Gulf Coast Aquifer (northern portion)Groundwater Availability Model (GAM)
The Texas Water Development Board (TWDB) cooperated with the USGS, the Harris-Galveston Coastal Subsidence District, City of Houston, San Jacinto River Authority, and the Fort Bend Subsidence District to develop a model for the northern portion of the Gulf Coast Aquifer. A final report and model were delivered in 2004.
Adjustments were made to the calibrated model during the development of the predictive runs. These adjustments are dicussed in USGS Report 2005-5024 (see below).
Model Report
"Hydrogeology and Simulation of Ground-Water Flow and Land-Surface Subsidence in the Northern Part of the Gulf Coast Aquifer System, Texas." | USGS SIR 2004-5102.
"Evaluation of Ground-Water Flow and Land-Surface Subsidence Caused by Hypothetical Withdrawals in the Northern Part of the Gulf Coast Aquifer System, Texas." | USGS SIR 2005-5024.
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.
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 |
|---|---|---|
| SAF 8 | 2/17/2004 | Friendswood, Texas - Harris-Galveston Coastal Subsidence District (1660 West Bay Area Blvd) |
| SAF 7 | 7/24/2003 | Friendswood, Texas - Harris-Galveston Coastal Subsidence District (1660 West Bay Area Blvd) |
| SAF 6 | 4/24/2003 | Friendswood, Texas - Harris-Galveston Coastal Subsidence District (1660 West Bay Area Blvd) |
| SAF 5 | 1/29/2003 | Friendswood, Texas - Harris-Galveston Coastal Subsidence District (1660 West Bay Area Blvd) |
| SAF 4 | 6/5/2002 | Friendswood, Texas - Harris-Galveston Coastal Subsidence District (1660 West Bay Area Blvd) |
| SAF 3 | 11/15/2001 | Friendswood, Texas - Harris-Galveston Coastal Subsidence District (1660 West Bay Area Blvd) |
| SAF 2 | 8/2/2001 | Friendswood, Texas - Harris-Galveston Coastal Subsidence District (1660 West Bay Area Blvd) |
| SAF 1 | 5/2/2001 | Friendswood, Texas - Harris-Galveston Coastal Subsidence District (1660 West Bay Area Blvd) |
Other Resources
Please see the Gulf Coast Aquifer and the Research Projects in Support of Groundwater Models pages for other reports and publications.
For model runs see the GMA 14 page.