Hill Country portion of the Trinity AquiferGroundwater Availability Model (GAM)This map shows the extent and location of the Hill Country portion of the Trinity Aquifer Groundwater Availability Model.

The Texas Water Development Board (TWDB) completed this model in 2000 in cooperation with the Trinity Aquifer Advisory Committee which includes members of local groundwater districts, river authorities, county governments, regional water planning groups, and concerned citizens.

In 2009, the TWDB completed an update to the model to include the Lower Trinity as a fourth model layer.

In 2017, the TWDB contracted with Southwest Research Institute to update the conceptual model for the Trinity Aquifer in the Hill Country region with the goal of incorporating the Trinity strata to the east into the Hill County Trinity GAM. The project is expected to be completed in 2019.

Conceptual model update for the Hill Country Trinity Aquifer GAM

Stakeholder Advisory Forums (SAF)

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

ID Date Location
SAF 1 6/5/2017 San Antonio, Texas - Southwest Research Institute

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Hill Country Trinity Aquifer GAM

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 3 8/17/2009 Kerrville, Texas - Upper Guadalupe River Authority Auditorium (125 Lehmann Dr)
SAF 2 12/12/2006 Johnson City, Texas - Blanco-Pedernales Groundwater Conservation District (601 West Main)
SAF 1 6/7/2005 Boerne, Texas - Kendall County Historic Courthouse

Other Resources

Please see the Trinity Aquifer page for other reports and publications.

For model runs see the GMA 9 page.

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