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Determination of streamflow sequences for ungaged subbasins using soil and water assessment tool (SWAT)
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Allocation of the highly variable water resources of a ics. river basin to competing water users is a major concern throughout the world, particularly in regions where demands exceed supplies. Water availability determining the unappropriated flow and availability models, such as Water Rights Analysis Package (WRAP), require capabilities models could effectively be used for allocating the water to the users. Water for determining the water availability to water users at engaged as well as gaged locations. According to the present approach followed in water availability modeling, if a water right is in an engaged site, the water availability to that right is assumed to be the measured flow obtained from the downstream gaged site. The overall goal of this research was to evaluate hydrologic modeling capabilities for distributing naturalized streamflows from gaged locations to engaged water right locations. Naturalized streamflow represents the natural hydrology without the effects of upstream reservoirs and diversions. Naturalized streamflows are the historical gaged streamflow data adjusted to remove the impacts of reservoir construction, water use, and other human activities. The watershed selected for the study was the San Jacinto River Basin. The latitudes and longitudes of the stream gaging stations and the water right locations were obtained from TNRCC database. The subbasins were delineated for the control points and the water right locations. The subbasin raster layers were used as base maps for extracting the input data for the Soil and Water Assessment Tool (SWAT) model. The flows at each location were determined using SWAT model. The predictive ability of three methods', (1) Drainage area ratio method, (2) SWAT prediction, and (3) Regression approach, were compared. The Regression approach was found to be a better method over other methods. Hence, the regression relations were obtained between the predicted flows at the gaged locations and the predicted flows at the engaged water right locations. The streamflow sequences for the engaged water right locations were predicted using the regression relations for the period 1940-1980 from the naturalized flow values of the gaged locations.
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Includes bibliographical references: p. 69-72.
Raju, Balasubramaniam (1998). Determination of streamflow sequences for ungaged subbasins using soil and water assessment tool (SWAT). Master's thesis, Texas A&M University. Available electronically from
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