This map shows the extent and location of the Edwards-Trinity (High Plains) Aquifer GAM.

Edwards-Trinity (High Plains) AquiferGroundwater Availability Model (GAM)

In 2006, the Texas Water Development Board (TWDB) contracted with Daniel B. Stephens and Associates (who was teamed with the Bureau of Economic Geology and several individual experts) to add the Edwards-Trinity (High Plains) to the existing southern part of the Ogallala aquifer GAM. The project was completed and delivered in March 2009.

This GAM includes the Ogallala (southern portion) Aquifer and supersedes the Ogallala (southern portion) Aquifer GAM. However, model users interested in details about development of the Ogallala (southern portion) Aquifer GAM should refer to the Ogallala (southern portion) Aquifer GAM report.

Model Report

"Groundwater Availability Model of the Edwards-Trinity (High Plains) Aquifer in Texas and New Mexico."

"Quick Reference for the Groundwater Availability Model for Southern Portion of the Ogallala and Edwards-Trinity (High Plains) Aquifers."

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.

ID Date Location
SAF 1 7/12/2006 Lubbock, Texas - High Plains Underground Water Conservation District No. 1
SAF 2 7/11/2007 Lubbock, Texas - High Plains Underground Water Conservation District No. 1
SAF 3 8/14/2008 Lubbock, Texas - High Plains Underground Water Conservation District No. 1
SAF 4 11/18/2008 Lubbock, Texas - High Plains Underground Water Conservation District No. 1

Other Resources

Please see the Edwards-Trinity (High Plains) and Ogallala aquifer pages for other reports and publications.

For model runs see the GMA 2 and GMA 7 pages.