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Water Availability Models

Information about the Water Availability Model (WAM) and the Water Rights Analysis Package (WRAP). Explanation of various river basin input and GIS files. WRAP input files for running the water availability models and GIS river basin files.

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What is a water availability model?

A water availability model is a computer-based simulation predicting the amount of water that would be in a river or stream under a specified set of conditions. The model used by TCEQ consists of two parts:

  • the modeling program, "WRAP"(Water Rights Analysis Package)
  • text files that contain basin-specific information for WRAP to process (input file or WAM)

How are these models used?

TCEQ staff use the models in evaluating water rights applications to help determine if water would be available for a newly requested water right or amendment, or if an amendment might affect other water rights.

  • Full Authorization simulation model:
    • all water rights utilize their maximum authorized amounts
    • used to evaluate applications for perpetual water rights and amendments
  • Current Conditions simulation model:
    • includes return flows
    • used to evaluate applications for term water rights and amendments

If water is available, these models estimate how often water would be available. For example, would it be available only during very wet times, or would it also be available during very dry times?

In evaluating an application for a new appropriation of water, and some applications for amendments, TCEQ staff must also consider recommended environmental flow needs. Environmental flow needs include instream flows and freshwater inflows to bays and estuaries.

Applicants may also use the models when preparing to apply for a new water right or an amendment.

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WRAP: The Modeling Program

The WRAP modeling system includes computer programs for processing basin input files for each river basin in Texas. Texas A&M University Exit the TCEQ maintains these programs, executables, and manuals.

Input files for the model

  • New permanent water rights or amendments
    • Full Authorization data set: This model shows the amount of water that would remain available for appropriation if all currently permitted perpetual water rights holders withdrew their full authorized amount of water.
  • New term water rights and amendments
    • Current Conditions data set: This model shows the amount of water that would remain available for appropriation if all permitted water rights holders withdrew the amount of water they are now using. Includes return flows.

What do I get with the files?

  • Full Authorization (Run 3) or Current Conditions (Run 8) data sets include:
    • *.dat, *.dis, *.eva, *.fad, *.flo, *.txt files and others as applicable.
    • Note: Not all basins include all of these files.
  • GIS files include:
    • Water Rights (WR) shapefile: legal representation of all features (reservoirs, diversion points, discharge points, etc.) authorized in the water right
    • Control Points (CP) shapefile: represents the water rights as modeled in the WAM. Not all water rights have CPs if they do not have the authorization to store or divert state water
  • WRAP GUI shapefile: intended solely for displaying WRAP output using the WRAP GUI executable, including CP_ID, RES_ID, WR_ID and IF_ID files.
  • Flowline shapefile: a representation of the watercourses in the basin.

Input files are compressed in "ZIP" format. You will need the WRAP GUI (ZipFile Zip File ) that includes the executable and the user’s manual.

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WRAP Input files and GIS files by River Basin



Canadian River Basin:
Full Authorization |Current Conditions | GIS


Red River Basin:
Full Authorization | Current Conditions | GIS


Sulphur River Basin:
Full Authorization | Current Conditions | GIS


Cypress Creek Basin*:
Full Authorization | Current Conditions files are being updated and are not available at this time | GIS


Sabine River Basin*:
Full Authorization | Current Conditions files are being updated and are not available at this time | GIS


Neches River Basin:
Full Authorization | Current Conditions | GIS


Neches - Trinity Coastal Basin:
Full Authorization | Current Conditions | GIS


Trinity River Basin:
Full Authorization | Current Conditions | GIS


Trinity - San Jacinto Coastal Basin:
Full Authorization | Current Conditions | GIS


San Jacinto River Basin*:
Full Authorization | Current conditions files for this basin are under construction | GIS


Brazos River Basin and San Jacinto Brazos Coastal Basin*:
WAM files for this basin are being updated and are currently unavailable. | GIS


Colorado River Basin and Brazos - Colorado Coastal Basin*:
WAM files for this basin are being updated and are currently unavailable. | GIS


Colorado-Lavaca Coastal Basin*:
WAM files for this basin are being updated and are currently unavailable. | GIS


Lavaca River Basin*:
Full Authorization | Current Conditions files are being updated and are not available at this time | GIS


Lavaca - Guadalupe Coastal Basin*:
WAM files for this basin are being updated and are currently unavailable. | GIS


Guadalupe River Basin and San Antonio River Basin*:
Full Authorization | Current conditions files for this basin are under construction | GIS


San Antonio - Nueces Coastal Basin:
Full Authorization | Current Conditions | GIS


Nueces River Basin:
Full Authorization | Current Conditions | GIS


Nueces - Rio Grande Coastal Basin:
Full Authorization | Current Conditions | GIS


Rio Grande Basin*:
Full Authorization | Current conditions files for this basin are under construction | GIS

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Input Files
Contact Us

If you need more information, please contact: the Surface Water Availability Team at 512-239-4691 or email: wrap@tceq.texas.gov