Gulf Coast Aquifer (southern portion)Groundwater Availability Model (GAM)

The Texas Water Development Board (TWDB) has developed a model of the Gulf Coast Aquifer 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. The report for the updated model has been released as TWDB Report 368.

Model Report

"Groundwater Resource Evaluation and Availablity of the Gulf Coast Aquifer in the Lower Rio Grande Valley of Texas." (2007) | erratum

Other Reports

"Estimation of Groundwater Recharge to the Gulf Coast Aquifer in Texas, USA."

Model Files

Please contact David Thorkildsen (512-936-0871) for a copy of model files. The model files are available in an electronic format with a small processing fee per CD/DVD.

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. The raw/source data may be requested on CD(s) in an electronic format with a processing fee by contacting David Thorkildsen (512-936-0871).

Stakeholder Advisory Forums (SAF)

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

Other Resources

Please see the Gulf Coast Aquifer, 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.