2010 URBAN WATER MANAGEMENT PLAN City of Coachella Prepared By: TKE Engineering and Planning 2305 Chicago Avenue Riverside, CA 92507 (951) 680-0440 Draft June 2011 City of Coachella 2010 Urban Water Management Plan TABLE OF CONTENTS Section Page Acronyms and Abbreviations .............................................................................. ACR-1 1 Urban Water Management Plan Preparation 1.1 Purpose and UWMP Summary ............................................................ 1-1 1.2 Agency Coordination and Public Participation ....................................... 1-2 1.3 UWMP Update Preparation ................................................................... 1-4 1.4 UWMP Adoption, Submittal, and Implementation .................................. 1-4 2 System Description 2.1 Service Area Description ....................................................................... 2-1 2.1.1 Facilities ....................................................................................... 2-3 2.1.2 Climate ......................................................................................... 2-5 2.2 Service Area Population ........................................................................ 2-5 2.2.2 Demographics .............................................................................. 2-6 3 System Demands 3.1 Water Demands .................................................................................... 3-1 3.1.1 Past and Current Water Use ........................................................ 3-1 3.1.2 Water Demand Projections ........................................................... 3-3 3.1.3 Residential Sector ........................................................................ 3-4 3.1.4 Non-Residential Sector................................................................. 3-6 3.1.5 Landscape.................................................................................... 3-6 3.1.6 Agriculture .................................................................................... 3-6 3.2 Baselines and Targets........................................................................... 3-7 3.3 Water Use Reduction Plan .................................................................... 3-9 4 System Supplies 4.1 Existing Water Supplies ........................................................................ 4-1 4.2 Groundwater ......................................................................................... 4-1 4.2.1 Groundwater Quality .................................................................... 4-5 4.2.1.1 Total Dissolved Solids (TDS) .............................................. 4-5 4.2.1.2 Fluoride .............................................................................. 4-6 4.2.1.3 Perchlorate ......................................................................... 4-7 4.2.1.4 Arsenic ............................................................................... 4-7 4.3 State Water Project (SWP) .................................................................... 4-8 4.4. Colorado River Water .......................................................................... 4-10 4.4.1 Coachella Canal Water Quality ................................................... 4-12 4.4.1.1 Total Dissolved Solids (TDS) ............................................ 4-12 4.4.1.2 Fluoride ............................................................................ 4-13 4.5 Transfer and Exchange Opportunities ................................................. 4-13 4.6 Desalinated Water Opportunities ......................................................... 4-15 4.7 Recycled Water Opportunities ............................................................. 4-17 4.7.1 Introduction ................................................................................ 4-17 4.7.2 Wastewater Generation, Collection, and Treatment ................... 4-18 4.7.3 Recycled Water Benefits and Uses ............................................ 4-18 TOC-1 City of Coachella 2010 Urban Water Management Plan 4.7.4 Recycled Water Currently Planned Uses .................................... 4-18 4.7.5 Potential Uses of Recycled Water .............................................. 4-19 4.7.6 Encouraging Recycled Water Use .............................................. 4-19 4.7.7 Recycled Water Optimization Plan ............................................. 4-20 4.8 Future Water Projects ......................................................................... 4-20 5 Water Supply Reliability and Water Shortage Contingency Planning 5.1 Water Supply Reliability ........................................................................ 5-1 5.1.1 Water Management Tools and Options to Maximize Resources ... 5-3 5.2 Water Service Supply and Demand Reliability Comparison .................. 5-3 5.3 Plans to Assure a Reliable Water Supply ............................................ 5-12 5.3.1 City of Coachella Projects and Programs ................................... 5-12 5.3.2 Coachella Valley Water District Projects and Programs.............. 5-12 5.3.2.1 State Water Project (SWP) ............................................... 5-12 5.3.2.2 Colorado River Water Qualification Settlement Agreement ........................................................................ 5-16 5.3.2.3 Coachella Valley Water Management Plan 2010 .............. 5-18 5.3.3 Regional Water Quality Control board – Region 7 ...................... 5-18 5.4 Water Shortage Contingency Planning………………………………… 5-19 5.4.1 Introduction ................................................................................ 5-19 5.4.2 Stages of Action ......................................................................... 5-19 5.4.3 Expected Minimum Water Supply .............................................. 5-21 5.4.4 Actions During a Catastrophic Interruption ................................. 5-21 5.4.5 Prohibitions, Consumption Reduction Method’s, and Penalties .. 5-23 5.4.6 Revenue and Expenditure Impacts and Measure to Overcome Impacts. .............................................................................................. 5-25 5.4.7 Water Shortage Contingency Ordinance/Resolution ................... 5-26 5.4.8 Mechanism to Determine Reduction in Water Use ..................... 5-27 5.5 Drought Planning ................................................................................ 5-27 6 Demand Management Measures 6.1 Introduction ........................................................................................... 6-1 6.2 Determination of Demand Management Measure’s Implementation...... 6-2 6.3 Demand Management Measures .......................................................... 6-3 7 Climate Change 7.1 Vulnerability of Supply for Seasonal or Climatic Shortage ..................... 7-1 8 UWMP Checklist 8.1 UWMP Checklist ................................................................................... 8-1 TOC-2 City of Coachella 2010 Urban Water Management Plan APPENDICES Appendix A References Appendix B DWR Review for Completeness Form Appendix C DWR Review for DMM Completeness Form Appendix D Notice of Public Hearing and Resolution of Plan Adoption Appendix E Water Prohibition Resolution Appendix F UWMP Checklist TOC-3 City of Coachella 2010 Urban Water Management Plan TABLES 1.2-1 Agency Coordination and Public Involvement in UWMP Development ....................... 1-3 2.2-1 City of Coachella Population Projections ..................................................................... 2-3 2.3-1 City of Coachella Area Climate .................................................................................... 2-4 3.1.1-1 City of Coachella Active and Planned Wells ................................................................ 3-3 3.2-1 Current and Projected Water Supplies, Operational Changes Implemented ................................................................................................................ 3-5 3.4-1 Summary of Coachella Canal Water Quality................................................................ 3-8 4.1-1 Supply Reliability during the Next Three Years ........................................................... 4-2 4.1-2 Basis of Water Year Data ............................................................................................. 4-2 4.1-3 Supply Inconsistency Factors....................................................................................... 4-2 4.2.1-1 Estimated Groundwater Production Within Lower Whitewater River Subbasin ........... 4-3 4.2.2-1 State Water Project Water Sources ............................................................................. 4-4 4.2.2-2 Department of Water Resources Table A Water Allocations 1988-2007 ..................... 4-5 4.2.3-1 Priorities and Water Delivery Contracts California Seven Party Agreement of 1931 .. 4-6 4.2.3-2 Historical Coachella Canal Deliveries .......................................................................... 4-7 4.4.2.1-1 Long Term Average SWP Delivery Reliability ............................................................ 4-10 4.4.2.1-2 Summary of Future SWP Supplies ............................................................................ 4-10 4.4.2.2-1 CVWD Deliveries Under the QSA .............................................................................. 4-11 4.4.4-1 Transfer and Exchange Opportunities ....................................................................... 4-13 5.1-1 Past, Current, and Project Water Use