements as enacted by the legislature since 2000 Reiter/Lowry/Consultants

24. Summary • Groundwater not in overdraft • Agency and the purveyors have developed an extensive groundwater model • Agency has developed a water banking program to improve SWP reliability • Groundwater quality good except for small portion of well capacity affected by Perchlorate Reiter/Lowry/Consultants

25. Summary • Perchlorate will be removed by pump and treatment technology coming on-line in 2006 • Additional water purchases will be made as needed to comply with five year lead time • Letters to county and city land use planning agencies will be sent as follow-up to conversations regarding the cooperative efforts of land planning and water planning agencies Reiter/Lowry/Consultants