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DWR's Basin Characterization Program

Published by California Department of Water Resources | State of California | Catalog Last Checked: June 26, 2026 at 08:24 PM | Dataset Last Updated: June 23, 2026 at 11:42 PM
DWR has a long history of studying and characterizing California’s groundwater aquifers as a part of [California’s Groundwater (Bulletin 118)](https://water.ca.gov/Programs/Groundwater-Management/Bulletin-118 "California’s Groundwater (Bulletin 118)"). [California's Groundwater Basin Characterization Program](https://water.ca.gov/Programs/Groundwater-Management/Bulletin-118/Basin-Characterization "California's Groundwater Basin Characterization Program") provides the latest data and information about California’s groundwater basins to help local communities better understand their aquifer systems and support local and statewide groundwater management. Under the Basin Characterization Program, new and existing data (AEM, lithology logs, geophysical logs, etc.) are integrated to create continuous maps and three-dimensional models. To support this effort, new data analysis tools have been developed to create texture models, hydrostratigraphic models, and aquifer flow parameters. Data collection efforts have been expanded to include advanced geologic, hydrogeologic, and geophysical data collection and data digitization and quality control efforts will continue. To continue to support data access and data equity, the Basin Characterization Program has developed new online, GIS-based, visualization tools to serve as a central hub for accessing and exploring groundwater related data in California. More information is available on the [Basin Characterization Program webpage](https://water.ca.gov/Programs/Groundwater-Management/Bulletin-118/Basin-Characterization "Basin Characterization Program webpage"). --- # [Maps and Models](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/6b4823ed-e1e6-4a91-b1c6-f88423962f90 "Maps and Models") Integrated datasets are used to develop state‑stewarded maps and 3D models describing aquifer structure, sediment textures, hydrostratigraphy, and groundwater‑flow properties. Products are updated as new data become available. - Texture Models - Hydrostratigraphic Models - Aquifer Recharge Potential Maps - Extent of Corcoran Clay - Base of Freshwater --- # Groundwater Basin Investigations # DWR conducts investigations at multiple scales to develop state‑stewarded maps and models of California’s groundwater basins. ##Local Investigations + [Madera & North Kings](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/8400c923-e18d-4ac5-958b-82f88e5af4f8 "Madera & North Kings"): AEM and tTEM data collection, lithology log digitization, texture model development, aquifer recharge potential mapping analysis. + [Pajaro](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/043aaa87-5c5d-433e-9afe-80f6966ca3ad "Pajaro"): AEM and tTEM data collection + [Western San Joaquin Valley](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/c2633b9c-cd34-445b-ac2d-4a5b49eb881d "Western San Joaquin Valley"): AEM data collection, lithology and geophysical log data digitization, texture model development. + [Prospect Island](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/b96e8832-d8af-416e-abcd-9240f7fb33d4 "Prospect Island"): AEM data collection, FloaTEM data collection test. ##Regional Investigations + [Sacramento Valley](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/fed9f9dd-fd0d-4ef6-a21b-a8835404b3c6 "Sacramento Valley"): AEM data collection, texture model development, aquifer recharge potential mapping analysis. + [Four County Area of San Joaquin Valley (Madera, Fresno, Kings, and Tulare counties) ](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/a19efaf7-c0c0-4816-bcdc-1c1010a38ab3 "Four County Area of San Joaquin Valley (Madera, Fresno, Kings, and Tulare counties) "): AEM data collection, data digitization, texture model development, hydrogeologic conceptual model development, clay delineation, subsidence potential and mitigation, and aquifer recharge potential mapping analysis. + [San Joaquin Valley](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/19ea1234-6545-41c9-aeb2-f655d6599286 "San Joaquin Valley"): AEM data collection, data digitization, texture model development, hydrogeologic conceptual model development, clay delineation, subsidence potential and mitigation, and aquifer recharge potential mapping analysis. ##Statewide Investigations + [Statewide AEM Surveys](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/c9297796-80fb-4a0c-9464-5ec7a12c24bf "Statewide AEM Surveys"): AEM data collection, geophysical and lithology log data digitization. --- # Data Collection & Digitization # ## [Collected Geophysical Data](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/32347fa2-cadb-4994-88aa-6e9a87914c4e "Collected Geophysical Data") Methods include: - Airborne electromagnetics (AEM) - tTEM (towed TEM) - FloaTEM (water‑borne TEM) - Borehole geophysical logging ## [Digitized Lithology and Geophysical Logs](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/942aa75e-8727-4e12-84a6-280b5896f3b0 "Digitized Lithology and Geophysical Logs") Digitized logs support regional and statewide interpretations and are integrated into OSWCR. --- #Analysis Tools and Process Documents Tools and guidance documents support integration and analysis of geologic, geophysical, and hydrogeologic datasets. ##[BCTools](https://data.cnra.ca.gov/dataset/dwr-basin-characterization-bctools ""BCTools") Open‑source tools for hydrostratigraphic modeling, sediment‑texture modeling, and aquifer‑parameter estimation. ##[Aquifer Recharge Potential Mapping](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/7d33d618-38bc-4511-834c-6e791695f8e2 "Aquifer Recharge Potential Mapping") Methodology for identifying locations that have relatively higher potential for managed aquifer recharge. --- # Data Visualization # ##[SGMA Data Viewer: Basin Characterization tab](https://sgma.water.ca.gov/webgis/?appid=SGMADataViewer#basincharacter "SGMA Data Viewer: Basin Characterization tab") Provides maps, profiles, and depth slices of: - Recharge potential - Texture model depth slices - Statewide AEM datasets - Lithology and geophysical log locations - AEM profiles ##[California's Groundwater Subsurface Viewer](https://sgma.water.ca.gov/subsurfaceviewer "California's Groundwater Subsurface Viewer") Interactive 2D/3D views of AEM resistivity, coarse‑fraction data, lithology logs, and related datasets. Demo videos: + [Demo - AEM Data](https://cadwr.box.com/s/n0r66gkq4zoso0n9i6vb2o42uzcoq17s "Demo - AEM Data") + [Demo - tTEM data](https://cadwr.box.com/s/a1mlh8wh2dagya4uahlxsbm9b79x44lp "Demo - tTEM data") --- # Relevant Publications # + California Department of Water Resources, 2025, [California’s Groundwater: Bulletin 118 – Update 2025](https://data.cnra.ca.gov/dataset/calgw_update2025 "California’s Groundwater: Bulletin 118 – Update 2025"), Chapter 3: Natural and Built Groundwater Infrastructure. + Dlubac, K., Springhorn, S., Brezing, B., Altare, C., and T. Godwin, 2024, [California's Statewide Airborne Electromagnetic Surveys and Preliminary Hydrogeologic Interpretations](https://www.conservation.ca.gov/cgs/documents/publications/california-geology-magazine/CG_2024-AEMsurveys.pdf "California's Statewide Airborne Electromagnetic Surveys and Preliminary Hydrogeologic Interpretations"), California's Geology Magazine, pp. 18-31. --- # Presentation Recordings Selected presentation recordings on Basin Characterization Program efforts. + [BCTools Overview](https://cadwr.box.com/s/utu3si1lyyfg9ywbi8c92etp7kl4kaib "BCTools Overview"), Basin Characterization Team, Jack Baer, Woodard and Curran, Vivek Bedekar, SSPA, *Basin Characterization Exchange*, June2026 + [Basin Characterization Program Overview](https://cadwr.box.com/s/ygobghqthe2i98lultjdzqvk3y74f7dp "Basin Characterization Program Overview"), Steven Springhorn and Katherine Dlubac, DWR, *Basin Characterization Exchange*, March 2026 + [Aquifer Recharge Potential Mapping](https://cadwr.box.com/s/1okat2cbl3h75hm1nxtvpjmje2llg95t "Aquifer Recharge Potential Mapping"), Basin Characterization Team, Mesut Cayar, Woodard and Curran, *Basin Characterization Exchange*, April 2025 + [California's Groundwater Bulletin 118 - Update 2025](https://cadwr.box.com/s/wvglzpa4l7nye0f21n03nvzujazs887t "California's Groundwater Bulletin 118 - Update 2025"), Emilia Wisniewski, Mandy Ott, Katherine Dlubac, DWR, *Basin Characterization Exchange*, November 2025 --- # Basin Characterization Exchange # The Basin Characterization Exchange (BCX) is a meeting series and network space for the Basin Characterization community to exchange ideas, share lessons learned, define needed guidance, and highlight research topics. Meetings are generally held the third Tuesday of each month, 12:30–1:30 pm (PST). + [Join the BCX listserv](https://forms.office.com/g/VgNif0iEuE "Join the BCX listserv") - Visit the [BCX Hub](https://cadwr.box.com/v/BasinCharacterizationExchange "BCX Hub") for schedules and materials

Resources

29 resources available

  • Presentation - Basin Characterization Program Overview

    FILE
    Visit Page

  • Statewide AEM Surveys

    FILE
    Visit Page

  • Sacramento Valley - Aquifer Recharge Potential Maps (Version 2025.1)

    FILE
    Visit Page

  • Aquifer Recharge Potential Mapping Process Document (Version 2025.2 - Draft)

    PDF
    Download

  • Prospect Island - FloaTEM Test Technical Memo (Draft) Appendices

    ZIP
    Download

  • Madera & North Kings - Aquifer Recharge Potential Maps (Version 2024.3)

    FILE GEODATABASE
    Download

  • Pajaro - tTEM Data Report (Draft) Appendices

    ZIP
    Download

  • Madera & North Kings - tTEM Data Report (Draft) Appendices

    ZIP
    Download

  • Madera & North Kings - tTEM Data Report (Draft)

    PDF
    Download

  • Pajaro - tTEM Data Report (Draft)

    PDF
    Download

  • Pajaro - tTEM Data Report Addendum (Draft)

    PDF
    Download

  • Analysis Tool - Data2Texture

    PDF
    Download

  • Four County Area- Digitized lithology and geophysical logs

    ZIP
    Download

  • Kern County - Digitized lithology and geophysical logs

    ZIP
    Download

  • Madera & North Kings - Digitized lithology and geophysical logs

    .ZIP
    Download

  • Sacramento Valley - Digitized lithology and geophysical logs

    ZIP
    Download

  • South Kings Area - Digitized lithology and geophysical logs

    ZIP
    Download

  • Western San Joaquin Valley - Digitized lithology and geophysical logs

    ZIP
    Download

  • San Joaquin Valley (other) - Digitized lithology and geophysical logs

    ZIP
    Download

  • Prospect Island - FloaTEM Test Data (Preliminary)

    ZIP
    Download

  • Madera & North Kings - tTEM Data (Preliminary)

    ZIP
    Download

  • Pajaro - tTEM Data (Preliminary)

    ZIP
    Download

  • Analysis Tool - Data2HSM via Smart Interpretation

    PDF
    Download

  • Prospect Island - FloaTEM Test Technical Memo (Draft)

    PDF
    Download

  • Sacramento Valley - Texture Model Version 2025.1

    ZIP
    Download

  • Madera & North Kings - Texture Model Version 2024.3

    ZIP
    Download

  • Analysis Tool - Texture2Par V2

    PDF
    Download

  • Analysis Tool - Data2HSM via Gaussian Mixture Model

    PDF
    Download

  • Analysis Tool - Data2HSM via GeoPDNN

    PDF
    Download

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Complete Metadata
@type dcat:Dataset
accessLevel public
contactPoint 
{
  "fn": "Katherine Dlubac",
  "@type": "vcard:Contact",
  "hasEmail": "mailto:katherine.dlubac@water.ca.gov"
}
description DWR has a long history of studying and characterizing California’s groundwater aquifers as a part of [California’s Groundwater (Bulletin 118)](https://water.ca.gov/Programs/Groundwater-Management/Bulletin-118 "California’s Groundwater (Bulletin 118)"). [California's Groundwater Basin Characterization Program](https://water.ca.gov/Programs/Groundwater-Management/Bulletin-118/Basin-Characterization "California's Groundwater Basin Characterization Program") provides the latest data and information about California’s groundwater basins to help local communities better understand their aquifer systems and support local and statewide groundwater management. Under the Basin Characterization Program, new and existing data (AEM, lithology logs, geophysical logs, etc.) are integrated to create continuous maps and three-dimensional models. To support this effort, new data analysis tools have been developed to create texture models, hydrostratigraphic models, and aquifer flow parameters. Data collection efforts have been expanded to include advanced geologic, hydrogeologic, and geophysical data collection and data digitization and quality control efforts will continue. To continue to support data access and data equity, the Basin Characterization Program has developed new online, GIS-based, visualization tools to serve as a central hub for accessing and exploring groundwater related data in California. More information is available on the [Basin Characterization Program webpage](https://water.ca.gov/Programs/Groundwater-Management/Bulletin-118/Basin-Characterization "Basin Characterization Program webpage"). --- # [Maps and Models](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/6b4823ed-e1e6-4a91-b1c6-f88423962f90 "Maps and Models") Integrated datasets are used to develop state‑stewarded maps and 3D models describing aquifer structure, sediment textures, hydrostratigraphy, and groundwater‑flow properties. Products are updated as new data become available. - Texture Models - Hydrostratigraphic Models - Aquifer Recharge Potential Maps - Extent of Corcoran Clay - Base of Freshwater --- # Groundwater Basin Investigations # DWR conducts investigations at multiple scales to develop state‑stewarded maps and models of California’s groundwater basins. ##Local Investigations + [Madera & North Kings](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/8400c923-e18d-4ac5-958b-82f88e5af4f8 "Madera & North Kings"): AEM and tTEM data collection, lithology log digitization, texture model development, aquifer recharge potential mapping analysis. + [Pajaro](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/043aaa87-5c5d-433e-9afe-80f6966ca3ad "Pajaro"): AEM and tTEM data collection + [Western San Joaquin Valley](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/c2633b9c-cd34-445b-ac2d-4a5b49eb881d "Western San Joaquin Valley"): AEM data collection, lithology and geophysical log data digitization, texture model development. + [Prospect Island](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/b96e8832-d8af-416e-abcd-9240f7fb33d4 "Prospect Island"): AEM data collection, FloaTEM data collection test. ##Regional Investigations + [Sacramento Valley](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/fed9f9dd-fd0d-4ef6-a21b-a8835404b3c6 "Sacramento Valley"): AEM data collection, texture model development, aquifer recharge potential mapping analysis. + [Four County Area of San Joaquin Valley (Madera, Fresno, Kings, and Tulare counties) ](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/a19efaf7-c0c0-4816-bcdc-1c1010a38ab3 "Four County Area of San Joaquin Valley (Madera, Fresno, Kings, and Tulare counties) "): AEM data collection, data digitization, texture model development, hydrogeologic conceptual model development, clay delineation, subsidence potential and mitigation, and aquifer recharge potential mapping analysis. + [San Joaquin Valley](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/19ea1234-6545-41c9-aeb2-f655d6599286 "San Joaquin Valley"): AEM data collection, data digitization, texture model development, hydrogeologic conceptual model development, clay delineation, subsidence potential and mitigation, and aquifer recharge potential mapping analysis. ##Statewide Investigations + [Statewide AEM Surveys](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/c9297796-80fb-4a0c-9464-5ec7a12c24bf "Statewide AEM Surveys"): AEM data collection, geophysical and lithology log data digitization. --- # Data Collection & Digitization # ## [Collected Geophysical Data](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/32347fa2-cadb-4994-88aa-6e9a87914c4e "Collected Geophysical Data") Methods include: - Airborne electromagnetics (AEM) - tTEM (towed TEM) - FloaTEM (water‑borne TEM) - Borehole geophysical logging ## [Digitized Lithology and Geophysical Logs](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/942aa75e-8727-4e12-84a6-280b5896f3b0 "Digitized Lithology and Geophysical Logs") Digitized logs support regional and statewide interpretations and are integrated into OSWCR. --- #Analysis Tools and Process Documents Tools and guidance documents support integration and analysis of geologic, geophysical, and hydrogeologic datasets. ##[BCTools](https://data.cnra.ca.gov/dataset/dwr-basin-characterization-bctools ""BCTools") Open‑source tools for hydrostratigraphic modeling, sediment‑texture modeling, and aquifer‑parameter estimation. ##[Aquifer Recharge Potential Mapping](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/7d33d618-38bc-4511-834c-6e791695f8e2 "Aquifer Recharge Potential Mapping") Methodology for identifying locations that have relatively higher potential for managed aquifer recharge. --- # Data Visualization # ##[SGMA Data Viewer: Basin Characterization tab](https://sgma.water.ca.gov/webgis/?appid=SGMADataViewer#basincharacter "SGMA Data Viewer: Basin Characterization tab") Provides maps, profiles, and depth slices of: - Recharge potential - Texture model depth slices - Statewide AEM datasets - Lithology and geophysical log locations - AEM profiles ##[California's Groundwater Subsurface Viewer](https://sgma.water.ca.gov/subsurfaceviewer "California's Groundwater Subsurface Viewer") Interactive 2D/3D views of AEM resistivity, coarse‑fraction data, lithology logs, and related datasets. Demo videos: + [Demo - AEM Data](https://cadwr.box.com/s/n0r66gkq4zoso0n9i6vb2o42uzcoq17s "Demo - AEM Data") + [Demo - tTEM data](https://cadwr.box.com/s/a1mlh8wh2dagya4uahlxsbm9b79x44lp "Demo - tTEM data") --- # Relevant Publications # + California Department of Water Resources, 2025, [California’s Groundwater: Bulletin 118 – Update 2025](https://data.cnra.ca.gov/dataset/calgw_update2025 "California’s Groundwater: Bulletin 118 – Update 2025"), Chapter 3: Natural and Built Groundwater Infrastructure. + Dlubac, K., Springhorn, S., Brezing, B., Altare, C., and T. Godwin, 2024, [California's Statewide Airborne Electromagnetic Surveys and Preliminary Hydrogeologic Interpretations](https://www.conservation.ca.gov/cgs/documents/publications/california-geology-magazine/CG_2024-AEMsurveys.pdf "California's Statewide Airborne Electromagnetic Surveys and Preliminary Hydrogeologic Interpretations"), California's Geology Magazine, pp. 18-31. --- # Presentation Recordings Selected presentation recordings on Basin Characterization Program efforts. + [BCTools Overview](https://cadwr.box.com/s/utu3si1lyyfg9ywbi8c92etp7kl4kaib "BCTools Overview"), Basin Characterization Team, Jack Baer, Woodard and Curran, Vivek Bedekar, SSPA, *Basin Characterization Exchange*, June2026 + [Basin Characterization Program Overview](https://cadwr.box.com/s/ygobghqthe2i98lultjdzqvk3y74f7dp "Basin Characterization Program Overview"), Steven Springhorn and Katherine Dlubac, DWR, *Basin Characterization Exchange*, March 2026 + [Aquifer Recharge Potential Mapping](https://cadwr.box.com/s/1okat2cbl3h75hm1nxtvpjmje2llg95t "Aquifer Recharge Potential Mapping"), Basin Characterization Team, Mesut Cayar, Woodard and Curran, *Basin Characterization Exchange*, April 2025 + [California's Groundwater Bulletin 118 - Update 2025](https://cadwr.box.com/s/wvglzpa4l7nye0f21n03nvzujazs887t "California's Groundwater Bulletin 118 - Update 2025"), Emilia Wisniewski, Mandy Ott, Katherine Dlubac, DWR, *Basin Characterization Exchange*, November 2025 --- # Basin Characterization Exchange # The Basin Characterization Exchange (BCX) is a meeting series and network space for the Basin Characterization community to exchange ideas, share lessons learned, define needed guidance, and highlight research topics. Meetings are generally held the third Tuesday of each month, 12:30–1:30 pm (PST). + [Join the BCX listserv](https://forms.office.com/g/VgNif0iEuE "Join the BCX listserv") - Visit the [BCX Hub](https://cadwr.box.com/v/BasinCharacterizationExchange "BCX Hub") for schedules and materials
distribution 
[
  {
    "@type": "dcat:Distribution",
    "title": "Presentation - Basin Characterization Program Overview",
    "accessURL": "https://cadwr.box.com/s/oz4s9p1zogov853x93wtd20zfz1ojuym",
    "description": "Presented by Steven Springhorn and Katherine Dlubac during the March 2026 Basin Characterization Exchange."
  },
  {
    "@type": "dcat:Distribution",
    "title": "Statewide AEM Surveys",
    "accessURL": "https://data.cnra.ca.gov/dataset/aem",
    "description": "## Datasets and Reports 
All AEM data and reports are available on the CNRA Open Data Portal page: https://data.cnra.ca.gov/dataset/aem

## AEM Flight Line Map
A map displaying the location of AEM data collection can be found here: https://data.cnra.ca.gov/dataset/aem/resource/8a020073-20e4-4feb-9271-fe8f76c99a85

## AEM Data Viewers
DWR's AEM 3D and Profile Viewers can be accessed here: https://data.cnra.ca.gov/dataset/aem/resource/29c4478d-fc34-44ab-a373-7d484afa38e8"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Sacramento Valley - Aquifer Recharge Potential Maps (Version 2025.1)",
    "accessURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/6eea2799-5b67-4cfb-925b-c30c2098429e/download/sacvalley_arp_2025.1.zip",
    "description": "Aquifer Recharge Potential (ARP) map V.2025.3 for the Sacramento Valley Regional Investigation.

ARP maps were developed using the [Sacramento Valley - Texture Model (Version 2025.1)](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/087e6e7c-56cd-443f-a7e4-868428e94d1f "Sacramento Valley - Texture Model (Version 2025.1)")

Additional information on the ARP mapping process can be found on the [Aquifer Recharge Potential Mapping Process Document](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/7d33d618-38bc-4511-834c-6e791695f8e2 "Aquifer Recharge Potential Mapping Process Document").


File updated on 8/14/2025."
  },
  {
    "@type": "dcat:Distribution",
    "title": "Aquifer Recharge Potential Mapping Process Document (Version 2025.2 - Draft)",
    "format": "PDF",
    "mediaType": "application/pdf",
    "description": "###Description
The Aquifer Recharge Potential (ARP) Process Document describes the datasets and analyses used to create ARP maps. ARP maps identify locations that have relatively higher potential for managed aquifer recharge (MAR) and are intended to be used as a screening tool. 

###Version 2025.2

Publication Date: 10/24/2025 

### Version History
Version 2025.2 (Released October 2025): Revised approach for incorporating modified and unmodified SAGBI into the soil conditions sub-indices.</li>
Addition of the Shallow (Built) Aquifer Recharge Potential map type.

Version 2024.1 (Released October 2024) 

###Process Document and Use Disclaimer 
DWR makes no warranties, representations, or guarantees, either expressed or implied, as to the accuracy, completeness, or correctness of the analytical process provided in this Process Document or related nor accepts or assumes any liability arising from the use of the Process Document. Neither the Department nor any of the data sources, datasets, or maps shall be responsible for any errors or omissions, or for the use or results obtained from using this information. A Groundwater Sustainability Agency is not required to use this Process Document, and its use does not guarantee the adequacy of a Groundwater Sustainability Plan that relies on such analytical processes.",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/7d33d618-38bc-4511-834c-6e791695f8e2/download/aquifer-recharge-potential-process-document-v2025.2b.pdf"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Prospect Island - FloaTEM Test Technical Memo (Draft) Appendices",
    "format": "ZIP",
    "mediaType": "application/zip",
    "description": "Appendices for Prospect Island - FloaTEM Test Technical Memo (Draft).

File updated on 8/14/2025.",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/7f54ef5a-a4cd-4fb8-93c1-16e8d031bccf/download/prospectisland_floatem_test_appendices.zip"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Madera & North Kings - Aquifer Recharge Potential Maps (Version 2024.3)",
    "format": "file geodatabase",
    "mediaType": "application/octet-stream",
    "description": "Aquifer Recharge Potential (ARP) map V.2024.3 for the Madera & North Kings Local Investigation. 

ARP maps were developed using the [Local Investigation: Madera/North Kings - Texture model (Version 2024.3)](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/ddd6d0d5-68e7-45c1-b9b1-d88de3cf1276 "Local Investigation: Madera/North Kings - Texture model (Version 2024.3)")

Additional information on the ARP mapping process can be found on the [Aquifer Recharge Potential Mapping Process Document](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/7d33d618-38bc-4511-834c-6e791695f8e2 "Aquifer Recharge Potential Mapping Process Document").

File updated on 12/19/2024.
***


Superseded Data Releases:

*  Aquifer Recharge Potential Maps (Version 2024.2)

Email Basin.Characterization@water.ca.gov to request a superseded dataset.
***",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/e5c9e782-bb75-495b-bb22-b659976937ae/download/maderankings_arp_2024.3.zip"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Pajaro - tTEM Data Report (Draft) Appendices",
    "format": "ZIP",
    "mediaType": "application/zip",
    "description": "Data Report (Draft) Appendices for the tTEM data collected for the Pajaro Local Investigation.

File updated on 12/4/2024.",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/4b6e3e2b-9b59-4e3a-a000-0d65dd9be2a6/download/li_pajaro_ttem_report_appendices_20241204.zip"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Madera & North Kings - tTEM Data Report (Draft) Appendices",
    "format": "ZIP",
    "mediaType": "application/zip",
    "description": "Data Report (Draft) Appendices for the tTEM data collected for the Pajaro Local Investigation.

File updated on 6/17/2026.",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/2927e01f-107d-417e-8a19-5c91211819ed/download/madera_nkings_ttem_appendices.zip"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Madera & North Kings - tTEM Data Report (Draft)",
    "format": "PDF",
    "mediaType": "application/pdf",
    "description": "Data Report (draft) for the tTEM data collected for the Madera and North Kings Local Investigation. The Draft Data Report contains information about data collection and the process to invert for the data for electrical resistivity values vs depth. Data Report to be updated with interpretations of electrical resistivity to texture (as percent coarse-grained material).

File updated on 6/17/2026.",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/ad02fdfe-65c9-40c1-8157-a883bea3de70/download/20260521_dwr_ttem_madera_north_kings_report.pdf"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Pajaro - tTEM Data Report (Draft)",
    "format": "PDF",
    "mediaType": "application/pdf",
    "description": "Data Report (draft) for the tTEM data collected for the Pajaro Local Investigation. The Draft Data Report contains information about data collection and the process to invert for the data for electrical resistivity values vs depth. Data Report to be updated with interpretations of electrical resistivity to texture (as percent coarse-grained material).  

File updated on 12/4/2024.",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/5e3dd3d1-a295-433c-b67b-6f1f8a88dab2/download/ttem_report_final.pdf"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Pajaro - tTEM Data Report Addendum (Draft)",
    "format": "PDF",
    "mediaType": "application/pdf",
    "description": "Data Report Addendum (draft) for the tTEM data collected for the Pajaro Local Investigation. The Data Report Addendum includes the process and interpretations of electrical resistivity for texture (as percent coarse-grained material).

See [Pajaro - tTEM Data Report](https://data.cnra.ca.gov/dataset/dwr-basin-characterization/resource/5e3dd3d1-a295-433c-b67b-6f1f8a88dab2 "Pajaro - tTEM Data Report ") for tTEM survey area information and electrical resistivity profiles. 



File updated 3/20/2025.",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/a1430fe6-3962-4c8f-986b-30694955146a/download/pajarottem_report_addendum.pdf"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Analysis Tool - Data2Texture",
    "format": "PDF",
    "mediaType": "application/pdf",
    "description": "Data2Texture is an advanced spatial data interpolation and simulation tool for estimating the distribution of sediment textures from AEM. borehole lithology, and geophysical logging data.",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/91b11192-9867-4020-82f0-df795d6eb7b4/download/bc_analysistools_data2texture_20241003.pdf"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Four County Area- Digitized lithology and geophysical logs",
    "format": "ZIP",
    "mediaType": "application/zip",
    "description": "Digitized lithology and geophysical logging data for the Four County Area Regional Investigation (covering Madera, Fresno, Kings, and Tulare counties). 

File updated 1/13/2026.",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/41ec1f67-cb0c-4d13-9d81-e514cdb1f880/download/four_counties_20251219.zip"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Kern County - Digitized lithology and geophysical logs",
    "format": "ZIP",
    "mediaType": "application/zip",
    "description": "Digitized lithology and geophysical logging data for the Kern County portion of the San Joaquin Valley Regional Investigation.

File updated 1/13/2026.",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/d0f5505f-d634-423e-9329-7d553030aff8/download/kern_county_20251219.zip"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Madera & North Kings - Digitized lithology and geophysical logs",
    "format": ".zip",
    "mediaType": "application/octet-stream",
    "description": "Digitized lithology and geophysical logging data for the Madera & North Kings Local Investigation. 

File updated 1/13/2026.",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/1d08d5ff-427d-4d77-9d39-89caca3c34fe/download/madera_northkings_20251219.zip"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Sacramento Valley - Digitized lithology and geophysical logs",
    "format": "ZIP",
    "mediaType": "application/zip",
    "description": "Digitized lithology and geophysical logging data for the Sacramento Valley Regional Investigation.

File updated 6/11/2026.",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/9d54f983-9cb8-4bb9-a728-791a5160554c/download/sacremento_valley.zip"
  },
  {
    "@type": "dcat:Distribution",
    "title": "South Kings Area - Digitized lithology and geophysical logs",
    "format": "ZIP",
    "mediaType": "application/zip",
    "description": "Digitized lithology and geophysical logging data for the South Kings Groundwater Basin area.

File updated 2/2/2026.",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/2a57bd1f-8adf-4dce-88a9-9627f0cc343c/download/south_kings_20260123.zip"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Western San Joaquin Valley - Digitized lithology and geophysical logs",
    "format": "ZIP",
    "mediaType": "application/zip",
    "description": "Digitized lithology and geophysical logging data for the Western San Joaquin Valley Local Investigation.

File updated 1/13/2026.",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/8757704f-6f98-484d-bd4c-eb2fa08ac080/download/westernsjv_20251219.zip"
  },
  {
    "@type": "dcat:Distribution",
    "title": "San Joaquin Valley (other) - Digitized lithology and geophysical logs",
    "format": "ZIP",
    "mediaType": "application/zip",
    "description": "Digitized lithology and geophysical logging data for the areas outside of the Madera/North Kings, Western San Joaquin Valley, and Four County Investigation areas.

File updated 1/13/2026.",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/8fffe374-d89f-4c40-b115-307e8752c537/download/sjv_other_20251219.zip"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Prospect Island - FloaTEM Test Data (Preliminary)",
    "format": "ZIP",
    "mediaType": "application/zip",
    "description": "Preliminary FloaTEM test data collected as a part of the Prospect Island Local Investigation. Dataset includes electrical resistivity data.

File updated on 8/14/2025.",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/b9c3959d-8c37-4f1c-ac87-647ae803f3be/download/prospectisland_floatem_data.zip"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Madera & North Kings - tTEM Data (Preliminary)",
    "format": "ZIP",
    "mediaType": "application/zip",
    "description": "Preliminary tTEM data collected in the Madera & North Kings Local Investigation. Dataset includes electrical resistivity values and 3D interpolations of electrical resistivity. Data interpretations coming soon. 

File updated on 6/23/2026.",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/4a9bdd40-025f-4c5d-b802-9a9a684eb9cd/download/madera_nkings_ttem_data_20260623.zip"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Pajaro - tTEM Data (Preliminary)",
    "format": "ZIP",
    "mediaType": "application/zip",
    "description": "Preliminary tTEM data collected in the Pajaro area. Dataset includes electrical resistivity data and interpretations for texture. 

File updated on 3/20/2025.",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/65115263-5b72-41b8-b2c4-f471b10e8c4e/download/pajaro_ttem_20250320.zip"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Analysis Tool - Data2HSM via Smart Interpretation",
    "format": "PDF",
    "mediaType": "application/pdf",
    "description": "Smart Interpretation (SI) is a semi-automatic Python tool for delineating continuous hydrogeologic surfaces from airborne electromagnetic data products, including inverse resistivity and coarse-fraction models. 

File contains a preliminary description of the Data2HSM via Smart Interpretation tool. Tool expected to be publicly available in Early 2025.",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/a00585a3-d330-41b1-aeba-f450526596b9/download/bc_analysistools_data2hsm_si_20241003.pdf"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Prospect Island - FloaTEM Test Technical Memo (Draft)",
    "format": "PDF",
    "mediaType": "application/pdf",
    "description": "Technical Memo (draft) for the FloaTEM test data collection effort performed at Prospect Island. The Technical Memo contains information about data collection and the process to invert for the data for electrical resistivity values vs depth, a preliminary interpretation of the data, and a comparison to existing tTEM and AEM data.

File updated on 8/14/2025.",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/9a415521-f49a-44af-9ec3-1250bf0a4dab/download/prospect_island_floatem_techmemo_final.pdf"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Sacramento Valley - Texture Model Version 2025.1",
    "format": "ZIP",
    "mediaType": "application/zip",
    "description": "Texture Model Version 2025.1 for the Sacramento Valley Investigation.

Texture Model Version 2025.1 was developed using Data2Texture and includes the integration of digitized lithology logs from SVSim. Data2Texture model files available upon request. 

File updated on 6/11/2025",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/087e6e7c-56cd-443f-a7e4-868428e94d1f/download/sacvalley_texturemodel_v2025.1.zip"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Madera & North Kings - Texture Model Version 2024.3",
    "format": "ZIP",
    "mediaType": "application/zip",
    "description": "Texture model Version 2024.3 for the Madera & North Kings Local Investigation.

Model was developed using [Data2Texture](Data2Texture, Data2HSM, and Texture2Par V.2 "Data2Texture") and includes the integration of texture derived from available AEM data and digitized lithology logs. 

File updated on 12/19/2024
***
Superseded Data Releases::

* Texture Model Version 2024.2

Email Basin.Characterization@water.ca.gov to request a superseded dataset.",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/ddd6d0d5-68e7-45c1-b9b1-d88de3cf1276/download/maderanorthkings_texture_2024.3.zip"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Analysis Tool - Texture2Par V2",
    "format": "PDF",
    "mediaType": "application/pdf",
    "description": "Texture2Par Version 2 is a groundwater model pre-processor and parameterization utility tool developed to work with the IWFM and MODFLOW families of hydrologic simulation codes. Texture2Par Version 2 allows for the integration of AEM data into the groundwater flow model parameterization process. Version 2 builds off of [Texture2Par Version 1](https://data.cnra.ca.gov/dataset/svsim/resource/88cbfa06-a2e7-4078-8f76-a1044d32fe70 "Texture2Par Version 1"), utilized in [DWR's Sacramento Valley Groundwater-Surface Water Simulation Model](https://data.cnra.ca.gov/dataset/svsim "DWR's Sacramento Valley Groundwater-Surface Water Simulation Model").  

File contains a preliminary description of the Texture2Par Version 2.0 tool. Tool expected to be publicly available in Early 2025.",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/ef60d3ee-91d3-40cc-9455-5b9775993ee5/download/bc_analysistools_texture2parv2_20241003.pdf"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Analysis Tool - Data2HSM via Gaussian Mixture Model",
    "format": "PDF",
    "mediaType": "application/pdf",
    "description": "The Data2HSM via Gaussian Mixture Model tool ingests the AEM data and groups the data into a user-specified number of clusters that are interpreted as stratigraphic units in the hydrostratigraphic model (HSM). 

File contains a preliminary description of the Data2HSM via Gaussian Mixture Model tool. Tool expected to be publicly available in Early/Mid 2025.",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/14a82d4c-c6f7-4d13-8189-91cada79f867/download/bc_analysistools_data2hsm_gmm_20241003.pdf"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Analysis Tool - Data2HSM via GeoPDNN",
    "format": "PDF",
    "mediaType": "application/pdf",
    "description": "The GeoPDNN (Geological Pseudolabel Deep Neural Network) is a semi-supervised machine learning tool that integrates point-based datasets - such as formation picks from lithologic well logs or individual AEM soundings- into plausible stratigraphic surfaces for a preliminary hydrostratigraphic model. 

File contains a preliminary description of the Data2HSM via GeoPDNN tool. Tool expected to be publicly available in Mid-late 2025.",
    "downloadURL": "https://data.cnra.ca.gov/dataset/ee3ccd25-b626-481a-84fd-e2ca89e1f3bd/resource/ab9d4d5b-0c7a-4374-a3bc-1ad6f1c25621/download/bc_analysistools_data2hsm_geopdnn_20241003.pdf"
  }
]
identifier b6402b39-5c3c-4271-ac08-5d4b8625bf12
issued 2024-09-17T19:53:29.423906
keyword 
[
  "AEM",
  "Airborne Electromagnetic",
  "aquifers",
  "basin characterization",
  "bulletin 118",
  "california department of water resources",
  "geophysical logs",
  "geophysics",
  "hydrostratigraphic model",
  "lithology logs",
  "sgma",
  "texture model"
]
modified 2026-06-23T23:42:59.174145
publisher 
{
  "name": "California Department of Water Resources",
  "@type": "org:Organization"
}
theme 
[
  "Natural Resources",
  "Water"
]
title DWR's Basin Characterization Program

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