Effect of Storm Distribution on Watershed Stormwater Management

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by John M. Maslanik, Chester Engineers, Pittsburgh, United States,
Uzair M. Shamsi, Chester Engineers, Pittsburgh, United States,

Document Type: Proceeding Paper

Part of: Water Resources Planning and Management and Urban Water Resources:

Abstract: This paper presents a case study illustrating the effect of the selection of rainfall distribution pattern upon the ability of a calibrated rainfall-runoff simulation model to replicate observed watershed discharge frequency characteristics determined through the statistical analysis of long term stream gaging records. While it is generally recognized that floods of a given recurrence frequency are not necessarily caused by rain storms of comparable frequency, the observed impact of rainfall distribution upon model produced estimates of discharge frequencies illustrates the need for caution in the selection of storm distributions for use in rainfall-runoff simulations and the interpretation of the results.

Subject Headings: Frequency distribution | Rainfall frequency | Rainfall-runoff relationships | Model analysis | Flood frequency | Rain water | Watersheds | Water discharge |

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