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http://dx.doi.org/10.3741/JKWRA.2008.41.6.587

A Practical Approach Determining an IDF formula with Limited Rainfall-Duration Data Availability  

Seong, Kee-Won (Dept. of Civil Engr., Konkuk University)
Publication Information
Journal of Korea Water Resources Association / v.41, no.6, 2008 , pp. 587-595 More about this Journal
Abstract
In order to aid the derivation of the IDF relationship for a station with insufficient duration-rainfall data, an approach to derive a simple and practical IDF formula is presented. The IDF formula is described simply by the term of the two parameters and a design frequency. The model parameters were estimated from a statistical technique based on the normal distribution of transformed rainfall intensities. In order to give the transformed data, both the Kruskal-Wallis statistic and the Manly transformation of duration-rainfall data were adopted. With the methods, the proposed IDF formula becomes a simpler model that compares well with conventional form. In addition, it allows avoiding an exceptional condition of the higher rainfall intensity for longer duration. The performance of the proposed formula was evaluated by using the limited rainfall data for short duration from two gauge stations. The result showed that the IDF formula developed in this work was an effective tool, providing a reliable relationship between the intensity and duration even though insufficient data are only available.
Keywords
Intensity-duration-frequency (IDF); Manly transformation; normal distribution;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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