Zone 7 Water Agency 100 North Canyons Parkway, Livermore, CA 94551 (925) 454-5000 2015 Urban Water Management Plan March 31, 2016 Errata Sheet for Minor Corrections to Zone 7 Water Agency 2015 Urban Water Management Plan (UWMP) This errata sheet logs minor content errors that were identified after final adoption of the Zone 7 Water Agency 2015 UWMP. DWR has determined that these corrections are minor and do not require the UWMP to be amended. X These data errors have been corrected in the Department of Water Resources (DWR) UWMP database at https://wuedata.water.ca.gov/secure/ X This errata sheet has been filed with the UWMP in all locations where it is made publicly available, including the California State Library. Errata may be submitted to State Library via email to [email protected] Name and agency of the person filing errata sheet: Amparo Flores Name Zone 7 Water Agency Agency # Description of Correction Location Rationale Date Error Corrected 1 Add the sentence in the first Page 6-7 Clearly state that the April 28, 2017 paragraph, after the sentence basin is not adjudicated. “DWR has not identified Basin 2- 10 as either in overdraft or expected to be in overdraft.”: “The Livermore Valley Groundwater Basin is not adjudicated.” 2 The percentage of normal for a Table 7-9 in the Incorrect calculation. April 28, 2017 single-dry year (2014) for the UWMP (DWR California Water Fix should be Table 7-1W) changed to 60% from 27%. 2015 URBAN WATER MANAGEMENT PLAN Zone 7 Water Agency 100 North Canyons Parkway Livermore, CA 94551 (925) 454-5000 March 31, 2016 Prepared by: ZONE 7 WATER AGENCY STAFF Contributors: Boni Brewer – Communications Specialist Jarnail Chahal, P.E. – Manager of Engineering Tami Church – Assistant Water Resources Planner, Integrated Planning Gurpal Deol – Water Quality Manager Jill Duerig, P.E. – General Manager Amparo Flores, P.E. – Associate Engineer, Integrated Planning JaVia Green – Staff Analyst, Finance Matt Katen, P.G. – Groundwater Services Manager Brad Ledesma, P.E. – Associate Engineer, Integrated Planning Carol Mahoney, P.G. – Manager of Integrated Water Resources Robyn Navarra – Water Conservation Coordinator Angela O’Brien, P.E. – Associate Engineer, Water Quality Tom Rooze, P.G. – Associate Geologist, Groundwater Services Sal Segura, P.E. – Associate Engineer, Integrated Planning Osborn Solitei – Assistant General Manager, Finance Report Contact: Amparo Flores, (925) 454-5019, [email protected] TABLE OF CONTENTS 1 Introduction and Overview ................................................................................................... 1-1 1.1 Purpose ................................................................................................................................................... 1-1 1.2 Previous UWMPs ................................................................................................................................ 1-1 1.3 Changes from 2010 UWMP ............................................................................................................ 1-2 1.4 Plan Contents and Organization ................................................................................................... 1-2 2 Plan Preparation: Agency Coordination and Public Participation ......................... 2-1 2.1 Basis for Preparing a Plan ............................................................................................................... 2-1 2.2 Individual Compliance ...................................................................................................................... 2-1 2.3 Calendar Year and Unit of Measure ............................................................................................ 2 - 1 2.4 Coordination and Outreach ............................................................................................................ 2-2 3 Service Area and System Description ................................................................................ 3-1 3.1 Overview ................................................................................................................................................ 3-1 3.2 Service Area .......................................................................................................................................... 3-3 3.3 Service Area Climate ......................................................................................................................... 3-5 3.4 Service Area Population and Demographics .......................................................................... 3-7 3.5 Water System Facilities .................................................................................................................... 3-8 4 System Water Use ..................................................................................................................... 4-1 4.1 Water Uses by Sector ........................................................................................................................ 4-1 5 Reducing Per Capita Water Usage ...................................................................................... 5-1 6 Water Supplies and Storage .................................................................................................. 6-1 6.1 Imported Water: State Water Project ........................................................................................ 6-2 6.2 Local Surface Water: Arroyo Valle .............................................................................................. 6-5 6.3 Groundwater ........................................................................................................................................ 6-6 6.4 Water Transfer: Byron Bethany Irrigation District .......................................................... 6-16 6.5 Local Storage ..................................................................................................................................... 6-16 6.6 Non-Local Storage ........................................................................................................................... 6-18 6.7 Wastewater and Recycled Water .............................................................................................. 6-19 6.8 Future Water Projects ................................................................................................................... 6-22 6.9 Summary of Existing and Planned Sources of Water ....................................................... 6-26 6.10 Climate Change Impacts ............................................................................................................... 6-29 7 Water Supply Reliability Assessment ................................................................................ 7-1 7.1 Constraints on Water Sources ....................................................................................................... 7-1 7.2 Reliability By Type of Year ............................................................................................................. 7-6 7.3 Supply and Demand Assessment .............................................................................................. 7-19 7.4 Regional Supply Reliability ......................................................................................................... 7-26 8 Water Shortage Contingency Planning ............................................................................. 8-1 8.1 Stages of Action ................................................................................................................................... 8-1 8.2 Consumption Reduction Methods by Agencies ..................................................................... 8-3 8.3 Determining Reductions .................................................................................................................. 8-4 8.4 Revenue and Expenditure Impacts ............................................................................................. 8-4 8.5 Adoption Resolution.......................................................................................................................... 8-6 8.6 Catastrophic Water Supply Interruption ................................................................................. 8-6 8.7 Minimum Water Supply for Next Three Years ....................................................................... 8-8 9 Demand Management Measures ......................................................................................... 9-1 10 Plan Adoption, Submittal & Implementation ............................................................... 10-1 10.1 Inclusion of All 2015 Data ............................................................................................................ 10-1 10.2 Notice of Public Hearing ............................................................................................................... 10-1 10.3 Public Hearing and Adoption ..................................................................................................... 10-1 10.4 Plan Submittal ................................................................................................................................... 10-2 10.5 Public Availability ............................................................................................................................ 10-2 10.6 Plan Implementation ...................................................................................................................... 10-2 10.7