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Advances in Meteorology
Volume 2015, Article ID 528564, 10 pages
http://dx.doi.org/10.1155/2015/528564
Research Article

A Cumulative Rainfall Function for Subhourly Design Storm in Mediterranean Urban Areas

Department of Civil Engineering, University of Calabria, Via P. Bucci, Cubo 42/b, 87036 Rende, Italy

Received 24 March 2015; Revised 17 June 2015; Accepted 21 June 2015

Academic Editor: Guillermo Baigorria

Copyright © 2015 Marco Carbone et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Design storms are very useful in many hydrological and hydraulic practices and are obtained from statistical analysis of precipitation records. However considering design storms, which are often quite unlike the natural rainstorms, may result in designing oversized or undersized drainage facilities. For these reasons, in this study, a two-parameter double exponential function is proposed to parameterize historical storm events. The proposed function has been assessed against the storms selected from 5-year rainfall time series with a 1-minute resolution, measured by three meteorological stations located in Calabria, Italy. In particular, a nonlinear least square optimization has been used to identify parameters. In previous studies, several evaluation methods to measure the goodness of fit have been used with excellent performances. One parameter is related to the centroid of the rain distribution; the second one is related to high values of the standard deviation of the kurtosis for the selected events. Finally, considering the similarity between the proposed function and the Gumbel function, the two parameters have been computed with the method of moments; in this case, the correlation values were lower than those computed with nonlinear least squares optimization but sufficiently accurate for designing purposes.