Edwards and Trinity RegionalGroundwater Availability Model (GAM)This map shows the extent and location of the northern portion of the Edwards and Trinity Regional GAM.

In 2020, the Texas Water Development Board (TWDB) has begun to develop a regional groundwater availability model for the Edwards-Trinity (Plateau), Pecos Valley, Hill Country Trinity, and Edwards aquifers in Texas. A final report and model will be released in early 2023. Upon its release, this regional model will replace the current groundwater availability model for the Edwards-Trinity (Plateau) and Pecos Valley aquifers.

In 2004, the TWDB released a groundwater availability model of the Edwards-Trinity (Plateau) and Pecos Valley aquifers in Texas.

Edwards and Trinity Regional GAM

Stakeholder Advisory Forums (SAF)

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

ID Date Location
SAF 1 04/28/2020 Online meeting; Video recording (size: 121 MB)

 

Edwards-Trinity (Plateau) and Pecos Valley Aquifers GAM

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. Please see the GAM files download page for aquifer data.

Stakeholder Advisory Forums (SAF)

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

ID Date Location
PEST SAF 2 10/14/2009 Fredericksburg, Texas - Central Electric Co-Op (386 Friendship Lane)
PEST SAF 1 12/11/2008 Sonora, Texas - First United Methodist Church (201 North Water Ave.)
SAF 6 7/28/2004 Ozona, Texas - Crockett County Extension Office (1301 Avenue AA)
SAF 5 11/7/2002 Big Lake, Texas - Santa Rita Underground Water Conservation District
SAF 4 6/25/2002 Ozona, Texas - Crockett County Extension Office (1301 Avenue AA)
SAF 3 2/11/2002 Ozona, Texas - Crockett County Extension Office (1301 Avenue AA)
SAF 2 8/29/2001 Sonora, Texas - Four-H Civic Center
SAF 1 5/16/2001 Sonora, Texas - Four-H Civic Center

Other Resources

Please see the Edwards-Trinity (Plateau) and Pecos Valley aquifer pages and the Alternative One Layer Groundwater Flow Model of the Edwards-Trinity (Plateau) and Pecos Valley Aquifers page for other reports and publications.

For model runs see the GMA 3, GMA 4, GMA 7, and GMA 9 pages.

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