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 SACRAMENTO RIVER HYDROLOGIC REGION The Sacramento River Hydrologic Region Groundwater Update is dedicated to the memory of our friend and colleague Dean Crippen, whose efforts in the field of groundwater monitoring helped further implement sustainable groundwater management in California. Chapter 7. Sacramento River Hydrologic Region Chapter 7. Sacramento River Hydrologic Region — Table of Contents Chapter 7. Sacramento River Hydrologic Region Groundwater Update .............................................. i Introduction ...............................................................................................................................................1 Findings, Data Gaps, and Recommendations ............................................................................................2 Findings .................................................................................................................................................2 Groundwater Supply and Development ............................................................................................4 Groundwater Use and Aquifer Conditions ........................................................................................4 Groundwater Monitoring Efforts .......................................................................................................5 Groundwater Management and Conjunctive Management ...............................................................5 Data Gaps ..............................................................................................................................................6 Data Collection and Analysis ............................................................................................................6 Basin Assessments.............................................................................................................................6 Sustainable Management ...................................................................................................................7 Recommendations .................................................................................................................................7 Groundwater Supply and Development ....................................................................................................8 Alluvial Aquifers ...................................................................................................................................8 Sacramento Valley Groundwater Basin ..........................................................................................12 Redding Area Groundwater Basin ...................................................................................................13 Alturas Area, Big Valley, and Fall River Valley Groundwater Basins ...........................................13 Irrigation Pump Performance ..........................................................................................................14 Land Subsidence and Aquifer Compaction .....................................................................................16 Fractured-Rock Aquifers .....................................................................................................................17 Well Infrastructure...............................................................................................................................17 CASGEM Basin Prioritization ............................................................................................................22 Groundwater Use .....................................................................................................................................25 2005-2010 Average Annual Groundwater Supply ..............................................................................26 Groundwater Use by County Boundaries ........................................................................................29 Change in Annual Groundwater Use ...............................................................................................30 Groundwater Monitoring Efforts .............................................................................................................32 Groundwater-level Monitoring ............................................................................................................33 Groundwater Quality Monitoring ........................................................................................................38 Land Subsidence Monitoring ..............................................................................................................40 Borehole Extensometer Monitoring ................................................................................................41 GPS Subsidence Monitoring ...........................................................................................................41 Subsidence Monitoring Gaps ..........................................................................................................42 Aquifer Conditions ..................................................................................................................................44 Groundwater Occurrence and Movement............................................................................................45 Depth to Groundwater .....................................................................................................................46 Groundwater Elevations ..................................................................................................................48 Groundwater-level Trends ...............................................................................................................52 Hydrograph 38N07E23E001M....................................................................................................52 Hydrograph 24N02W24D002-4M ..............................................................................................53 i California's Groundwater Update 2013: A Compilation of Enhanced Content for California Water Plan Update 2013 Hydrograph 23N03W13C003-7M .............................................................................................. 53 Hydrograph 21N03W33A004M ................................................................................................. 56 Hydrograph 22N01E28J003M .................................................................................................... 57 Hydrograph 14N01E14G001M ................................................................................................... 58 Hydrograph 15N04E28D001M ................................................................................................... 58 Hydrograph 10N01W06D001M ................................................................................................. 59 Hydrograph 06N01W24N001M ................................................................................................. 59 Hydrograph 07N06E08H001M ................................................................................................... 60 Change in Groundwater in Storage ..................................................................................................... 60 Spring 2005 to Spring 2010 Change in Groundwater in Storage .................................................... 62 Groundwater Quality .......................................................................................................................... 66 Groundwater Quality at Community Drinking Water Wells .......................................................... 67 Groundwater Quality - GAMA Priority Basin Project ................................................................... 68 Groundwater Quality at Domestic Wells ........................................................................................ 73 Groundwater Quality Protection ..................................................................................................... 73 Groundwater Quality Protection Strategy ................................................................................... 75 Salt and Nutrient Management Plans .......................................................................................... 75 Land Subsidence ................................................................................................................................. 76 Groundwater Management ...................................................................................................................... 78 Groundwater Management Plan Inventory ......................................................................................... 81 Groundwater Management Plan Assessment ...................................................................................... 89 Required GWMP Components ....................................................................................................... 89 Basin Management Objectives .................................................................................................... 92 Monitoring Protocols .................................................................................................................. 92 Voluntary GWMP Components ...................................................................................................... 92 Bulletin 118-2003 Recommended