Two-Parameter Synthetic Unit Hydrograph for Microcomputer Application

by P. W. Winsor, Texas Dep of Water Resources, Industrial Solid Waste Unit, Austin, TX, USA,
W. P. James, Texas Dep of Water Resources, Industrial Solid Waste Unit, Austin, TX, USA,
J. R. Williams, Texas Dep of Water Resources, Industrial Solid Waste Unit, Austin, TX, USA,



Document Type: Proceeding Paper

Part of: Hydraulics and Hydrology in the Small Computer Age

Abstract: A regression model was developed for estimating the unit hydrograph for ungaged watersheds. The model uses physical characteristics of the drainage basin to predict the parameters needed to construct the unit hydrograph. Stepwise regression analysis was used to reduce the number of physical and hydrological data to four significant variables. The four variables are the area, height, length, and watershed slope. The two parameter gamma distribution function from the HYMO hydrologic model was selected for use in the study. The two parameters are the time to peak (t//p) and a recession constant (K). Equations for estimating t//p and K were developed in the study. Equations for t//p and K were incorporated into the microcomputer hydrologic program called the A&M Watershed Model.

Subject Headings: Hydrologic models | Hydrographs | Watersheds | Parameters (statistics) | Regression analysis | Mathematical models | Drainage basins | Hydrologic data

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