Edwards-Trinity (Plateau) and Pecos Valley aquifersGroundwater Availability Model (GAM)This map shows the extent and location of the Edwards-Trinity (Plateau) and Pecos Valley aquifers Groundwater Availability Model.

The Texas Water Development Board has developed a model of the Edwards-Trinity (Plateau) Aquifer that includes the Pecos Valley Aquifer. The model was completed in 2004.

The Texas Water Development Board contracted with URS Corporation in 2008 to determine the feasibility of the groundwater availability modeling program using parameter estimation (PEST) techniques and a high performance computing cluster to calibrate models, using the groundwater availability model for the Edwards-Trinity (Plateau) and Pecos Valley aquifers. The re-calibration project: (1) included stakeholder involvement; and (2) followed all TWDB protocols and standards for groundwater availability models.

Model Report

"Groundwater Availability Model for the Edwards-Trinity (Plateau) and Pecos Valley aquifers of Texas."

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
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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