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

The Texas Water Development Board (TWDB) has developed a model of the Gulf Coast Aquifer System in the Lower Rio Grande Valley of Texas. The model was completed in 2003.

In 2007, TWDB completed an update to the original model for the southern portion of the Gulf Coast Aquifer System. The report for the updated model has been released as TWDB Report 368.

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 4 1/15/2003 McAllen, Texas
SAF 3 4/26/2002 McAllen, Texas
SAF 2 8/30/2001 Laredo, Texas
SAF 1 1/17/2001 McAllen, Texas

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 16 page.

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