2010 URBAN WATER MANAGEMENT PLAN December 15, 2010 Zone 7 Water Agency Livermore, CA 2010 URBAN WATER MANAGEMENT PLAN Prepared by: Zone 7 Water Agency 100 North Canyons Parkway Livermore, CA 94551 (925) 454-5000 Version: December 15, 2010 ZONE 7 WATER AGENCY Report Contributors: Kurt Arends, P.E. – Assistant General Manager of Engineering Boni Brewer – Public Information Officer Jarnail Chahal, P.E. – Principal Engineer Jill Duerig, P.E. – General Manager Amparo Flores, P.E. – Associate Engineer JaVia Green – Staff Analyst Matt Katen, P.G. – Principal Engineer Brad Ledesma, P.E. – Associate Engineer Robyn Navarra – Water Conservation Coordinator Sal Segura, P.E. – Associate Engineer Vince Wong, P.E. - Assistant General Manager of Operations Report Contact: Amparo Flores, (925) 454-5019, [email protected] or Brad Ledesma, (925) 454-5038, [email protected] TABLE OF CONTENTS 1. Introduction ........................................................................................................................ 1-1 1.1 Previous Urban Water Management Plans ........................................................................ 1-1 1.2 The Purpose of the 2010 UWMP ....................................................................................... 1-1 1.3 Plan Contents and Organization......................................................................................... 1-2 1.4 Changes from the 2005 UWMP ......................................................................................... 1-2 2. General Service Area ......................................................................................................... 2-1 2.1 Background ........................................................................................................................ 2-1 2.2 Service Area ....................................................................................................................... 2-3 2.3 Existing Water Use Sectors ............................................................................................... 2-6 2.4 Population Growth ............................................................................................................. 2-6 2.5 Climate ............................................................................................................................... 2-9 2.6 Zone 7’s Conveyance, Treatment, and Transmission System ......................................... 2-11 3. Agency Coordination ......................................................................................................... 3-1 3.1 Coordination with Other Agencies .................................................................................... 3-1 3.2 Resource Maximization and Import Minimization ............................................................ 3-3 4. Public Participation ........................................................................................................... 4-1 4.1 Public Participation ............................................................................................................ 4-1 5. Water Supply Sources and Storage Options ................................................................... 5-1 5.1 Imported Surface Water Supply ......................................................................................... 5-1 5.2 Local Surface Water Runoff .............................................................................................. 5-3 5.3 Local Storage ..................................................................................................................... 5-4 5.4 Non-Local Storage ............................................................................................................. 5-5 5.5 Total Supply and Storage ................................................................................................... 5-6 6. Groundwater ...................................................................................................................... 6-1 6.1 The Livermore Valley Groundwater Basin ........................................................................ 6-1 6.2 Groundwater Quantity ....................................................................................................... 6-2 6.3 Groundwater Quality ......................................................................................................... 6-8 7. Reliability of Supplies ........................................................................................................ 7-1 7.1 Zone 7’s Existing Water Supply Reliability Policy ........................................................... 7-1 7.2 Basis of Water Year Data .................................................................................................. 7-1 7.3 Reliability of Local Runoff from Arroyo del Valle ........................................................... 7-2 7.4 Reliability of Supply from the State Water Project ........................................................... 7-4 7.5 Reliability of BBID Contract ............................................................................................. 7-8 7.6 Additional Reliability Provided with Storage .................................................................. 7-10 7.7 Total Supply Reliability ................................................................................................... 7-13 8. Water Transfers – Supplies and Storage ......................................................................... 8-1 8.1 Adiitional Supplies Through Water Transfers ................................................................... 8-1 8.2 Water Storage Outside Zone 7 ........................................................................................... 8-2 8.3 Total Water Transfer and Storage Agreements ................................................................. 8-2 9. Past, Present, and Projected Water Demands ................................................................. 9-1 9.1 Past Water Demands Served by Zone 7 ............................................................................. 9-1 9.2 Breakdown of Water Accounts and Use by Sector in 2009 ............................................... 9-5 9.3 Projected Water Demands .................................................................................................. 9-6 10. Water Demand Management Measures ........................................................................ 10-1 10.1 Implementation of Demand Management Measures ..................................................... 10-2 11. Planned Water Supply Programs and Projects ............................................................ 11-1 11.1 Long-term “Delta Fix” ................................................................................................... 11-1 11.2 Water System Master Plan Update ................................................................................ 11-2 11.3 Key Water Supply Facility Improvements .................................................................... 11-3 11.4 New Supply Assumptions for the UWMP ..................................................................... 11-5 12. Development of Desalinated Water ................................................................................ 12-1 12.1 Overview ........................................................................................................................ 12-1 12.2 Completed Work ............................................................................................................ 12-2 12.3 Ongoing Efforts ............................................................................................................. 12-2 13. Water Shortage Contingency Plan ................................................................................. 13-1 13.1 Stages of Action ............................................................................................................. 13-2 13.2 Three-Year Minimum Water Supply ............................................................................. 13-3 13.3 Catastrophic Water Supply Interruption ........................................................................ 13-4 13.4 Prohibitions and Ordinances .......................................................................................... 13-5 13.5 Impacts of Drought Actions on Revenues and Expenditures ........................................ 13-5 13.6 Reduction Measuring Mechanisms ................................................................................ 13-6 14. Recycled Water Plan ........................................................................................................ 14-1 14.1 Coordination .................................................................................................................. 14-1 14.2 Wastewater Quantity, Quality and Current Uses ........................................................... 14-2 14.3 Potential and Projected Use, Optimization Plan with Incentives .................................. 14-3 15. Water Quality Impacts on Reliability ............................................................................ 15-1 15.1 Imported Surface Water Supply ..................................................................................... 15-1 15.2 Local Surface Water Runoff .......................................................................................... 15-2 15.3 Local Storage ................................................................................................................