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ACWA Storage Integration Study

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ACWA Storage Integration Study Storage Integration Study June 2017 Prepared for Prepared by ACWA Water Storage Integration Study May 2017 Contents Executive Summary ....................................................................................................................................... 1 Findings ..................................................................................................................................................... 1 Significant Surplus Water Available ...................................................................................................... 1 Integrating Operations Expands Benefits of Proposed and Existing Storage Facilities ........................ 2 New Storage Increases Water Supply and Reliability ........................................................................... 4 Integrated Operation of New Storage Improves Groundwater Storage .............................................. 4 Significant Surplus Remains with New Storage and Improved Delta Conveyance ............................... 5 Introduction .................................................................................................................................................. 7 Water System Background ........................................................................................................................ 8 Available Surplus ................................................................................................................................... 9 Conveyance ......................................................................................................................................... 13 Analytical Approach ................................................................................................................................ 15 Integrated Operation .................................................................................................................................. 16 Overview ................................................................................................................................................. 16 Analytical Results .................................................................................................................................... 16 Delta Conveyance ....................................................................................................................................... 22 Overview ................................................................................................................................................. 22 Analytical Results .................................................................................................................................... 22 Sites Reservoir ............................................................................................................................................. 27 Overview ................................................................................................................................................. 27 Available Surplus ..................................................................................................................................... 28 Analytical Results .................................................................................................................................... 30 Centennial Reservoir ................................................................................................................................... 34 Overview ................................................................................................................................................. 34 Available Surplus ..................................................................................................................................... 34 Analytical Results .................................................................................................................................... 35 American River Conjunctive Management ................................................................................................. 38 Overview ................................................................................................................................................. 38 Available Surplus ..................................................................................................................................... 39 Analytical Results .................................................................................................................................... 41 Los Vaqueros Reservoir Expansion ............................................................................................................. 43 i ACWA Water Storage Integration Study May 2017 Overview ................................................................................................................................................. 43 Analytical Results .................................................................................................................................... 44 San Luis Reservoir Expansion ...................................................................................................................... 47 Overview ................................................................................................................................................. 47 Analytical Results .................................................................................................................................... 48 Temperance Flat ......................................................................................................................................... 51 Overview ................................................................................................................................................. 51 Available Surplus ..................................................................................................................................... 52 Analytical Results .................................................................................................................................... 53 Tulare Lake Storage and Floodwater Protection Project ............................................................................ 56 Overview ................................................................................................................................................. 56 Available Surplus ..................................................................................................................................... 56 Analytical Results .................................................................................................................................... 59 Groundwater Storage in the Kern Fan Area ............................................................................................... 61 Overview ................................................................................................................................................. 61 ii Executive Summary To inform decision making related to water storage investments, the Association of California Water Agencies (ACWA) undertook this study to define and quantify the benefits of integrating the operation of new storage projects with the existing State Water Project (SWP) and Central Valley Project (CVP). In addition to these storage projects, the study analyzed how improved Delta conveyance capability could increase the benefits of integrated operations of proposed and existing storage facilities. The integration of the projects would significantly help fulfill statewide water supply needs and priorities. This study describes new storage projects that are currently being proposed, how those projects may be integrated with existing water storage facilities and conveyance infrastructure (current and proposed), and analytical results quantifying the benefits of integrated operation of the proposed storage projects. The analytical results contained in this study were developed through the use of CalSim II and other spreadsheet modeling efforts. The study focused on assessing the benefits from both project-to-project integration and system-wide integration. The potential new storage projects considered in this study are listed in order, from north to south, below: 1. Sites Reservoir 2. Centennial Reservoir 3. American River Conjunctive Management 4. Los Vaqueros Reservoir Expansion 5. San Luis Reservoir Enlargement 6. Temperance Flat Reservoir 7. Tulare Lake Storage and Floodwater Protection Project 8. Groundwater Storage in the Kern Fan Area Findings SURPLUS WATER Significant Surplus Water Available Surplus water is defined in The study found that due to the nature of California’s highly this report as flow above variable hydrology, there are surplus flows in the system that what is necessary to satisfy all may be diverted to storage in almost every year. Figure 1 shows current water demands, that average annual surplus in the Delta watershed is about 10 including existing million acre feet (MAF). The annual surplus varies from over 22 environmental mitigation MAF in wet years to over 1 MAF in critical years. These volumes measures and compliance of surplus water available within the Delta watershed are similar obligations. This water to amounts identified by the California Department of Water cannot be captured and Resources (DWR) in its Draft Report on Water Available for stored with existing storage Replenishment (WAFR). In that report, DWR developed
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