Greater Tehachapi Area - 2015 Regional Urban Water Management Plan Draft - May 2016 Tehachapi-Cummings County Water District Bear Valley Community Services District City of Tehachapi Golden Hills Community Services District Stallion Springs Community Services District Table of Contents _____________________________________________________________________________________ Section 1 : Introduction ............................................................................................................................. 1-1 1.01 Background and Purpose ................................................................................................ 1-1 1.02 Report Organization......................................................................................................... 1-2 1.03 Compliance with 2015 Water Use Targets ...................................................................... 1-3 Section 2 Tehachapi Cummings-County Water District ............................................................................ 2-1 2.01 Plan Preparation .............................................................................................................. 2-1 2.01.1 Agency Identification .......................................................................................... 2-1 2.01.2 Coordination and Outreach ................................................................................ 2-1 2.02 System Description .......................................................................................................... 2-2 2.02.1 General Description ............................................................................................ 2-2 2.02.2 Service Area Climate .......................................................................................... 2-3 2.02.3 Service Area Population ..................................................................................... 2-4 2.03 System Water Use ........................................................................................................... 2-5 2.03.1 Water Use ........................................................................................................... 2-5 2.03.2 Distribution System Water Losses ...................................................................... 2-7 2.03.3 Climate Change .................................................................................................. 2-8 2.04 Baselines and Targets ..................................................................................................... 2-8 2.04.1 Updating Calculations from 2010 UWMP ........................................................... 2-8 2.04.2 Baseline Periods ................................................................................................. 2-9 2.04.3 Service Area Population ..................................................................................... 2-9 2.04.4 Gross Water Use ................................................................................................ 2-9 2.04.5 Baseline Daily Per Capita Water Use ............................................................... 2-10 2.04.6 2015 and 2020 Targets .................................................................................... 2-10 2.04.7 2015 Compliance Daily per Capita Water Use (GPCD) ................................... 2-10 2.05 System Supplies ............................................................................................................ 2-11 2.05.1 Purchased or Imported Water .......................................................................... 2-11 2.05.2 Groundwater ..................................................................................................... 2-12 2.05.3 Surface Water ................................................................................................... 2-15 2.05.4 Stormwater ....................................................................................................... 2-15 2.05.5 Wastewater and Recycled Water ..................................................................... 2-16 2.05.6 Desalinated Water Opportunities ...................................................................... 2-17 2.05.7 Exchanges and Transfers ................................................................................. 2-17 Greater Tehachapi Area - 2015 i Regional Urban Water Management Plan 2.05.8 Future Water Projects ....................................................................................... 2-17 2.05.9 Summary of Existing and Planned Sources of Water ...................................... 2-18 2.05.10 Climate Change Impacts to Supply .................................................................. 2-19 2.06 Water Supply Reliability Assessment ............................................................................ 2-19 2.06.1 Constraints on Water Sources .......................................................................... 2-19 2.06.2 Reliability by Type of Year ................................................................................ 2-20 2.06.3 Supply and Demand Assessment .................................................................... 2-22 2.06.4 Regional Water Supply Reliability .................................................................... 2-24 2.07 Water Shortage Contingency Planning ......................................................................... 2-24 2.07.1 Stages of Action ................................................................................................ 2-24 2.07.2 Consumption Reduction Measures .................................................................. 2-25 2.07.3 Determining Water Shortage Reductions ......................................................... 2-25 2.07.4 Revenue and Expenditure Impacts .................................................................. 2-25 2.07.5 Resolution or Ordinance ................................................................................... 2-26 2.07.6 Catastrophic Supply Interruption ...................................................................... 2-26 2.07.7 Minimum Supply Next Three Years .................................................................. 2-27 2.08 Demand Management Measures .................................................................................. 2-28 2.08.1 Metering ............................................................................................................ 2-28 2.08.2 Public Education and Outreach ........................................................................ 2-29 2.08.3 Water Conservation Program Coordination and Staffing Support ................... 2-29 2.08.4 Other Demand Management Measures ........................................................... 2-30 2.08.5 Asset Management ........................................................................................... 2-31 2.08.6 Wholesale Supplier Assistance Programs ....................................................... 2-32 2.08.7 Implementation over the Past Five Years ........................................................ 2-34 2.08.8 Planned Implementation to Achieve Water Use Targets ................................. 2-34 2.08.9 Members of the California Urban Water Conservation Council ....................... 2-34 2.08.10 Voluntary Reporting of Energy Intensity ........................................................... 2-34 2.09 Plan Adoption, Submittal and Implementation .............................................................. 2-35 2.09.1 Public Notice ..................................................................................................... 2-35 2.09.2 Plan Adoption, Submittal, and Implementation ................................................ 2-36 Section 3 Bear Valley CSD ........................................................................................................................ 3-1 3.01 Plan Preparation .............................................................................................................. 3-1 3.01.1 Agency Identification .......................................................................................... 3-1 3.01.2 Coordination and Outreach ................................................................................ 3-1 3.02 System Description .......................................................................................................... 3-2 Greater Tehachapi Area - 2015 ii Regional Urban Water Management Plan 3.02.1 General Description ............................................................................................ 3-2 3.02.2 Service Area Climate .......................................................................................... 3-2 3.02.3 Service Area Population ..................................................................................... 3-3 3.03 System Water Use ........................................................................................................... 3-3 3.03.1 Water Use ........................................................................................................... 3-3 3.03.2 Distribution System Water Losses ...................................................................... 3-5 3.03.3 Water Use for Lower Income Households/Future Water Savings ...................... 3-5 3.03.4 Climate Change .................................................................................................. 3-6 3.04 Baselines and Targets ....................................................................................................