San Antonio segment of the Edwards (Balcones Fault Zone) Aquifer Groundwater Availability Model (GAM)This map shows the extent and location of the Edwards BFZ Aquifer (San Antonio segment) GAM.

The U.S. Geological Survey in cooperation with the U.S. Department of Defense and the Edwards Aquifer Authority (EAA) have developed a GAM for the San Antonio segment of the Edwards Aquifer. However, the Texas Water Development Board will continue to maintain GWSIM as a model with an alternative hydraulic conductivity distribution and as an easier-to-use screening tool.

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 5 3/2/2004 San Antonio, Texas - Edwards Aquifer Authority Conference Center
SAF 4 5/9/2003 San Antonio, Texas - Edwards Aquifer Authority Conference Center
SAF 3 8/21/2002 San Antonio, Texas - Edwards Aquifer Authority Conference Center
SAF 2 2/21/2002 San Antonio, Texas - Edwards Aquifer Authority Conference Center
SAF 1 6/5/2001 San Antonio, Texas - The University of Texas at San Antonio

Other Resources

Please see the Edwards (Balcones Fault Zone) Aquifer page for other reports and publications.

For model runs see the GMA 10 page.

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