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http://dx.doi.org/10.3741/JKWRA.2006.39.6.521

Suggestion of Probable Rainfall Intensity Formula Considering the Pattern Change of Maximum Rainfall at Incheon City  

Han Man-Shin (Dept. of Civil & Environmental System Engineering, Univ. of Incheon)
Choi Gye-Woon (Dept. of Civil & Environmental System Engineering, Univ. of Incheon)
Chung Yeun-Jung (Dept. of Civil & Environmental System Engineering, Univ. of Incheon)
Ahn Kyung-Soo (Dept. of Civil & Environmental System Engineering, Univ. of Incheon)
Publication Information
Journal of Korea Water Resources Association / v.39, no.6, 2006 , pp. 521-531 More about this Journal
Abstract
The formula was proposed through the examination of probability rainfall intensity formula used in Incheon based upon recent occurrences of heavy rain and extraordinary storms. Random-time maximum annual rainfalls were estimated for durations from ten minutes to twenty-four hours from the data by Korea Meteorological Administration. Eleven types of probability distribution are considered to estimate probable rainfall depths for different storm durations at Incheon city. Three goodness-of-fit tests including Chi-square, Kolmogorov-Smirmov and framer Von Misses were used to analyze the tendency of recent rainfall. Considering maximum rainfall occurred, General Extreme Value(GEV) distribution was chosen as the appropriate probability distribution. Five types of probability rainfall formulas including Talbot type, Sherman type, Japanese type, unified type I and unified type II are considered to determine the best type for rainfall intensity at Incheon. The formula was determined considering the time of concentration of sewer system and river at Incheon city. Unified type I was chosen for its accuracy and was proposed to represent rainfall intensity of Incheon district.
Keywords
probability rainfall intensity; probability distribution; random-time; maximum annual rainfall;
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