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Groundwater Update 2013 Chapter 4 San Francisco

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Groundwater Update 2013 Chapter 4 San Francisco California’s Groundwater Update 2013 A Compilation of Enhanced Content for California Water Plan Update 2013 April 2015 State of California Natural Resources Agency Department of Water Resources SAN FRANCISCO BAY HYDROLOGIC REGION Chapter 4. San Francisco Bay Hydrologic Region Contents Chapter 4. San Francisco Bay Hydrologic Region Groundwater Update ................................ 1 Introduction .................................................................................................................................. 1 Findings, Data Gaps, and Recommendations .............................................................................. 3 Findings ................................................................................................................................... 3 Groundwater Supply and Development ............................................................................... 3 Groundwater Use and Aquifer Conditions ........................................................................... 3 Groundwater Monitoring Efforts ......................................................................................... 4 Groundwater Management and Conjunctive Management .................................................. 4 Data Gaps ................................................................................................................................. 5 Data Collection and Analysis ............................................................................................... 5 Basin Assessments ............................................................................................................... 5 Sustainable Management ..................................................................................................... 6 Recommendations .................................................................................................................... 6 Groundwater Supply and Development ....................................................................................... 7 Alluvial Aquifers ..................................................................................................................... 7 North Bay Alluvial Aquifers .............................................................................................. 10 South Bay Alluvial Aquifers .............................................................................................. 11 East Bay Alluvial Aquifers ................................................................................................ 12 Fractured-Rock Aquifers ....................................................................................................... 12 Well Infrastructure ................................................................................................................. 13 CASGEM Basin Prioritization ............................................................................................... 17 Groundwater Use ....................................................................................................................... 20 2005-2010 Average Annual Groundwater Supply................................................................. 20 Groundwater Use by Planning Area Boundaries ............................................................... 21 Groundwater Use by County Boundaries .......................................................................... 22 Change in Annual Groundwater Use ................................................................................. 23 Groundwater Monitoring Efforts ............................................................................................... 25 Groundwater Level Monitoring ............................................................................................. 26 Groundwater-Quality Monitoring .......................................................................................... 29 Land Subsidence Monitoring ................................................................................................. 32 Aquifer Conditions ..................................................................................................................... 32 Groundwater Occurrence and Movement .............................................................................. 33 Depth to Groundwater ........................................................................................................ 33 Groundwater Elevations ..................................................................................................... 34 Groundwater Level Trends ................................................................................................ 34 Hydrograph 06N04W27L002M and 05N03W05M001M ............................................. 38 Hydrograph 04N05W02B001M .................................................................................... 38 Hydrograph LMMW-1S ................................................................................................ 39 Hydrograph 04S01W30E003M ..................................................................................... 39 Hydrograph 07S01E07R013M ...................................................................................... 39 Change in Groundwater in Storage ........................................................................................ 40 Groundwater Quality ............................................................................................................. 40 Groundwater Quality at Community Drinking Water Wells ............................................. 42 Groundwater Quality at Domestic Wells ........................................................................... 44 i California's Groundwater Update 2013: A Compilation of Enhanced Content for California Water Plan Update 2013 Groundwater Quality — GAMA Priority Basin Project .................................................... 44 Groundwater Quality Protection ........................................................................................ 47 Land Subsidence .................................................................................................................... 47 Groundwater Management ......................................................................................................... 48 Groundwater Management Plan Inventory ............................................................................ 49 Groundwater Management Plan Assessment ......................................................................... 51 Required GWMP Components .......................................................................................... 52 Basin Management Objectives ....................................................................................... 54 Mapping ......................................................................................................................... 54 Monitoring Protocols ..................................................................................................... 54 Voluntary GWMP Components ......................................................................................... 54 GWMP Components Recommended by Bulletin 118-2003 .............................................. 56 DWR/ACWA Survey — Key Factors for Successful GWMP Implementation ................ 57 DWR/ACWA Survey — Key Factors Limiting GWMP Success ..................................... 57 Groundwater Ordinances ....................................................................................................... 58 Special Act Districts .............................................................................................................. 59 Court Adjudication of Groundwater Rights ........................................................................... 60 Other Groundwater Management Planning Efforts ............................................................... 60 Integrated Regional Water Management Plans .................................................................. 60 Urban Water Management Plans ....................................................................................... 63 Agricultural Water Management Plans .............................................................................. 63 Conjunctive Management Inventory .......................................................................................... 64 Conjunctive Management Inventory Results ......................................................................... 65 References .................................................................................................................................. 66 Tables Table 4-1 Alluvial Groundwater Basins and Subbasins in the San Francisco Bay Hydrologic Region ....................................................................................................................... 9 Table 4-2 Number of Well Logs, According to Well Use and County for the San Francisco Bay Hydrologic Region (1977-2010) ................................................................. 14 Table 4-3 CASGEM Prioritization for Groundwater Basins in the San Francisco Bay Hydrologic Region ..................................................................................................................... 18 Table 4-4 Average Annual Total Water Supply Met by Groundwater, According to Planning Area and Type of Use, for the San Francisco Bay Hydrologic Region (2005-2010) ................ 21 Table 4-5 Average Annual Total Water Supply Met by Groundwater, According to
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