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Southeast California Regional Basin Study

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Southeast California Regional Basin Study Summary Report Southeast California Regional Basin Study U.S. Department of the Interior Bureau of Reclamation September 2015 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. Summary Report Southeast California Regional Basin Study Prepared by: Southern California Area Office Greg Krzys, Water Resources Planner Denver Technical Service Center Laura Condon, Hydrologic Engineer Subhrendu Gangopadhyay, Hydrologic Engineer Alan Harrison, Environmental Engineer U.S. Department of the Interior Bureau of Reclamation September 2015 Contents Page Acronyms ............................................................................................................... v Summary ................................................................................................................ 1 Introduction ........................................................................................................... 3 Authority ........................................................................................................... 5 Purpose, Scope and Objectives of the Study .................................................... 6 Goals and Objectives .................................................................................. 6 Setting ......................................................................................................... 7 Climate ........................................................................................................ 9 Water Supply .............................................................................................. 9 Water Quality ............................................................................................ 10 Lands ......................................................................................................... 10 Flora and Fauna......................................................................................... 11 Culture....................................................................................................... 12 Socio-Economic Characteristics ............................................................... 12 Collaboration and Outreach ............................................................................ 14 Previous and Current Studies and Interrelated Activities ............................... 14 Water Supply ....................................................................................................... 16 Descriptions of Groundwater and Surface Water Supply ............................... 16 Coachella Valley ....................................................................................... 17 Imperial Valley ......................................................................................... 18 Borrego Springs ........................................................................................ 19 Water Supply Analysis Approach ................................................................... 19 Local Surface Water Supply ..................................................................... 19 Imported Supply........................................................................................ 20 Effects of Climate Variability and Change on Supply.................................... 21 Local Supply ............................................................................................. 21 State Water Project Imported Water ......................................................... 24 Colorado River Imported Water ............................................................... 26 Water Demand .................................................................................................... 29 Summary of Current and Future Water Demand Estimates from Planning Documents .......................................................................................... 29 Coachella Valley ....................................................................................... 30 Imperial Valley ......................................................................................... 31 Borrego Springs ........................................................................................ 33 Approach to Climate Projections Analysis ..................................................... 33 Effects of Climate Variability and Change on Demand ................................. 34 System Reliability and Impact Assessment .................................................... 35 Water Delivery and Power Generation ..................................................... 35 Agriculture ................................................................................................ 36 Tourism & Recreation............................................................................... 37 i Fish & Wildlife ......................................................................................... 37 Water Quality ............................................................................................ 37 Adaptive Alternatives ......................................................................................... 38 Non-Structural Methods.................................................................................. 39 Structural Methods .......................................................................................... 40 Borrego to Coachella ................................................................................ 40 Borrego to Imperial ................................................................................... 40 Other Alternatives ........................................................................................... 40 Direct Coachella Valley-SWP connection ................................................ 41 Lake Henshaw ........................................................................................... 41 Borrego flood control structures ............................................................... 41 Clark Dry Lake Bed .................................................................................. 42 Desalination .............................................................................................. 42 Evaluation and Comparison of Adaptive Strategies........................................ 42 Non-Structural................................................................................................. 42 Structural Methods .......................................................................................... 45 Borrego to Coachella ................................................................................ 46 Borrego to Imperial ................................................................................... 46 Carter Reservoir ........................................................................................ 47 West Side Canal ........................................................................................ 47 Environmental Constraints and Permitting ............................................... 47 Economic Analysis ......................................................................................... 50 Findings ................................................................................................................ 53 Disclaimer ............................................................................................................ 53 References ............................................................................................................ 54 Tables Table 1: Summary of water sources by sub-area .................................................. 16 Table 2: Station locations for local supply simulation.......................................... 21 Table 3: Estimated Deliveries of SWP Table A Contract Water for a range of hydrologic conditions.................................................................................... 25 Table 4: Estimated SWP Table A delivery amounts to Coachella Valley ............ 26 Table 5: Summary of Colorado River streamflow projections for the four supply scenarios ........................................................................................................ 28 Table 6: Percent of vulnerable years across all supply scenarios for several Colorado River water delivery metrics across three future time periods for the Baseline and four portfolios .................................................................... 29 Table 7: Summary of current water demand for each Southeast California sub- area ................................................................................................................ 30 Table 8: Coachella Valley water demand projections .......................................... 31 Table 9: Non-Agricultural Imperial Valley water demand projections ................ 32 Table 10: Current demand (as of 2002) for Borrego Springs ............................... 33 Table 11: Total cost per acre-foot of water supplied over 50 years by project alternatives .................................................................................................... 52 ii Figures Figure 1: Inland Basins Project 1968 Interim Report showing route alignments for new sources of water ......................................................................................
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