An Hourly Precipitation Model for Ralston Creek, August 1976

(1976) An Hourly Precipitation Model for Ralston Creek, August 1976. University of Iowa

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Abstract

A compilation and analysis of the Iowa City Ralston Creek hourly precipitation record is made prior to the development of a stochastic data generation precipitation model intended for use in urban flooding hazard studies. The model is to be used to estimate the return periods of extreme storm events by means of extensive data generation. An unbroken historical record of 33 years of point hourly precipitation accumulations is constructed from a high density recording gage network within the watershed. A stochastic precipitation model, using statistical values computed from the historical data, is proposed for the time occurrence and intensity of storm events. The model is constructed for each of six divisions of the year to represent the seasonal non-stationarity observed in the historical data.