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Madera Subbasin MADERA SUBBASIN Sustainable Groundwater Management Act (SGMA) First Annual Report Prepared by Davids Engineering, Inc Luhdorff & Scalmanini ERA Economics April 2020 DRAFT Madera Subbasin Sustainable Groundwater Management Act First Annual Report April 2020 Prepared For Madera Subbasin Prepared By Davids Engineering, Inc Luhdorff & Scalmanini ERA Economics Table of Contents Table of Contents ......................................................................................................................... i List of Tables ............................................................................................................................... ii List of Figures ............................................................................................................................. ii List of Appendices ..................................................................................................................... iii List of Abbreviations ................................................................................................................. iv Introduction ................................................................................................................................. 1 Executive Summary (§356.2.a) .................................................................................................. 2 Groundwater Elevations (§356.2.b.1) ........................................................................................ 6 Groundwater Level Monitoring .................................................................................................. 6 Groundwater Elevation Contour Maps (§356.2.b.1.A) .............................................................. 9 Groundwater Hydrographs (§356.2.b.1.B) .............................................................................. 10 Water Budget Approach for Quantifying Groundwater Extraction, Surface Water Supplies, and Total Water Use ................................................................................................ 10 Water Budget Structure ........................................................................................................... 11 Uncertainties in Water Budget Components ........................................................................... 13 Groundwater Extraction (§356.2.b.2) ...................................................................................... 13 Quantification and Accuracy .................................................................................................... 13 Data Sources ........................................................................................................................... 18 Groundwater Recharge ........................................................................................................... 18 Surface Water Supplies (§356.2.b.3) ....................................................................................... 20 Quantification by Water Source Type ...................................................................................... 20 Surface Water Supplies Available to Each GSA ..................................................................... 21 Data Sources ........................................................................................................................... 21 Total Water Use (§356.2.b.4) .................................................................................................... 25 Quantification by Water Use Sector and Water Source Type ................................................. 25 Data Sources ........................................................................................................................... 28 Change in Groundwater Storage (§356.2.b.5) ........................................................................ 28 Change in Groundwater Storage Maps ................................................................................... 28 Groundwater Use and Change in Groundwater Storage ........................................................ 33 Groundwater Sustainability Plan Implementation Progress (§356.2.c) ............................... 34 Implementation of Projects or Management Actions (§356.2.c) .............................................. 34 Interim Milestone Status (§356.2.c) ......................................................................................... 40 References ................................................................................................................................. 42 Madera Subbasin Joint GSP Annual Report i List of Tables Table ES-1. Coordination of Madera Subbasin Groundwater Sustainability Plans and Annual Reports. Table 1-1. Summary of Groundwater Level RMS Well Information and Measurements During Report Year (2019). Table 3-1. Groundwater Extraction Volumes and Measurement Methods by Water Use Sector, and Uncertainty (2019). Table 3-2. Joint GSP Groundwater Extractions, by Water Use Sector (acre-feet, rounded). Table 3-3. Joint GSP Groundwater Recharge (acre-feet, rounded). Table 4-1. Joint GSP Surface Water Supplies Used (Surface Water Inflows – Surface Water Outflows), by Water Source Type (acre-feet, rounded). Table 4-2. Detailed Water Budget Components and Estimation Techniques Related to Surface Water Supplies (Rivers and Streams System and Conveyance System Water Budgets). Table 5-1. Joint GSP Total Water Use, by Water Use Sector and Water Source Type (acre-feet, rounded). Table 5-2 Joint GSP Consumptive Water Use, by Water Use Sector and Water Source Type (acre-feet, rounded). Table 5-3. Madera Subbasin Weather Data Sources. Table 6-1. Calculated Change in Groundwater Storage in the Combined Upper Aquifer and Undifferentiated Unconfined Zone. Table 6-2. Calculated Change in Groundwater Storage in the Lower Aquifer Zone. Table 6-3. Total Calculated Change in Groundwater Storage in the Joint GSP Area. Table 7-1. Project and Management Action Implementation Summary. Table 7-2. Summary of RMS Well Groundwater Levels Relative to Interim Milestones, Minimum Thresholds, and Measurable Objectives. List of Figures (Figure titles that are bolded can be found at the end of the document) Figure ES-1. Map of Madera Subbasin Joint GSP GSAs. Figure 1.1. Most Recent Groundwater Level Measurement by Well. Figure 1-2. Groundwater Levels Sustainable Indicator Wells. Figure 1-3. Contours of Equal Groundwater Elevation Upper Aquifer/Undifferentiated Unconfined Zone - Spring 2019. Figure 1-4. Contours of Equal Groundwater Elevation Upper Aquifer/Undifferentiated Unconfined Zone - Fall 2019. Figure 1-5. Contours of Equal Groundwater Elevation Lower Aquifer - Spring 2019. Figure 1-6. Contours of Equal Groundwater Elevation Lower Aquifer - Fall 2019. Figure 2-1. Water Budget Accounting Structure (Source: DWR, 2016). Figure 3-1. Total Groundwater Extraction Volumes and Depth, by Joint GSP GSA. Figure 3-2. Agricultural Groundwater Extraction Volumes and Depths in Irrigated Areas, by Joint GSP GSA. Figure 6-1. Change in Groundwater Level in the Upper Aquifer/Undifferentiated Unconfined Zone - Spring 2018 through Spring 2019. Madera Subbasin Joint GSP Annual Report ii Figure 6-2. Change in Groundwater Level in the Lower Aquifer - Spring 2018 through Spring 2019. Figure 6-3. Change in Groundwater Storage in the Upper Aquifer/Undifferentiated Unconfined Zone - Spring 2018 through Spring 2019. Figure 6-4. Change in Groundwater Storage in the Lower Aquifer - Spring 2018 through Spring 2019. Figure 6-5. Annual Groundwater Storage Changes and Extractions. Figure 7-1. Fall 2019 Water Level Measurements at RMS Wells compared to 2025 Interim Milestone. Figure 7-2. Fall 2019 Water Level Measurements at RMS Wells compared to Minimum Threshold. List of Appendices Appendix A. Contour Maps of the Different Aquifer Units. Appendix B. Hydrographs of Time-Series Groundwater Level Data for Groundwater Level RMS Wells Appendix C. Maps of change in groundwater levels for each of the years between Spring 2016 and 2018, separated by principal aquifer. Maps of annual change in storage for years between Spring 2016 and Spring 2018. Appendix D. Stakeholder Communication and Engagement During Groundwater Sustainability Plan (GSP) Implementation: Recommendations. Appendix E. Madera Subbasin GSP Demand Management Plan Economic Impact Analysis Madera Subbasin Joint GSP Annual Report iii List of Abbreviations AF acre-feet ERA ERA Economics, LLC AG Agricultural Land ET evapotranspiration AGR agricultural supply ETa actual ET AN above normal ETaw ET of applied water AWMPs Agricultural Water ETc crop ET Management Plans ETo grass reference ET AWS Automatic Weather Stations ETpr ET of precipitation BMP Best Management Practice ETr alfalfa reference ET BN below normal ETref reference crop C critical evapotranspiration C2VSim California Central Valley eWRIMS Electronic Water Rights Groundwater-Surface Water Information Management Simulation Model System C2VSim-CG coarse-grid version of Flood-MAR Flood Managed Aquifer C2VSim, Version R374 Recharge C2VSim-FG fine-grid version of C2VSim FTE full-time-equivalent CCP Consensus and GAMA Groundwater Ambient Collaboration Program at Monitoring and Assessment California State University, GDEs groundwater dependent Sacramento ecosystems CCR California Code of GFWD Gravelly Ford Water District Regulations GIS geographic information CDEC California Data Exchange system Center GMP Groundwater Management cfs cubic feet per second Plan CIMIS California Irrigation GRF Gravelly Ford Management Information GSA Groundwater
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