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Statement of the Problem Rapid population and economic growth combined with depleting groundwater reserves are resulting in ever increasing demands on surface water resources in Texas, as well as elsewhere. The climate of the state is characterized by extremes of floods and droughts. Reservoirs are necessary to control and utilize the highly variable streamflow. Due to....

By Patrick E. Carriere,Ralph A. Wurbs--Texas Water Resources Institute--2007-11-30
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The four main crops produced in the Texas High Plains have been the subject of water management research for several decades by the Texas Agricultural Experiment Station and the USDA/Agricultural Research Service. As expected, experimental results for yield and water use efficiency have varied for these four major crops, but many common principles have likewise emerged ....

By Wayne R. Jordan,John M. Sweeten--Texas Water Resources Institute--2007-11-30
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Accurate estimates of surface exchange rates for volatile pollutants in bays are needed to allow predictions of pollutant movement and retention time. The same types of estimates can be used to calculate reaeration rates. The tracer gas technique has been used to measure surface gas transfer rates in rivers, and to a lesser extent, in estuaries. Application of the techn....

By Edward R. Holley,Sarah H. Baker--Texas Water Resources Institute--2007-11-30
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In this research project, a methodology for automating the forecasting of municipal daily water use is developed and implemented in a microcomputer program called WATCAL. An automated forecast system is devised by modifying the previously-developed WATFORE model so that potential seasonal water use is calculated from a Fourier series fitted to seven-day weighted moving ....

By David R. Maidment,Douglas T. Shaw--Texas Water Resources Institute--2007-11-30
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Rice is currently produced on approximately 400,000 acres in the Texas Coastal Prairie. This rice consumes 1.8 million acre-feet of water a year or 13 percent of Texas' renewable water resources. The Texas Coastal Prairie is a delicate ecosystem providing winter homes for many birds and water fowl and breeding grounds for marine life in the marshes of the Gulf Coast. Th....

By Douglas M. Nesmith,Lloyd R. Hossner,Gerry N. McCauley--Texas Water Resources Institute--2007-11-30
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Effective management of its surface water resources is essential to the continued growth and prosperity of the state of Texas. Rapid population and economic growth combined with depleting ground water reserves are resulting in ever increasing demands being placed upon the surface water resources. The climate of the state is characterized by floods and droughts. Reservoi....

By Ralph A. Wurbs--Texas Water Resources Institute--2007-11-30
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Rapid population and economic growth in Texas is accompanied by increased needs for water supply and flood control. Depleting groundwater reserves are resulting in an increased reliance on surface water. The rising cost of fossil fuel during the 1970's has focused attention on increasing hydroelectric power generation. Instream flow needs for fish and wildlife habitat a....

By Michael N. Tibbets,L. Morris Cabezas,Ralph A. Wurbs--Texas Water Resources Institute--2007-11-30
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This research investigated the movement of a surface flow profile over an infiltrating soil under conditions of surge flow, and theory related thereto, for use in preliminary design procedures for surge irrigation systems. Four specific research areas were: a) development of a surge flow infiltration model; b) the effect Or wetted perimeter on infiltration in furrow; c)....

By Allie W. Blair,Ernest T. Smerdon--Texas Water Resources Institute--2007-11-30
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A simulation study was performed to analyze the relationship between the volume of moisture stored in a soil profile and the rate of percolation and subsurface return flow. The simulation study was derived on the basis of the Richards equation. The one-dimensional form of the Richards equation was used for the percolation process and the two-dimensional form of the Rich....

By J. L. Nieber--Texas Water Resources Institute--2007-11-30
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A flexible, recursive programming model of crop production on the Texas High Plains was developed. Besides the linear programming (LP) Optimization routine and recursive feedback section, the model also includes a matrix generator and report writer to make scenario definition and output analysts faster and easier. The production activities for each run of the model, ar....

By J. R. Ellis,R. D. Lacewell,D. R. Reneau--Texas Water Resources Institute--2007-11-30
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In 1979, nine small forested watersheds were instrumented in East Texas to determine the effect of intensive forest management practices on water quantity and quality. Three replications of three treatments were used: 1) clearcutting - followed by shearing ant windrowing, 2) clearcutting - followed by roller chopping and 3) undisturbed control. Following treatment, the ....

By A. T. Weichert,R. W. Knight,W. H. Blackburn,M. G. DeHaven--Texas Water Resources Institute--2007-11-30
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There are about 15 million acres of cropland in the U.S. that are irrigated from aquifers which are incurring declining water levels (sloggett). This is primarily in the Great Plains Region where irrigation water is pumped from the Ogallala Aquifer. Mining from the aquifer is estimated at 14 million acre feet per year (Frederick and Hanson). The declining groundwater su....

By Duane R. Reneau,John R. Ellis,John G. Lee,Ronald D. Lacewell--Texas Water Resources Institute--2007-11-30
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