Southern Portion of the Carrizo-Wilcox Aquifer Groundwater Availability Model (GAM)
In 2019, the Texas Water Development Board (TWDB) contracted with GSI Environmental, Inc. to update the groundwater availability model of the southern part of the Carrizo-Wilcox, Queen City, and Sparta aquifers in Texas. A final report and model will be released in late 2023.
Draft Numerical Model Report
The Draft Final Numerical Model report and model files for the Southern Carrizo-Wilcox, Queen City, and Sparta Groundwater Availability Model update are available for Stakeholder review. Please submit written comments to Jean Perez before Monday, October 31, 2022.
- Draft Final Numerical Model Report: Update to the Groundwater Availability Model for Southern Portion of the Carrizo-Wilcox, Queen City, and Sparta Aquifers.
- Draft Technical Memorandum 1
- Draft Technical Memorandum 2
- Draft Technical Memorandum 3
- Draft Technical Memorandum 4
- Draft Technical Memorandum 5
General Use Disclaimer: The following model files were developed for regional scale use only and should not be used for local scale or individual site locations. The file sets are currently intended only for public review prior to the new DRAFT Groundwater Availability Model for the Southern Portion of the Carrizo-Wilcox, Queen City, and Sparta Aquifers being released as an official GAM. Furthermore, the files are released on condition that neither the TWDB nor the State of Texas shall be held liable for any damages resulting from its authorized or unauthorized use.
- Draft Final Model Files
- Technical Memorandum 1 files
- Technical Memorandum 2 files 1
- Technical Memorandum 2 files 2
- Technical Memorandum 3 files 1
- Technical Memorandum 3 files 2
- Technical Memorandum 4 files
- Technical Memorandum 5 files
Draft Conceptual Model Report
Stakeholder Advisory Forums (SAF)
Send us an email if you would like to receive SAF notifications.
| ID | Date | Location |
|---|---|---|
| SAF 1 | 8/2/2019 | Pleasanton, Texas | SAF 2 | 3/4/2021 | Online meeting (video) | SAF 3 | 7/22/2022 | Pleasanton, Texas |
Model Report (2004, v. 2.01)
"Groundwater Availability Models for the Queen City and Sparta Aquifers."
"TWDB Response to Stakeholder Comments and Questions."
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.
Model Report (2003)
We are listing the 2003 report above as a resource on the conceptual analysis and data for the Carrizo-Wilcox Aquifer, an aspect that was not addressed by the 2004 GAM report.
Other Resources
Please see the Carrizo-Wilcox, Sparta, and Queen City aquifer pages for other reports and publications.
For model runs see the GMA 13 page.