Water Availability in the Trinity River Basin

Trinity River Basin Water Availability Maps

Click each image for a larger map

Full Authorization

Current Conditions

Data Input Files

Use these data files, which are compressed in ZIP format (Help with Downloading Files), with WRAP  (the Water Rights Analysis Package; what’s WRAP?):

• For new permanent water rights or amendments, use the full authorization data set. This model shows the amount of water that would remain available for appropriation if all currently permitted perpetual water rights withdrew their full authorized amount of water.
• For new term water rights and amendments, use the current conditions data set. This model shows the amount of water that would remain available for appropriation if all currently permitted water rights, both perpetual and term, withdrew the amount of water they are currently using. The current conditions data set includes return flows.

When you download and unzip either of these files, you will get these items:

• A text file. This file details recent changes to the respective data input file.
• The data input file for that model. This file is valid as of the date shown. Information can change as new water rights are added, existing water rights are amended, or, for the current conditions model, return flows are updated.
• GIS coverages. Use this file with the WRAP GUI (Water Rights Analysis Package graphical user interface). Be aware that:
  • These GIS coverages may not show all basin rights. (Some rights do not include authorization to store, take, or divert state water.)
  • The points marked in the GUI coverages do not represent the legal locations of the permitted rights. These points are intended solely for the purpose of displaying WRAP (Water Rights Analysis Package) output in ArcGIS.

  WRAP GUI. This is a file compressed in ZIP format that includes the executable and the WAM GUI Users Manual.

For More Information

Please call the Water Rights Permitting and Surface Water Availability Team at 512-239-4691 or e-mail us at wras@tceq.state.tx.us.

What’s WRAP?

WRAP is an application for predicting whether water will be available — and, if so, when and where — under a variety of conditions. This application is maintained by Dr. Ralph Wurbs  of Texas A&M University. Dr. Wurbs also maintains guides for using WRAP .