Water Rights Analysis Package (WRAP) Modeling System

WRAP simulates management of the water resources of river/reservoir systems subject to priority-based water allocation. The modeling system facilitates assessment of hydrologic and institutional water availability and reliability for specified water use requirements. Basin-wide impacts of water resources development projects and management strategies may be evaluated. The software package is generalized for application to any river/reservoir system, with input files being developed for the particular river basin of concern. The latest (August 2015) version of the software and manuals may be downloaded from this site along with input files for the examples in the manuals and descriptions of additions and revisions reflected in current and past versions.

WRAP is documented by Reference (2015), Users (2015), Fundamentals (2013), Daily (2015), Hydrology (2013), and Salinity (2009) Manuals accessible through the download table below. The manuals are published as Texas Water Resources Institute (TWRI) technical reports (TRs) and are also available along with other related TRs cited in the manuals at the TWRI website. Several of the other TWRI reports can also be downloaded from the table below.

WRAP is incorporated in the Texas Commission on Environmental Quality (TCEQ) Water Availability Modeling (WAM) System. Development and expansion of WRAP has been sponsored by the TCEQ in collaboration with other agencies and the Texas water management community. An array of WAM information including WRAP input datasets for all the river basins of Texas is accessible through the TCEQ WAM website.

The last selection in the download table provides access to developmental test versions of WRAP programs currently being modified and drafts of the next editions of the manuals. The pdf with filename Modifications.PDF describes the improvements reflected in the drafts.   October 2017 drafts of the WRAP programs SIM and TABLES and the Reference, Users, and Fundamentals Manuals are currently available here for review.

The TCEQ WAM System and original WRAP are based on a monthly computational time step. The daily WRAP modeling capabilities described in the Daily Manual are still in a developmental status. The case study daily version of WAM datasets and reports for the Brazos, Colorado, Trinity,  Neches, Sabine, and Guadalupe and San Antonio (GSA) River Basins accessible through the download table below are subject to further testing and revision.  The pdf document DailyWAMs describes the daily WAM reports and input datasets.


WRAP Software Executable Programs
WRAP Manuals Manuals
Input Files for Examples Examples
Additions and Revisions Report Modifications
Other TWRI Publications Other Reports
Daily WAM Reports Daily WAM Reports
Daily WAM Input Files Daily WAM Datasets
Draft Software and Manuals Drafts

Ralph A. Wurbs
Zachry Department of Civil Engineering
Texas A&M University

This page was last updated on October 20, 2017.