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Draft San Luis Reservoir Expansion Appraisal Report

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Draft San Luis Reservoir Expansion Appraisal Report San Luis Reservoir Expansion Draft Appraisal Report Central Valley Project, California Mid-Pacific Region U.S. Department of the Interior Bureau of Reclamation December 2013 Mid-Pacific Region - Planning Division U.S. Department of the Interior Bureau of Reclamation December 2013 Mid-Pacific Region - Planning Division Mission Statements The mission of the Department of the Interior is to protect and provide access to our Nation’s natural and cultural heritage and honor our trust responsibilities to Indian Tribes and our commitments to island communities. The mission of the Bureau of Reclamation is to manage, develop, and protect water and related resources in an environmentally and economically sound manner in the interest of the American public. Cover Image: Aerial view, looking west, of B.F. Sisk Dam and San Luis Reservoir. Image courtesy of DWR. San Luis Reservoir Expansion Draft Appraisal Report Central Valley Project, California Mid-Pacific Region U.S. Department of the Interior Bureau of Reclamation Mid-Pacific Region - Planning Division San Luis Reservoir Expansion - Appraisal Report December 2013 Table of Contents 1.0 EXECUTIVE SUMMARY ............................................................................................... 1 2.0 INTRODUCTION.............................................................................................................. 4 2.1 Purpose of the Appraisal Study ........................................................................................ 4 2.2 Need for the Appraisal Study ........................................................................................... 5 2.3 Authorization for Appraisal Study ................................................................................... 5 2.4 Study Area ........................................................................................................................ 6 3.0 PROBLEMS AND OPPORTUNITIES ........................................................................... 8 3.1 Problems ........................................................................................................................... 8 3.2 Opportunities .................................................................................................................. 10 3.3 Objectives ....................................................................................................................... 11 3.4 Constraints ...................................................................................................................... 11 4.0 EXISTING CONDITIONS ............................................................................................. 13 4.1 Facilities ......................................................................................................................... 13 4.1.1 Dam Embankment .................................................................................................. 13 4.1.2 Gianelli Pumping-Generating Plant ........................................................................ 15 4.1.3 Intake Towers / Trashrack Structures ..................................................................... 15 4.1.4 Trashrack Structure Access Bridge ......................................................................... 17 4.1.5 Spillway .................................................................................................................. 17 4.2 Reservoir Area-Capacity ................................................................................................ 18 4.3 Related Projects .............................................................................................................. 19 4.4 Previous Studies ............................................................................................................. 22 4.5 Influencing Contracts, Agreements, and Conditions ..................................................... 24 5.0 MANAGEMENT MEASURES ...................................................................................... 27 5.1 Non-Structural Measures................................................................................................ 27 5.2 Structural Measures ........................................................................................................ 28 5.3 Alternatives .................................................................................................................... 30 5.3.1 No Action Alternative ............................................................................................. 30 5.3.2 Conceptual Dam Raise Alternative ......................................................................... 30 ______________________________________________________________________________ i San Luis Reservoir Expansion - Appraisal Report December 2013 6.0 CONSIDERATIONS FOR STRUCTURAL MODIFICATIONS............................... 32 6.1 Intake Towers/Trashrack Structures............................................................................... 32 6.2 Trashrack Structure Access Bridge ................................................................................ 32 6.3 Spillway .......................................................................................................................... 32 7.0 WATER OPERATIONS AND BENEFITS FORECAST ............................................ 34 7.1 Existing Operations........................................................................................................ 34 7.2 Water Supply Forecast ................................................................................................... 35 7.2.1 Method 1: Spreadsheet Analysis of CalSim-II Results.......................................... 35 7.2.2 Method 2: CalLite Modeling Analysis .................................................................. 37 7.3 Summary of Results ....................................................................................................... 39 8.0 ENVIRONMENTAL ....................................................................................................... 40 9.0 COST ESTIMATES ........................................................................................................ 41 10.0 FINDINGS AND RECOMMENDATIONS .................................................................. 43 10.1 Findings.......................................................................................................................... 43 10.2 Recommendations .......................................................................................................... 44 11.0 REFERENCES................................................................................................................. 45 ATTACHMENT A B.F. Sisk Dam Increased Storage Alternatives, Appraisal Level Study: Technical Memorandum No. VB-86-68313-25 ATTACHMENT B Sisk Enlargement Appraisal Level Modeling Analysis ______________________________________________________________________________ ii San Luis Reservoir Expansion - Appraisal Report December 2013 Figures Figure 1. Major facilities of the San Luis Unit and the appraisal study area. ................................ 7 Figure 2. Typical Section of B.F. Sisk Dam ................................................................................ 14 Figure 3. Close-up of B.F. Sisk Dam and Gianelli Pumping-Generating Plant .......................... 14 Figure 4. Outlet works intake towers and access bridge .............................................................. 16 Figure 5. Overview of B.F. Sisk inlet and outlet structures ......................................................... 17 Figure 6. Area-Capacity curves for San Luis Reservoir and O'Neill Forebay ............................ 18 Figure 7. Locations of CALFED surface storage investigations relative to the Sisk study area. 23 Figure 8. Typical section of the conceptual modification alternative .......................................... 31 Figure 9. Approximate limits of spillway demolition .................................................................. 33 Figure 10. A 10 year plot of long-term San Luis reservoir volume ............................................. 34 Tables Table 1. Maximum additional annual export opportunities by water year type* ......................... 36 Table 2. Additional export opportunities stored by various capacity increases* ........................ 37 Table 3. Average Annual Additional Deliveries of CVP and SWP (TAF/yr)* ........................... 38 Table 4. Change in North-of-Delta Average End of September Storage (TAF) ......................... 38 Table 5. Summary of maximum and minimum estimated water supply benefits ....................... 39 Table 6. Summary of appraisal level field cost estimates ............................................................ 42 ______________________________________________________________________________ iii San Luis Reservoir Expansion - Appraisal Report December 2013 Acronyms and Abbreviations AF acre-feet BA Biological Assessment BDCP Bay-Delta Conservation Plan BO Biological Opinion CALFED CALFED Bay-Delta Program CA California Aqueduct CAS Corrective Action Study CEQA California Environmental Quality Act COA CVP/SWP Coordinated Operations Agreement cfs cubic-feet per second (ft3/s) CVOO Reclamation Central Valley Operations Office CVP Central Valley Project CVPIA Central Valley Project Improvement Act D-1641 SWRCB Water Right Decision 1641 DMC Delta-Mendota Canal DWR California Department of Water Resources Delta Sacramento-San Joaquin Delta
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