Central portion of the Gulf Coast Aquifer SystemGroundwater Availability Model (GAM)This map shows the extent and location of the central portion of the Gulf Coast Aquifer System Groundwater Availability Model.

The Texas Water Development Board (TWDB) contracted with Waterstone Environmental Hydrology and Engineering, Inc. (who was teamed with Intera, Inc., Parsons Engineering Science, Inc., and several individual experts) to develop a model of the central part of the Gulf Coast Aquifer in Texas.

TWDB staff has since recalibrated the central part of the Gulf Coast Aquifer while honoring historical pumpage (see below).

Work is underway to update the groundwater availability models for both the Central and Southern sections of the Gulf Coast Aquifer. Please see the page for the Gulf Coast Aquifer System Groundwater Availability Model, which will include both GMAs 15 and 16.

Model Files

Please contact David Thorkildsen (512-936-0871) for a copy of the model files.

Model Grid

Model grid cells are geographically assigned to counties, groundwater conservation districts, river basins, groundwater management areas, and regional water planning areas within the model study area using a centroid based approach. The model grid is available in ESRI® shapefile format and comma-delimited text file.

Download model grid.

Aquifer Data

Aquifer data is only available as a package for the entire model area and requires GIS software for processing. Due to the size of raw/source data files for this model, this information has not been posted on the web. To request the raw/source data, contact David Thorkildsen (512-936-0871).

Stakeholder Advisory Forums (SAF)

Send us an email if you would like to receive SAF notifications.

ID Date Location
SAF 9 7/22/2004 Corpus Christi, Texas - Natural Resources Center (NRC) of the Texas A&M University
SAF 8 2/7/2003 Austin, Texas
SAF 7 10/22/2002 San Patricio Municipal Water District
SAF 6 8/15/2002 Bay City, Texas - Bay City Civic Center (201 7th Street)
SAF 5 5/1/2002 Corpus Christi, Texas - Natural Resources Center (NRC) of the Texas A&M University
SAF 4 2/20/2002 Victoria, Texas - Victoria Community Center Annex (2905 East North Street)
SAF 3 11/8/2001 Bay City, Texas - Bay City Civic Center (201 7th Street)
SAF 2 8/6/2001 Corpus Christi, Texas - Natural Resources Center (NRC) of the Texas A&M University
SAF 1 4/27/2001 Corpus Christi, Texas - Natural Resources Center (NRC) of the Texas A&M University

Other Resources

Please see the Gulf Coast Aquifer System, the GMA 16 Groundwater Flow Model, and the Research Projects in Support of Groundwater Models pages for other reports and publications.

For model runs see the GMA 15 page.

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