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Urban flooding is a recurring recent problem and has led to an increase in damages. Therefore, many studies have been conducted to mitigate urban floods. However, if rain is concentrated over a small area, the accuracy of runoff calculation is reduced because of inhomogeneities in rainfall distribution. Particularly in Seoul, which is mainly covered by impervious areas, the accuracy of runoff calculation of spatially concentrated rainfall is affected by the rainfall distribution. In this study, data from the Automated Surface Observing System at the Seoul Observatory and data from an Automatic Weather Station located near the study basin were used to calculate the runoff, and the respective results were compared. The Yongdap pump station was selected as the study subject, and the Environmental Protection Agency Storm Water Management model was applied to calculate the runoff. According to the results, the importance of spatial rainfall distribution was recognized, indicating that more accurate designs for rainfall and runoff calculation can be implemented.

Effects of the Difference between ASOS and AWS Data on Runoff Characteristics