Central portion of the Carrizo-Wilcox AquiferGroundwater Availability Model (GAM)This map shows the extent and location of the central portion of the Carrizo-Wilcox Aquifer GAM.

In 2015 the Texas Water Development Board (TWDB) contracted with INTERA Inc. (teamed with RW Harden and Associates, GSI Environmental Inc., Alan Dutton, Tom Ewing, and John Doherty) to evaluate faults in the central portion of the Carrizo-Wilcox Aquifer and improve their representation in an updated groundwater availability model for the central portion of the Carrizo Wilcox, Queen City, and Sparta Aquifers. The project was completed at the end of 2018.

Previously, the TWDB contracted with the Bureau of Economic Geology (which teamed with R.W. Harden and Associates, Inc., and HDR Engineering, Inc.) to develop a groundwater availability model of the central part of the Carrizo-Wilcox Aquifer in Texas. A final report and model were delivered in 2003.

This groundwater availability model supersedes the Carrizo-Wilcox, Queen City, Sparta Aquifers Groundwater Availability Model, but only in its central portion.

Final Numerical Model Report

Final Report, Volume I: Groundwater Availability Model for the Central Portion of the Sparta, Queen City, and Carrizo-Wilcox Aquifers

Final Report, Volume II: Groundwater Availability Model for the Central Portion of the Sparta, Queen City, and Carrizo-Wilcox Aquifers

Memorandum: Predictive Simulations Comparison Analysis Report

Final Report

Final Report: Field Studies and Updates to the Central Carrizo-Wilcox, Queen City, and Sparta GAM to Improve the Quantification of Surface Water-Groundwater Interaction in the Colorado River Basin

Stakeholder Advisory Forums (SAF)

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

ID Date Location
SAF 2 04/27/2017 Milano, Texas
SAF 1 11/20/2015 Milano, Texas

Other Resources

Please see the Carrizo-Wilcox, Sparta, and Queen City aquifer pages for other reports and publications.

For model runs see the GMA 12 page.

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