Northern Portion of the Carrizo-Wilcox Aquifer Groundwater Availability Model (GAM)This map shows the extent and location of the northern portion of the Carrizo-Wilcox Aquifer GAM.

In 2017, the Texas Water Development Board (TWDB) contracted with GSI Environmental, Inc. to update the groundwater availability model of the northern part of the Carrizo-Wilcox, Queen City, and Sparta aquifers in Texas. A final report and model were released in April 2021.

Current GAM

Other Resources

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

For model runs see the GMA 11 page.