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Estimating Peak Flow Reduction in Small Reservoirs

by Dennis R. Horn, Univ of Idaho, Dep of Civil, Engineering, Moscow, ID, USA,



Document Type: Proceeding Paper

Part of: Hydraulics and Hydrology in the Small Computer Age

Abstract:

A microcomputer program is used to provide a simple and rapid estimate of the peak outflow from such reservoirs. Peak flow values, determined by flood frequency analysis or regional flood formula, are used along with pertinent watershed characteristics to develop a direct runoff hydrograph, based on an explicit mathematical representation of the Soil Conservation Service dimensionless unit hydrograph. Reservoir storage is expressed as an exponential function of outflow, resulting in a non-linear differential routing equation, which is solved implicitly using Newton's method.

Subject Headings: Reservoirs | Flood frequency | Peak flow | Water storage | Runoff | Outflow | Hydrographs

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