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.