Northern portion of the Gulf Coast Aquifer SystemGroundwater Availability Model (GAM)This map shows the extent and location of the northern portion of the Gulf Coast Aquifer System Groundwater Availability Model.

The US Geological Survey in cooperation with the Harris-Galveston Coastal Subsidence District, the Fort Bend Subsidence District, and the Lone Star Groundwater Conservation District has updated the model for the northern portion of the Gulf Coast Aquifer System. The final report and model were released in 2013.

Model Files

Please contact David Thorkildsen (512-936-0871) for a copy of the model files.

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 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. To request the raw/source data, contact 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 System and the Research Projects in Support of Groundwater Models pages for other reports and publications.

For model runs see the GMA 14 page.

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