Santa Clarita Valley Water
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April 2021 2020 Urban Water Management Plan for Santa Clarita Valley Water Agency (Los Angeles County Waterworks District No. 36/Cooperating Agency) VOLUME 1 PUBLIC DRAFT 2775 North Ventura Road, Suite 202 Oxnard, California 93036 805-973-5700 Santa Clarita Valley Water Agency 2020 Urban Water Management Plan 27 April 2021 Prepared for Santa Clarita Valley Water Agency 27234 Bouquet Canyon Road Santa Clarita, CA 91350 KJ Project No. 2044228*00 Table of Contents List of Tables ................................................................................................................................ vi List of Figures.............................................................................................................................. vii List of Appendices ....................................................................................................................... viii Section 1: Introduction, Plan Preparation, Plan Adoption and Lay Description ................................................................................ 1-1 1.1 Overview ............................................................................................. 1-1 1.2 Purpose ............................................................................................... 1-1 1.2.1 Relationship to Water Shortage Contingency Plan .................. 1-3 1.3 Basis for Preparing a Plan ................................................................... 1-3 1.4 Implementation of the Plan.................................................................. 1-3 1.4.1 Public Water Systems .............................................................. 1-4 1.4.2 Agencies Serving Multiple Service Areas/Public Water Systems ................................................................................... 1-4 1.4.3 Fiscal or Calendar Year ........................................................... 1-4 1.4.4 Coordination During Preparation of the Plan ........................... 1-4 1.4.5 Plan Adoption ........................................................................... 1-8 1.4.6 Public Outreach........................................................................ 1-8 1.4.7 Resources Maximization .......................................................... 1-9 1.5 Water Management within SCV Water’s Service Area ..................... 1-10 1.6 Climate .............................................................................................. 1-12 1.7 Potential Effects of Climate Change.................................................. 1-14 1.8 Fundamental Findings of the Urban Water Management Plan ......... 1-15 Section 2: Water Use Characterization ...................................................... 2-1 2.1 Overview ............................................................................................. 2-1 2.2 Demographics and Socioeconomics ................................................... 2-2 2.3 Land Uses in the Service Area ............................................................ 2-3 2.4 Population ........................................................................................... 2-3 2.4.1 Historical Population ................................................................ 2-3 2.4.2 Population Projections ............................................................. 2-4 2.4.3 Comparison to City and County Planning ................................ 2-5 2.5 Non-Potable Versus Potable Water Use ............................................. 2-6 2.6 Past, Current, and Projected Water Use by Sector ............................. 2-6 2.6.1 Historical Water Use ................................................................ 2-6 2.6.2 Distribution System Water Loss ............................................... 2-9 2.7 Projected Water Use ......................................................................... 2-10 2.7.1 Potable Water Use Projections .............................................. 2-10 2.7.2 Non-Potable Water Use Projections ...................................... 2-12 2.8 Characteristic Five-Year Water Use .................................................. 2-16 2.9 Water Use for Lower Income Households ......................................... 2-16 2.10 Other Factors Affecting Water Usage ............................................... 2-18 Santa Clarita Valley Water Agency 2020 UWMP i g:\projects\2020\2044228.00-scvwa-2020 uwmp update\09-reports\9.09-reports\scvwa 2020 uwmp_master file_new draft.docx Table of Contents (cont'd) Section 3: SBX7-7 Baseline, Targets, and 2020 Compliance .................... 3-1 3.1 Existing and Target Per Capita Water Use ......................................... 3-1 3.1.1 Urban Water Use Targets for SBX7-7 Reduction .................... 3-3 3.1.2 2020 Target Compliance .......................................................... 3-4 Section 4: Water Resources ....................................................................... 4-1 4.1 Overview ............................................................................................. 4-1 4.2 Wholesale (Imported) Water Supplies ................................................. 4-4 4.2.1 State Water Project Supplies ................................................... 4-4 4.2.1.1 SWP Facilities ........................................................ 4-4 4.2.1.2 SWP Water Supply Contract Amendments ........... 4-5 4.2.1.3 SWP Water Supplies ............................................. 4-6 4.2.1.4 Factors Affecting SWP Table A Supplies ............... 4-8 4.2.1.5 Biological Opinion ................................................ 4-10 4.2.1.6 SWP Table A Supply Assessment ....................... 4-12 4.2.1.7 SWP Water Supply Estimates ............................. 4-13 4.2.1.8 Coordinated Operations Agreement .................... 4-15 4.2.1.9 Delta Conveyance Project ................................... 4-15 4.2.1.10 Emergency Freshwater Pathway Description (Sacramento-San Joaquin Delta) ........................ 4-15 4.2.1.11 Sisk Dam Raise and San Luis Reservoir Expansion ............................................................ 4-17 4.2.1.12 Sites Reservoir .................................................... 4-17 4.2.1.13 SWP Seismic Improvements ............................... 4-18 4.2.1.14 Water Quality Control Plan/Voluntary Agreement ........................................................... 4-18 4.2.2 Delta Reliance ........................................................................ 4-19 4.2.3 Other Imported Supplies ........................................................ 4-20 4.2.3.1 Buena Vista-Rosedale Rio Bravo ........................ 4-20 4.2.3.2 Nickel Water - Newhall Land................................ 4-20 4.2.3.3 Yuba Accord Water .............................................. 4-21 4.3 Groundwater ..................................................................................... 4-23 4.3.1 Santa Clara River Groundwater Basin – East Subbasin ........ 4-23 4.3.2 Groundwater Management Planning ..................................... 4-24 4.3.2.1 Groundwater Sustainability Plan .......................... 4-24 4.3.2.2 Groundwater Management Plan .......................... 4-24 4.3.2.3 Available Groundwater Supplies .......................... 4-27 4.3.2.4 Alluvium ............................................................... 4-33 4.3.2.5 Saugus Formation ............................................... 4-40 4.3.3 Existing and Planned Groundwater Pumping ........................ 4-48 4.3.3.1 Impacted Well Capacity ....................................... 4-48 4.3.3.2 Alluvium ............................................................... 4-49 4.3.3.3 Saugus Formation ............................................... 4-50 4.3.3.4 Summary ............................................................. 4-50 Santa Clarita Valley Water Agency 2020 UWMP ii g:\projects\2020\2044228.00-scvwa-2020 uwmp update\09-reports\9.09-reports\scvwa 2020 uwmp_master file_new draft.docx Table of Contents (cont'd) 4.4 Transfers and Exchanges ................................................................. 4-54 4.4.1 Core Transfers ....................................................................... 4-54 4.4.2 Spot Market Transfers ............................................................ 4-54 4.4.3 Option Contracts .................................................................... 4-55 4.4.4 Future Market Transfers ......................................................... 4-55 4.4.5 Water Exchanges ................................................................... 4-55 4.5 Groundwater Banking Programs ....................................................... 4-56 4.5.1 Semitropic Banking Program ................................................. 4-57 4.5.2 Rosedale-Rio Bravo Banking Program .................................. 4-58 4.5.3 Semitropic Banking Program – Newhall Land ........................ 4-59 4.5.4 Other Opportunities ................................................................ 4-59 4.6 Planned Water Supply Projects and Programs ................................. 4-60 4.7 Development of Desalination ............................................................ 4-60 4.7.1 Opportunities for Brackish Water and/or Groundwater Desalination ........................................................................... 4-60 4.7.2 Opportunities for Seawater Desalination ................................ 4-61 4.8 Energy Intensity ...............................................................................