Historical Rainfall-Runoff Analysis Using the Antecedent Precipitation Index

by B. J. Doeing, (M.ASCE), WEST Consultants, Inc, Carlsbad, United States,
R. A. Gaines, WEST Consultants, Inc, Carlsbad, United States,
T. M. James, WEST Consultants, Inc, Carlsbad, United States,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


A long term simulation of rainfall-runoff can be used when analyzing the potential for economic benefits or flood damages to result from changes in the watershed, for developing discharge-frequency curves and establishing flow durations, and for applications in unsteady flow hydraulic models. This paper presents a method for computing historical synthetic discharge hydrographs. The procedure uses rainfall gage data, synthetic unit hydrographs, and the antecedent precipitation index (API) to account for regional rainfall losses. A computer program named 'HUXRAIN' was developed by the Memphis District U.S. Army Corps of Engineers to simplify the procedure and to perform the analysis.

Subject Headings: Rainfall-runoff relationships | Precipitation | Hydrographs | Computer analysis | Rainfall | Hydraulic models | Computer software

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