GAM Downloads

View All Models Download Other Project Files

Most of the model and data files linked on this page are very large (up to 25 gigabytes when uncompressed), and may take a long time to download.

Your requested data may often be compressed into 7-Zip format for efficient downloading. The TWDB uses 7-Zip 21.07 to compress data files and should be compatible with most zip file format utility software. You may also use Google to search for other free alternative zip file format utility software. Please note that any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the TWDB nor the State of Texas.

General Use Disclaimer: Although the data have been subjected to standard TWDB review protocols and are substantially complete, the TWDB reserves the right to revise the data pursuant to further analysis and review. All groundwater availability modeling data were developed for regional scale use only, and should not be used for local scale or individual site locations. Furthermore, the data are released on condition that neither the TWDB nor the State of Texas shall be held liable for any damages resulting from their authorized or unauthorized use.

Model Model File Geodatabase Model Grid Report Other Data
Brazos River Alluvium Aquifer GAM Model (63MB zipped, 354MB unzipped) Geodatabase (4.1GB zipped, 4.7GB unzipped) Model grid (last updated: 07/10/2020; 3MB zipped, 22MB unzipped)
Blossom Aquifer GAM Model (23MB zipped, 345MB unzipped) Geodatabase (132MB zipped, 185MB unzipped) N/A N/A
Bone Spring-Victorio Peak Aquifer GAM Model (61.6MB zipped, 350MB unzipped) N/A Model grid (last updated: 01/06/2020; 6MB zipped, 24MB unzipped) Report N/A
Capitan Reef Complex Aquifer GAM Model (1.1GB zipped, 3.9GB unzipped) Geodatabase (876MB zipped, 1.2GB unzipped) Model grid (last updated: 01/06/2020; 10MB zipped, 36MB unzipped) Structure
Central Carrizo-Wilcox, Queen City, and Sparta Aquifers GAM (version 3.02) Model (3.0GB zipped, 5.4GB unzipped) Geodatabase (last updated: 10/09/2020; 31MB zipped, 112MB unzipped) N/A N/A
Northern Carrizo-Wilcox, Queen City, and Sparta Aquifers GAM (version 3.01) Model (178MB zipped, 7.6GB unzipped) Geodatabases (1.9GB zipped, 9.4GB unzipped) Model grid (last updated: 06/09/2021; 25MB zipped, 78MB unzipped) Leapfrog Files
Southern Carrizo-Wilcox, Queen City, and Sparta Aquifers GAM (version 2.01) Model (85MB zipped, 3.4GB unzipped) Geodatabase (1.2GB zipped, 13.4GB unzipped) Model grid (last updated: 01/06/2020; 2MB zipped, 16MB unzipped) N/A
Edwards (BFZ) Aquifer (Barton Springs Segment) GAM Model and source data (14.7MB zipped, 1.1GB unzipped) N/A Model grid (last updated: 01/06/2020; 1.5MB zipped, 6MB unzipped) Report N/A
Edwards (BFZ) Aquifer (Northern Segment) GAM Model (783MB zipped, 11.7GB unzipped) Geodatabase (1.2GB zipped, 15.3GB unzipped) Model grid (last updated: 01/06/2020; 4 MB zipped, 15 MB unzipped) Report N/A
Edwards (BFZ) Aquifer (San Antonio Segment) GAM Model (0.7MB zipped, 13.6MB unzipped) N/A Model grid (last updated: 01/06/2020; 22MB zipped, 80MB unzipped) N/A
Edwards-Trinity (Plateau) and Pecos Valley aquifers GAM Model (152MB zipped, 4.6GB unzipped) Geodatabase (141MB zipped, 403MB unzipped) Model grid (last updated: 01/06/2020; 18MB zipped, 30MB unzipped) Report N/A
GMA 16 groundwater flow model Model (17MB zipped, 209MB unzipped) Geodatabase (2.3GB zipped, 7.6GB unzipped) N/A GMA 16 Report N/A
Gulf Coast Aquifer (central portion) GAM Model (27.2MB zipped, 0.9GB unzipped) Geodatabase (718MB zipped, 4.2GB unzipped) Model grid (last updated: 01/06/2020; 1MB zipped, 4MB unzipped)
Gulf Coast Aquifer (northern portion) GAM Model (259MB zipped, 1.1GB unzipped) Geodatabase (1.1GB zipped, 17.5GB unzipped) Model grid (last updated: 01/06/2020; 3.5 MB zipped, 12MB unzipped) Recharge Estimate Report
Gulf Coast Aquifer (southern portion) GAM Model (119MB zipped, 3.4GB unzipped) Geodatabase (35.6MB zipped, 104MB unzipped) Model grid (last updated: 01/06/2020; 1MB zipped, 3.3MB unzipped) Recharge Estimate Report
Cross Timbers Aquifer GAM N/A Geodatabase (size: 1.8GB zipped) N/A Conceptual Report Leapfrog Geo Model
High Plains Aquifer System GAM Model (1.8GB zipped, 12.5GB unzipped) Geodatabase (8GB zipped, 25.2GB unzipped) Model grid (last updated: 01/06/2020; 30MB zipped, 113MB unzipped) N/A
Hueco Bolsons GAM Model (125MB zipped, 918MB unzipped) N/A N/A N/A
Mesilla Bolsons GAM Model (3.5MB zipped, 12.5GB unzipped) N/A N/A N/A
Igneous and West Texas Bolsons (Wild Horse Flat, Michigan Flat, Ryan Flat, and Lobo Flat) aquifers GAM Model (94MB zipped, 2.8GB unzipped) Geodatabase (363MB zipped, 4.1GB unzipped) Model grid (last updated: 01/06/2020; 4MB zipped, 14MB unzipped) N/A
Kinney County model Model (15MB zipped, 880MB unzipped) N/A N/A Report N/A
Lipan Aquifer GAM Model (92MB zipped, 880MB unzipped) Geodatabase (337MB zipped, 2.8GB unzipped) Model grid (last updated: 01/06/2020; 0.5MB zipped, 1.4MB unzipped) N/A
Llano Uplift Aquifer System GAM Model (1.8GB zipped, 6GB unzipped) Geodatabase (814MB zipped, 1.5GB unzipped) Model grid (last updated: 01/06/2020; 34MB zipped, 130MB unzipped) Structure and Stratigraphy
Lower Rio Grande Valley transport model Model (5GB zipped, 26.3GB unzipped) Geodatabase (2.9GB zipped, 3.1GB unzipped) N/A Predictive Model - this is the Model link
Nacatoch Aquifer GAM Model (76MB zipped, 3.3GB unzipped) Geodatabase (502MB zipped, 9.7GB unzipped) Model grid (last updated: 01/06/2020; 16MB zipped, 60MB unzipped) Report N/A
Rustler Aquifer GAM Model (17MB zipped, 1.3GB unzipped) Geodatabase (503MB zipped, 4.4GB unzipped) Model grid (last updated: 01/06/2020; 11MB zipped, 39MB unzipped) Report N/A
Seymour and Blaine Aquifers GAM Model (459MB zipped, 16.3GB unzipped) Geodatabase (701MB zipped, 17.9GB unzipped) Model grid (last updated: 01/06/2020; 2MB zipped, 7MB unzipped) Report N/A
Seymour Aquifer in Haskell, Knox, and Baylor counties GAM Model (23MB zipped, 1.4GB unzipped) Geodatabase (157MB zipped, 3.5GB unzipped) Model grid (last updated: 01/06/2020; 11MB zipped, 38MB unzipped) N/A
Trinity Aquifer (Hill Country) GAM Model (17MB zipped, 143B unzipped) Geodatabase (120MB zipped, 867MB unzipped) Model grid (last updated: 01/06/2020; 0.5MB zipped, 1.6MB unzipped) Report SwRI Conceptual Model
Trinity (northern portion) and Woodbine Aquifers GAM Model (692MB zipped, 726MB unzipped) Data and model (4.8GB zipped, 7.1GB unzipped) Model grid (last updated: 01/06/2020; 137MB zipped, 500MB unzipped) Report Appendix Log and Aquifer Data
West Texas Bolsons (Red Light, Green River, and Eagle Flat) Aquifer GAM Model (5MB zipped, 45MB unzipped) Geodatabase (555MB zipped, 2.2GB unzipped) Model grid (last updated: 01/06/2020; 0.5MB zipped, 1.4MB unzipped) Report N/A
West Texas Bolsons (Presidio and Redford) Aquifer GAM Model (81MB zipped, 92MB unzipped) Geodatabase (563MB zipped, 590MB unzipped) Model grid (last updated: 01/06/2020; 5MB zipped, 16MB unzipped) N/A
Yegua-Jackson Aquifer GAM Model (149MB zipped, 1.8GB unzipped) Geodatabase (1.7GB zipped, 13.7GB unzipped) Model grid (last updated: 07/09/2020; 6MB zipped, 23MB unzipped) Report Structure
Top