Llano Uplift Aquifer System Groundwater Availability Model (GAM)

This map shows the extent and location of the Llano Uplift Aquifer System Groundwater Availability Model.The Texas Water Development Board has developed a groundwater availability model for the Llano Uplift Aquifer System (Ellenburger-San Saba, Hickory, and Marble Falls). The numerical model report is now available.

Current GAM

Numerical Model Report

"Numerical Model Report: Minor Aquifers in Llano Uplift Region of Texas."


Conceptual Model Report

"Conceptual Model Report: Minor Aquifers in Llano Uplift Region of Texas."

Please see the GAM files download page for the geodatabase containing the source data files.


Other Pertinent Studies

"Llano Uplift Aquifer System − Structure and Stratigraphy."


Model Files and Associated Data

Please see the GAM files download page for the current model files and associated data.

Aquifer data is only available as a package for the entire model area and requires GIS software for processing. Please see the GAM files download page for aquifer data.


Stakeholder Advisory Forums (SAF)

ID Date Location
SAF 1 7/17/2012 Fredericksburg, Texas - Hill Country University Center
SAF 2 9/30/2014 Fredericksburg, Texas - Hill Country University Center
SAF 3 3/16/2016 Fredericksburg, Texas - Hill Country University Center

Other Resources

Please see the Ellenburger-San Saba, Hickory, and Marble Falls, aquifer pages, and the Research Projects in Support of Groundwater Models page for other reports and publications.

Research Projects in Support of Groundwater Models