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River System Hydrology in Texas

R. Wurbs, Y. Zhang

River/reservoir system hydrology in the 15 major river basins and 8 coastal basins of Texas is explored using information derived from the Water Availability Modeling (WAM) System maintained by the Texas Commission on Environmental Quality and databases maintained by the Texas Water Development Board and the U.S. Geological Survey. River basin volume budgets and trend and frequency metrics for simulated naturalized and regulated stream flows and reservoir storage are developed using the WAM System. Trend and frequency statistics for observed precipitation, reservoir evaporation rates, and stream flow are also developed. Comparative analyses are performed to assess long-term changes. The research supports updating hydrology, incorporating environmental flow standards, and otherwise expanding the WAM System. However, the characterization of river system hydrology has broad general relevance for water resources planning and management. Analyses of long-term changes in hydrology are a central focus of the report, but the information provided describes river system hydrology in general.

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