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2015 Urban Water Management Plan

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2015 Urban Water Management Plan Prepared for Sonoma County Water Agency 2015 Urban Water Management Plan June 2016 2015 Urban Water Management Plan Prepared for Sonoma County Water Agency Santa Rosa, CA June 2016 11020 White Rock Road, Suite 200 Rancho Cordova, CA 95670 Table of Contents List of Figures ........................................................................................................................................................... iii List of Tables ............................................................................................................................................................. iii List of Abbreviations .................................................................................................................................................. v 1. Introduction .................................................................................................................................................... 1-1 1.1 Urban Water Management Planning Act ........................................................................................... 1-1 1.2 Plan Organization ................................................................................................................................ 1-1 1.3 Assumptions ........................................................................................................................................ 1-2 1.3.1 Potter Valley Project .............................................................................................................. 1-2 1.3.2 Threatened and Endangered Species -- Russian River Biological Opinion ....................... 1-3 1.3.3 Future Water Supply Projects ............................................................................................... 1-4 1.3.4 Climate Change ..................................................................................................................... 1-5 2. Plan Preparation ............................................................................................................................................ 2-1 2.1 Basis for Preparing the Plan ............................................................................................................... 2-1 2.2 Coordination and Outreach ................................................................................................................ 2-2 2.2.1 Wholesaler and Retailer Coordination ................................................................................. 2-2 2.2.2 Coordination with Other Agencies and the Community ...................................................... 2-3 2.2.3 Adoption and Submittal ........................................................................................................ 2-6 3. System Description ........................................................................................................................................ 3-1 3.1 General Description ............................................................................................................................ 3-1 3.2 Service Area Climate ........................................................................................................................... 3-3 3.2.1 Climate Change ..................................................................................................................... 3-6 3.3 Service Area Population and Demographics ..................................................................................... 3-7 3.3.1 Other Demographic Factors ................................................................................................. 3-8 4. System Water Use ......................................................................................................................................... 4-1 4.1 Evaluation of Portion of Projected Total Water Demand to be met by Water Agency Supplies ..... 4-1 4.1.1 Evaluation of Water Demand Projections by Water Agency’s Water Contractors and MMWD ................................................................................................................................... 4-1 4.1.2 Evaluation of Water Demand Projections for Other Water Transmission System Customers and Russian River Customers ........................................................................... 4-2 4.2 Water Uses ........................................................................................................................................... 4-2 4.4 Climate Change ................................................................................................................................... 4-5 5. System Supplies ............................................................................................................................................ 5-1 5.1 Surface Water ...................................................................................................................................... 5-1 5.1.1 Water Rights .......................................................................................................................... 5-1 5.1.2 Surface Water Supply Facilities ........................................................................................... 5-1 5.1.3 Restructured Agreement for Water Supply ......................................................................... 5-4 5.1.4 Potter Valley Project License ................................................................................................ 5-5 i 2015 Urban Water Management Plan Contents 5.1.5 Threatened and Endangered Species -- Russian River Biological Opinion ....................... 5-5 5.1.6 Russian River System Model ................................................................................................ 5-6 5.2 Groundwater ...................................................................................................................................... 5-12 5.2.1 Water Agency’s Santa Rosa Plain Groundwater Supply ................................................... 5-12 5.2.2 Water Agency Groundwater-Related Studies/Programs .................................................. 5-17 5.3 Stormwater ........................................................................................................................................ 5-20 5.4 Wastewater and Recycled Water ..................................................................................................... 5-20 5.4.1 Recycled Water Coordination ............................................................................................. 5-21 5.4.2 Wastewater Collection, Treatment, and Disposal ............................................................. 5-21 5.4.3 Recycled Water Systems .................................................................................................... 5-22 5.5 Desalinated Water Opportunities ..................................................................................................... 5-23 5.6 Exchanges or Transfers .................................................................................................................... 5-24 5.7 Future Water Projects ....................................................................................................................... 5-24 5.8 Summary of Existing and Planned Sources of Water ...................................................................... 5-26 5.8.1 Water Supply Strategies ..................................................................................................... 5-29 5.9 Climate Change Impacts to Supply .................................................................................................. 5-29 5.10 Energy Intensity ................................................................................................................................. 5-30 6. Water Supply Reliability ................................................................................................................................. 6-1 6.1 Constraints on Water Sources ............................................................................................................ 6-1 6.2 Reliability by Type of Year ................................................................................................................... 6-1 6.3 Supply and Demand Assessment ...................................................................................................... 6-2 6.4 Regional Supply Reliability .................................................................................................................. 6-4 7. Water Shortage Contingency Planning ......................................................................................................... 7-1 7.1 Stages of Action ................................................................................................................................... 7-1 7.2 Consumption Reduction Methods ...................................................................................................... 7-3 7.3 Determining Water Shortage Reductions .......................................................................................... 7-4 7.4 Revenue and Expenditure Impacts .................................................................................................... 7-4 7.5 Resolution or Ordinance ..................................................................................................................... 7-5 7.6 Catastrophic Supply Interruption Plan ..............................................................................................
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