A public notice was sent to Madera County, Merced County, and City of Chowchilla on August 2, 2024 announcing the planned adoption of the Revised Chowchilla GSP by all four Chowchilla GSAs. On August 2, 2024, the Revised Chowchilla GSP had a 30-day public review period that ended on September 2, 2024. On August 16, 2024, the Chowchilla GSAs had a Revised GSP Public Workshop. On September 11, 2024, notices were also provided by Madera County and by the City of Chowchilla. The notices indicated that the County and City were each aware for more than 90 days of the Chowchilla GSAs' process of revising and resubmitting the GSP. The County and City were aware of the process for more than 90 days from the date of the notices and consulted directly and through consultants with all parties throughout the process. On January 15, 2025, the Revised Chowchilla GSP had another 30-day public review period that ended on February 15, 2025. On January 24, 2025, the Chowchilla GSAs had another Public Workshop to review revisions to the Revised Chowchilla GSP and receive input from the public.

90 Day Letter- County of Madera.pdf (197.1kB)
90 Day Letter - City Chowchilla.pdf (409.5kB)
2024 Revised GSP Notice to City Counties.pdf (222kB)

Notice announcing the planned adoption of the GSP Notice Date: 09/01/2021

The Revised GSP was adopted by the GSAs in the Chowchilla Subbasin in public hearings held on the following dates: County of Madera GSA - Chowchilla on 03/11/2025, County of Merced GSA - Chowchilla on 03/11/2025, CWD GSA on 03/12/2025, and TTWD GSA on 03/13/2025.

CWD RES GSA.2025.01_2025 GSP Revisions.pdf (1.6MB)
Madera Co The Madera Tribune_20250310_105158.pdf (658.7kB)
Merced Co Proof of Publication 02272025.pdf (109.6kB)
TTWDGSA Public Notice.pdf (566.9kB)
CWD_2024_Revised_GSP_Public_Notice.pdf (49.3kB)
Madera Co RES NO. 2025-027.pdf (605.3kB)
Merced Co Chowchilla GSP Resolution adopting 2025 GSP APPROVED 03.11.25.pdf (2MB)
TTWD_Reso 2025-01.pdf (1.4MB)

Plan Content

Groundwater Sustainability Plan (611.6MB)

Elements Guide (67.6kB)

Supporting Information

File Name	GSP Regulation Element(s)	Uploaded Date & Time

References

Title	Publication Name	Publish Date	Author(s)	File Name or URL
1995 DWR Merced County Land Use Survey		12/05/2000	California Department of Water Resources
2002 DWR Merced County Land Use Survey		04/27/2004	California Department of Water Resources
2012 DWR Merced County Land Use Survey		02/12/2018	California Department of Water Resources
1995 DWR Madera County Land Use Survey		12/05/2000	California Department of Water Resources
2001 DWR Madera County Land Use Survey		05/21/2013	California Department of Water Resources
2011 DWR Madera County Land Use Survey		01/22/2013	California Department of Water Resources
1994 DWR Fresno County Land Use Survey		12/05/2000	California Department of Water Resources
2000 DWR Fresno County Land Use Survey		02/25/2004	California Department of Water Resources
County Ag Commissioners' Data		04/01/2018	United States Department of Agriculture National Agricultural Statistics Service
Bulletin No. 74-81 - Water Well Standards	CA Department of Water Resources	12/01/1981	(DWR) CA Department of Water Resources
National Engineering Handbook: Part 630—Hydrology, Chapter 10	USDA, Natural Resources Conservation Service	01/01/2007	USDA, Natural Resources Conservation Service	file
User Manual 52: A Field Manual for Groundwater-level Monitoring at the Texas Water		01/01/2016	Hopkins, J. and B. Anderson	file
Central California Irrigation District Hazard Mitigation Grant Program DR-4308:MARPRO Red Top Joint Banking Attachment 1 - Subapplication Responses	Central California Irrigation District	01/01/2018	Castle and Cooke	file
City of Chowchilla 2040 General Plan	City of Chowchilla	01/01/2017	City of Chowchilla	file
CWD Water Management Plan, 2014 Criteria	Chowchilla Water District	04/12/2017	Chowchilla Water District	file
Accuracy of irrigation efficiency estimates.	Journal of Irrigation and Drainage Engineering	11/01/1997	Clemmens, A. J. and C. M. Burt	file
SEBAL Model with Remotely Sensed Data to Improve Water Resources Management under Actual Field Conditions	Journal of Irrigation and Drainage Engineering	02/01/2005	Bastiaanssen, W. G. M., E. J. M. Noordman, H. Pelgrum, G. Davids, B. P. Thoreson, R. G. Allen.	file
Chronological Reconstructed Sacramento and San Joaquin Valley Water Year Hydrologic Classification Indices, California Cooperative Snow Surveys.		02/22/2019	California Department of Water Resources
Chowchilla Water District-Red Top RCD Joint Powers Authority Groundwater Management Plan In accordance with AB 3030, 1997	Chowchilla Water District-Red Top RCD Joint Powers Authority	01/01/1997	Chowchilla Water District-Red Top RCD Joint Powers Authority	file
Madera County General Plan		10/24/1995	County of Madera	file
County of Madera Storm Water Resource Plan		12/28/2017	County of Madera, Fall Creek Engineering, Sierra Watershed Progressive, and 2NDNATURE	file
Ground Water in San Joaquin Valley, California	USGS Water-Supply Paper 398	01/01/1916	Mendenhall, W.C., Dole, R.B., and H. Stabler	file
Geology, Hydrology and Quality of Water in the Madera Area, San Joaquin Valley, California	USGS Open File Report 70-228	01/01/1970	Mitten, H.T., Bertoldi, G.L., and LeBlanc. R.A.	file
Groundwater Dependent Ecosystems under the Sustainable Groundwater Management Act: Guidance for Preparing Groundwater Sustainability Plans.		12/21/2018	Rohde, M. M., S. Matsumoto, J. Howard, S. Liu, L. Riege, and E. J. Remson.	file
Groundwater and stream interaction in California's Central Valley: insights for sustainable groundwater management. Prepared by RMC Water and Environment.		06/01/2014	TNC (The Nature Conservancy)	file
A practitioner’s guide to the biological condition gradient: a framework to describe incremental change in aquatic ecosystems.		02/01/2016	USEPA (U.S. Environmental Protection Agency)	file
National Wetlands Inventory website	Internet Application	12/31/2018	USFWS (U.S. Fish and Wildlife Service)
The Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board Central Valley Region, The Sacramento River Basin and the San Joaquin River Basin.		12/31/2018	CRWQCB (California Regional Water Quality Control Board)
California Protected Areas Database	Internet Application	07/01/2019	CPAD (California Protected Areas Database)
GDE pulse: taking the pulse of groundwater dependent ecosystems with satellite data	Internet Application	05/01/2019	Klausmeyer, K. R., T. Biswas, M. M. Rohde, F. Schuetzenmeister, N. Rindlaub, and J. K. Howard
Madera Regional Groundwater Management Plan, prepared for City of Chowchilla, Chowchilla Water District, City of Madera, Madera County, Madera irrigation District, and South-Est Madera County United.		12/09/2014	Provost & Pritchard, Wood Rodgers, and KDSA	file
Amendments to the Water Quality Control Plans for the Sacramento River and San Joaquin River Basins and Tulare Lake Basin to Incorporate a Central Valley-wide Salt and Nitrate Control Program		05/31/2018	Regional Water Quality Control Board (RWQCB), Central Valley Region.	file
Water Quality Control Plan for the San Francisco Bay/Sacramento-San Joaquin Delta Estuary	California Environmental Protection Agency SWRCB	05/01/1995	State Water Resources Control Board (SWRCB)	file
National Engineering Handbook: Part 630—Hydrology, Chapter 9	USDA & NRCS	01/01/2004	United States Department of Agriculture (USDA), Natural Resources Conservation Service (NRCS).	file
National Engineering Handbook: Part 630—Hydrology, Chapter 7	USDA, Natural Resources Conservation Service	01/01/2007	USDA, Natural Resources Conservation Service	file
Crop Evapotranspiration: Guidelines for computing crop water requirements.	Food and Agriculture Organization of the United Nations	01/01/1998	Allen, R. G., L. S. Pereira, D. Raes and M. Smith	file
Assessing integrity of weather data for use in reference evapotranspiration estimation.	J. Irrig. And Drain. Engrg., ASCE	02/01/1996	Allen, R. G	file
Satellite-based energy balance for mapping evapotranspiration with internalized calibration (METRIC)—Model	J. Irrig. and Drain. Engng., ASCE	08/01/2007	Allen, R. G., M. Tasumi, and R. Trezza.	file
Natural Resources Conservation Service, United States Department of Agriculture. Web Soil Survey Geographic (SSURGO) Database for Madera County, California	Online	11/29/2017	Soil Survey Staff
Region 5: Updated Groundwater Quality Analysis and High Resolution Mapping for Central Valley Salt and Nitrate Management Plan.		01/01/2017	Luhdorff and Scalmanini Consulting Engineers (LSCE) and Larry Walker Associates	file
Effects to Water Supply and Friant Operations Resulting From Plaintiffs’ Friant Release Requirements. Expert report prepared by Daniel B. Steiner for Friant Water Users Authority. 9/16/05. Cited in (Congressional Research Service, 2007).		01/01/2005	Steiner, D. B.	file
AB3030 Groundwater Management Plan, Madera County, Final Draft, prepared for County of Madera Engineering and General Services.		01/01/2002	Todd Engineers	file
1986 DWR Fresno County Land Use Survey		12/05/2000	California Department of Water Resources
2009 DWR Fresno County Land Use Survey		02/23/2011	California Department of Water Resources
Evapotranspiration Information Reporting: I. Factors Governing Measurement Accuracy	Agricultural Water Management	01/26/2011	Allen, R.G., Pereira, L.S., Howell, T.A., and Jensen, M.E.	file
Satellite-based energy balance for mapping evapotranspiration with internalized calibration (METRIC)—Applications.	Journal of Irrigation and Drainage Engineering	08/01/2007	Allen, R. G., M. Tasumi, A. Morse, R. Trezza, J. L. Wright, W. Bastiaanssen, W. Kramber, I. Lorite, and C. W. Robison	file
Design and Operation of Farm Irrigation Systems	American Society of Agricultural and Biological Engineers	08/01/2007	G. J. Hoffman, R. G. Evans, M. E. Jensen, D. L. Martin, and R. L. Elliott (eds)	file
California’s Groundwater, Bulletin 118: Update 2003	California Department of Water Resources	10/01/2003	California Department of Water Resources	file
Best Management Practices for the Sustainable Management of Groundwater: Water Budget BMP	California DWR Sustainable Groundwater Management Program	12/01/2016	California Department of Water Resources	file
Best Management Practices for Sustainable Management of Groundwater, Hydrogeologic Conceptual Model, BMP	California DWR Sustainable Groundwater Management Program	12/01/2016	California Department of Water Resources	file
Bulletin 118: California’s Groundwater, Interim Update 2016	California Department of Water Resources	12/22/2016	California Department of Water Resources	file
Best Management Practices for the Sustainable Management of Groundwater: Sustainable Management Criteria BMP (Draft)	California DWR Sustainable Groundwater Management Program	11/06/2017	California Department of Water Resources	file
Base of Fresh Ground Water (approximately 3,000 micromhos) in the San Joaquin Valley, California	USGS Hydrologic Investigations Atlas HA-489	01/01/1973	Page, R.W.	file
Changes in the Distribution of Great Valley Vernal Pool Habitats from 2005 to 2012.		10/14/2014	Witham, C. W., R. F. Holland, and J. E. Vollmar
Changes in the Distribution of Great Valley Vernal Pool Habitats from 2005 to 2012.		12/31/2014	Witham, C. W., R. F. Holland, and J. E. Vollmar
Vegetation Classification and Mapping Program	Internet Application	04/01/2019	CDFW (California Department of Fish and Wildlife)
Madera Integrated Regional Water Management Plan		02/01/2015	Provost & Pritchard	file
Comparison of Evapotranspiration Estimates from Remote Sensing (SEBAL), Water Balance, and Crop Coefficient Approaches	Proceedings of the 2009 World Environmental & Water Resources Congress American Society of Civil Engineers Environmental and Water Resources Institute	06/01/2009	Thoreson, B., B. Clark, R. Soppe, A. Keller, W. Bastiaanssen, and J. Eckhardt	file
Using reference evapotranspiration (ETo) and crop coefficients to estimate crop evapotranspiration (ETc) for agronomic crops, grasses, and vegetables, crops	University of California	01/01/1987	University of California Cooperative Extension (UCCE)	file
Explanation of the Texas Water Development Board groundwater level monitoring program and water-level measuring manual. Cited in (Hopkins and Anderson, 2016)		01/01/1994	Hopkins, J.
Technical Memorandum: Chowchilla Subbasin Sustainable Groundwater Management Act, Data Collection and Analysis, prepared for Chowchilla Subbasin Coordination Committee.		07/01/2017	Davids Engineering and Luhdorff and Scalmanini Consulting Engineers	file
San Joaquin River Restoration Study Background Report, Chapter 2: Surface Water Hydrology.		01/01/2002	Friant Water Users Authority Natural Resources Defense Council.	file
Technical Memorandum: Estimate of Future Friant Division Supplies for use in Groundwater Sustainability Plans, California.		12/28/2018	Friant Water Authority	file
Mapping indicators of groundwater dependent ecosystems in California.		04/23/2018	Klausmeyer, K., J. Howard, T. Keeler-Wolf, K. Davis-Fadtke, R. Hull, and A. Lyons	file
City of Chowchilla Sphere of Influence Expansion and Municipal Service Review. Prepared for the Madera Local Agency Formation Commission (LAFCO).		09/01/2011	Land Use Associates	file
Evaluation of Combined Rainwater and Greywater Systems for Multiple Development Types in Mediterranean climates.	Journal of Water Sustainability.	03/01/2012	Loux, J., R. Winer-Skonovd, and E. Gellerman.	file
East San Joaquin Water Quality Coalition Groundwater Quality Assessment Report		01/13/2014	Luhdorff and Scalmanini Consulting Engineers	file
Riparian Habitat Mapping, Mitigation, and Monitoring Planning Project FINAL Field Survey Report and Vegetation Map. Prepared for San Joaquin River Restoration Program under contract with the Bureau by Stillwater Sciences.	Unpublished	01/01/2014	Bureau of Reclamation	file
2030 Merced County General Plan	Merced County	12/10/2013	Merced County	file
Pacific Gas & Electric Company San Joaquin Valley operations and maintenance habitat conservation plan (includes updated Chapter 4 and Tables 5-3, 5-4 and 5-5, December 2007)	Unpublished	12/01/2006	Jones & Stokes	file
Appendix A to the Pacific Coast Salmon Fishery Management Plan, as modified by amendment 18 to the Pacific Coast Salmon Plan. Identification and description of essential fish habitat, adverse impacts, and recommended conservation measures for salmon.		01/01/2014	PFMC (Pacific Fishery Management Council).	file
Sustainable Groundwater Management Act		12/31/2014	State of California
Geology of the Fresh Ground-Water Basin of the Central Valley, California, with Texture Maps and Sections,	USGS Professional Paper 1401-C	01/01/1986	Page, R.W	file
GDE pulse. Interactive map.	Internet Application	07/01/2019	TNC (The Nature Conservancy)
Chronological Reconstructed Sacramento and San Joaquin Valley Water Year Hydrologic Classification Indices.	Internet Application	07/01/2019	California Data Exchange Center (CDEC)
Rarefind Version 5.	Internet Application	04/01/2019	CNDDB (California Natural Diversity Database)
A Manual of California Vegetation, online edition.	Internet Application	07/01/2019	CNPS (California Native Plant Society)
Framework for a Drinking Water Well Impact Mitigation Program		01/01/2020	Self-Help Enterprises (SHE), Leadership Counsel for Justice and Accountability, and Community Water Center	file
Well Completion Report (WCR) Map Application and Database		07/01/2022	DWR
Development and application of a 1D compaction model to understand 65 years of subsidence in the San Joaquin Valley	Water Resources Research	06/02/2022	Matthew Lees, Rosemary Knight, Ryan Smith	file
2014 Annual Report Mendota Pool Group Pumping and Monitoring Program		08/01/2015	Luhdorff and Scalmanini Consulting Engineers	file
Safe Drinking Water Information System (SDWIS) Drinking Water Watch: California Public Water Supply Systems		01/01/2022	State Water Resources Control Board
California Aqueduct Subsidence Study	San Luis Field Division, San Joaquin Field Division	06/01/2017	DWR	file
Groundwater Ambient Monitoring and Assessment Program (GAMA) Groundwater Information System Data Downloads		01/01/2022	State Water Resources Control Board
Interferometric Synthetic Aperture Radar (InSAR) Data		07/01/2022	DWR, TRE-ALTAMIRA
Evaluation of the Effect of Subsidence on Flow Capacity in the Chowchilla and Eastside Bypasses, and Reach 4A of the San Joaquin River	Technical Memorandum: Channel Capacity Report 2018 Restoration Year, San Joaquin River Restoration Program	05/01/2018	DWR	file
Satellite‐based ET estimation in agriculture using SEBAL and METRIC.	Hydrological Processes	11/09/2011	Allen, R., A. Irmak, R. Trezza, J. M. Hendrickx, W. Bastiaanssen, and J. Kjaersgaard	file
Evaporation, Evapotranspiration and Irrigation Water Requirements. Manual 70. Second Edition.	American Society of Civil Engineers	07/08/2016	M. E. Jensen and R. G. Allen (eds)	file
The ASCE standardized reference evapotranspiration equation	ASCE Environmental and Water Resources Institute	01/01/2005	R. G. Allen, I. A. Walter, R. L. Elliott, T. A. Howell, D. Itenfisu, M. E. Jensen, and R. L. Snyder (eds)	file
California Central Valley Unimpaired Flow Data, Fourth Edition Draft	Bay-Delta Office, California Department of Water Resources	05/01/2007	California Department of Water Resources	file
IWFM Demand Calculator: IDC-2015, revision 68. Theoretical Documentation and User’s Manual	Central Valley Modeling Unit, Modeling Support Branch, Bay-Delta Office, California Department of Water Resources	04/01/2015	California Department of Water Resources	file
Best Management Practices for Sustainable Management of Groundwater, Monitoring Networks and Identification of Data Gaps, BMP.	California DWR Sustainable Groundwater Management Program	12/01/2016	California Department of Water Resources	file
Threatened & Endangered Species Active Critical Habitat Report: online mapping tool.		05/10/2019	United States Fish and Wildlife Service
Net-zero Water Management: Achieving Energy-Positive Municipal Water Supply	Environmental Science: Water Research & Technology.	01/04/2016	Englehardt, J. D., T. Wu, F. Bloetscher, Y. Deng, P. Du Pisani, S. Eilert, S. Elmir, T. Guo, J. Jacangelo, M. LeChevallier, and H. Leverenz	file
Clayton Water District Municipal Service Review. Prepared for the Madera Local Agency Formation Commission (LAFCO).		01/01/2017	Herum Crabtree Suntag Attorneys	file
San Joaquin River Restoration Study Background Report, prepared for Friant Water Users Authority, Lindsay, CA, and Natural Resources Defense Council, San Francisco, CA.		12/01/2002	McBain and Trush Inc.	file
2017 Madera County Agricultural Crop and Livestock Report		01/01/2017	Madera County Department of Agriculture Weights and Measures	file
2017 Report On Agriculture	Merced County	01/01/2017	Merced County Department of Agriculture	file
Offsetting Water Conservation Costs to Achieve Net‐Zero Water Use.		01/01/2013	Olmos, K. C. and F. J. Loge
California Species List. Intersection of USGS Topographic Quadrangles with NOAA Fisheries ESA Listed Species, Critical Habitat, Essential Fish Habitat, and MMPA Species Data.	Internet Application	07/01/2016	NMFS (National Marine Fisheries Service)
Technical Memorandum: Madera Subbasin Sustainable Groundwater Management Act, Data Collection and Analysis, prepared for Madera Subbasin Coordination Committee		07/01/2017	Davids Engineering and Luhdorff and Scalmanini Consulting Engineers	file
eBird: An online database of bird distribution and abundance	Internet Application	05/01/2019	eBird
National Agricultural Imagery Program (NAIP), 2017 color aerial imagery.	Internet Application	12/01/2017	ESRI (Earth Systems Research Institute)
Soil Water Characteristic Estimates by Texture and Organic Matter for Hydrologic Solutions.	Soil Science Society of America Journal	01/01/2006	Saxton, K.E. & W.J. Rawls	file
DWR Technical Memorandum: Development and Calibration the California Central Valley Groundwater-Surface Water Simulation Model (C2VSim), Version 3.02-CG, Version 1.1,		03/01/2016	Brush, Charles F., Dogrul, Emin C., and Kadir, Tariq N.	file
Transition probability-based indicator geostatistics	Mathematical Geology,	04/01/1996	Carle, S. F., and Fogg, G. E.,	file
Modeling spatial variability with one- and multi-dimensional Markov chains	Mathematical Geology,	02/07/1997	Carle, S. F., and Fogg, G. E.,	file
SGMA Data Viewer	downloaded	11/29/2018	State of California
DWR Technical Memorandum: Theoretical Documentation for the Integrated Water Flow Model (IWFM-2015), Revision 828, California Department of Water Resources.	California Department of Water Resources.	01/01/2019	Dogrul, Emin C., Kadir, Tariq N., and Brush, Charles F.	file
2017. City of Chowchilla 2015 Urban Water Management Plan. March 2017.		01/01/2017	Quad Knopf, Inc.	file
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Groundwater and Wells	Johnson Screens, St. Paul, Minnesota.	01/01/1986	Driscoll, F.G.	file
Ground-water flow in the Central Valley, California,	U.S. Geological Survey Professional Paper 1401-D.	01/01/1989	Williamson, A.K., D.E. Prudic, and L.A. Swain.,	file
Statewide Crop Mapping 2014		05/08/2017	Joel Kimmelshue, Land IQ, LLC, Owner
Soil Survey Geographic (SSURGO) Database		03/31/2008	United States Department of Agriculture Natural Resources Conservation Service
San Joaquin River Restoration Settlement. Report RL34237.		01/01/2007	Congressional Research Service	file

Department of Water Resources

SGMA Portal

State Intervention GSP

5-022.05 CHOWCHILLA

Base Information

Plan Content

Supporting Information

References

Monitoring Site

SGMA Wells

Existing Sites

General Sites