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2017-18 Annual Monitoring and Measuring Report (PDF) Groundwater Management Plan 2017-2018 Annual Monitoring and Measurement Report Contents Table of Contents 1 Introduction .................................................................................................................................. 1-1 2 Groundwater Management Actions ........................................................................................... 2-1 2.1 GMP Component Category 1: Stakeholder Involvement Plan .............................................. 2-1 2.2 GMP Component Category 2: Monitoring Program ............................................................. 2-1 2.3 GMP Component Category 3: Groundwater Resource Protection ........................................ 2-4 2.4 GMP Component Category 4: Groundwater Sustainability .................................................. 2-4 2.5 Planned Groundwater Management Activities ...................................................................... 2-5 3 Groundwater Monitoring and Conditions Assessment ............................................................ 3-7 3.1 Hydrologic Conditions .......................................................................................................... 3-7 3.2 Groundwater Substitution Transfer, Schedule 6, and Additional Local Pumping ................ 3-7 3.2.1 Groundwater Substitution Transfer Pumping In 2008, 2009, 2010, 2013, and 2014 ........ 3-7 3.2.2 2015 Groundwater Pumping – Schedule 6, Deficiency, and Additional Local Pumping . 3-7 3.2.3 2017 Groundwater Pumping – Local Pumping ............................................................... 3-10 3.3 Elevations and Storage ........................................................................................................ 3-11 3.3.1 Comparison of Current and Historical Spring Groundwater Levels ............................... 3-17 3.3.2 Groundwater Elevation Contour Maps ............................................................................ 3-17 3.4 Groundwater Quality ........................................................................................................... 3-26 3.5 Groundwater Surface Water Interaction .............................................................................. 3-29 3.6 Compliance with Monitoring Requirements ....................................................................... 3-33 3.7 Comparison to Fall 1991 Groundwater Levels .................................................................... 3-33 3.8 Third Party Groundwater Impacts ....................................................................................... 3-35 List of Figures Figure 1. North and South Yuba Groundwater Subbasins .................................................................... 1-2 Figure 2. Yuba County Alluvial Basin Groundwater Monitoring Network .......................................... 2-3 Figure 3. Yuba County Member Units, Pumping Zone Boundaries, and Groundwater Substitution Transfer Well Locations ............................................................................................ 3-9 Figure 4. Key Groundwater Hydrographs in the North Yuba Subbasin .............................................. 3-13 Figure 5. Key Groundwater Hydrographs in the South Yuba Subbasin .............................................. 3-14 Figure 6. 2008-2017 Groundwater Hydrographs in North Yuba Subbasin ......................................... 3-15 Figure 7. 2008-2017 Groundwater Hydrographs in South Yuba Subbasin ......................................... 3-16 Figure 8. Comparison of 2018 and Historical Spring Groundwater Levels for the South Yuba Subbasin ....................................................................................................................................... 3-18 Figure 9. Comparison of 2018 and Historical Spring Groundwater Levels for the North Yuba Subbasin ....................................................................................................................................... 3-19 Figure 10. Spring 2017 Groundwater Elevations in the Yuba Subbasins ........................................... 3-20 Figure 11. Spring 2018 Groundwater Elevations in the Yuba Subbasins ........................................... 3-21 Figure 12. Fall 2016 Groundwater Elevations in the Yuba Subbasins ................................................ 3-22 Figure 13. Fall 2017 Groundwater Elevations in the Yuba Subbasins ................................................ 3-23 Figure 14. Spring 2017 to Spring 2018 Hydraulic Head Difference Map........................................... 3-24 Figure 15. Fall 2016 to Fall 2017 Hydraulic Head Difference Map ................................................... 3-25 Figure 16. Electric Conductivity Trends in Key Wells in Yuba Subbasins ........................................ 3-28 Yuba Water Agency i August 2018 Groundwater Management Plan 2017-2018 Annual Monitoring and Measurement Report Contents Figure 22. 2008-2018 Hydrographs for Yuba River and Bear River Areas ........................................ 3-31 Figure 23. 2008-2018 Hydrographs for Feather River and Honcut Creek Areas ................................ 3-32 Figure 24. Fall 2017 Conditions Compared to Fall 1991 Conditions and Long-Term Fall Conditions in the South Yuba Subbasin ...................................................................................... 3-34 List of Tables Table 1. Groundwater Substitution Transfer Pumping by Member Unit Since 2008 ........................... 3-8 Table 2. Groundwater Substitution Transfer Pumping by Pumping Zone Since 2008 ......................... 3-8 Table 3. Schedule 6, Deficiency, and Additional Pumping During 2015 ........................................... 3-10 Table 4. Additional South Yuba Subbasin Local Pumping During 2017............................................ 3-11 Table 5. Summary of Water Quality Indicators for Yuba Subbasins .................................................. 3-27 Appendices Appendix A – GMP Implementation Progress Yuba Water Agency ii August 2018 Groundwater Management Plan 2017-2018 Annual Monitoring and Measurement Report Contents List of Abbreviations and Acronyms µS/cm micro Siemens per centimeter BVID Browns Valley Irrigation District BWD Brophy Water District CID Cordua Irrigation District CASGEM California Statewide Groundwater Elevation Monitoring DCMWC Dry Creek Mutual Water Company DMS Data Management System DWR California Department of Water Resources EC electrical conductivity GAMT groundwater adaptive management tool GIS geographic information system GMP Groundwater Management Plan GSA Groundwater Sustainability Agencies GSC Groundwater Sustainability Committee GSP Groundwater Sustainability Plan GWS Groundwater Substitution Transfer MCL Maximum Contaminant Level NCRO North Central Region Office RD Reclamation District RWD Ramirez Water District SB Senate Bill SGMA Sustainable Groundwater Management Act SWN CASGEM State Water Number SYWD South Yuba Water District TDS total dissolved solids TSS Technical Support Services WWD Wheatland Water District YGM Yuba Groundwater Model Yuba Water Yuba Water Agency YWA Yuba Water Agency Yuba Water Agency iii August 2018 Groundwater Management Plan 2017-2018 Annual Monitoring and Measurement Report Contents This page left blank intentionally. Yuba Water Agency iv August 2018 Groundwater Management Plan 2017-2018 Annual Monitoring and Measurement Report Introduction 1 INTRODUCTION Yuba Water Agency (Yuba Water) adopted an updated Groundwater Management Plan (GMP) in December 2010 to build on and formalize the historically successful management of the County’s groundwater resource. Yuba Water initially developed and adopted a GMP in 2005. The updated GMP reflects conditions in the North and South Yuba groundwater subbasins through spring of 2010 and presents updated lists of basin management objectives and groundwater management actions. Locations of the North and South Yuba groundwater subbasins are shown on Figure 1. The 2010 GMP adopted seven basin management objectives: 1. Maintain groundwater elevations that provide for sustainable use of the groundwater basin. 2. Protect against potential inelastic land surface subsidence. 3. Maintain and improve groundwater quality in the Yuba basin for the benefit of groundwater users. 4. Manage groundwater to protect against adverse impacts to surface water flows. 5. Improve communication and coordination among Yuba groundwater basin stakeholders. 6. Maintain local control of the Yuba groundwater basin. 7. Improve understanding of the Yuba groundwater basin and its stressors. Further, the 2010 GMP identified specific management actions under four main GMP components: 1. Stakeholder involvement. 2. Monitoring program. 3. Groundwater resource protection. 4. Groundwater sustainability. Yuba Water publishes an Annual Monitoring and Measurement Report to document progress in implementing the GMP. The Annual Monitoring and Measurement Report is intended to be an informational document that summarizes groundwater basin conditions and management actions during the annual period covered by the Report. This document is the thirteenth Yuba Water GMP Annual Monitoring and Measurement Report, and covers the period from spring 2017 through spring 20181. The Report summarizes groundwater monitoring results collected by Yuba Water and by the California Department of Water Resources (DWR), including groundwater elevations, groundwater quality, and groundwater-surface water interaction. The Report also documents groundwater management
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