This map shows the extent and location of the Queen City and Sparta Aquifers GAM.

Carrizo-Wilcox, Queen City, and Sparta AquifersGroundwater Availability Models (GAM)

The Texas Water Development Board contracted with INTERA Inc. (teamed with the Bureau of Economic Geology, and Brandes and Associates) to add the Queen City and Sparta aquifers as additional layers to the existing three Carrizo-Wilcox models. The project was completed and delivered in 2005.

The Queen City and Sparta models include the Carrizo-Wilcox Aquifer and supercede existing Carrizo-Wilcox GAMs: Carrizo-Wilcox (northern portion), Carrizo-Wilcox (central portion), and Carrizo-Wilcox (southern portion). However, model users interested in details about development of the Carrizo-Wilcox layers should refer to the 2003 Carrizo-Wilcox GAM reports.

Model Report

"Groundwater Availability Models for the Queen City and Sparta Aquifers."

"TWDB Response to Stakeholder Comments and Questions."

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 northern model grid.

Download central model grid.

Download southern 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
Pre − SAF 3/15/2002 Austin, Texas - Stephen F. Austin Building
SAF 1 2/28/2003 Austin, Texas - J.J. Pickle Research Campus
SAF 2 6/12/2003 San Antonio, Texas - San Antonio River Authority
SAF 3 1/9/2004 College Station, Texas - Centeq Research Plaza
SAF 4 4/29/2004 Nacogdoches, Texas - City Hall
SAF 5 7/13/2004 San Antonio, Texas - San Antonio River Authority
SAF 6 7/13/2004 Austin, Texas - Stephen F. Austin Building

Other Resources

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

For model runs see the GMA 11, GMA 12, and GMA 13 pages.