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Due to the recent increase in heavy localized rain caused by climate change, the risk of flooding in mountainous areas and small streams is growing daily. To prevent damage to human life and property, it is necessary to accurately estimate the amount of design flood in the small river basin. Recently, the Standard Guidelines for Flood Estimation (Ministry of Environment, 2019) have been proposed to reduce uncertainties such as the subjective interpretations of engineers, which differ in the flood dischargeestimation, and to ensure a certain level of uniformity. However, in the case of Gangwon region,where the watershed area is small and the channel slope is steep, it is necessary to carefully approach the application of Clark’s watershed tracking method, suggested in the standard guidelines. As Gangwon-Yeongdong region is expected to be more sensitive to localized heavy rainfall due to the influence of the Taebaek Mountains andhas a relatively steeper watershed mean slope and euro slope than other regions, this study compares and analyzes the results of Clark’s basin tracking method and the “rational method”, to derive a more reasonable flood calculation method. Additionally, it suggests an appropriate flood discharge estimation method for the small river in Gangwon-Yeongdong region. Consequently, the flood amount can reasonably be calculated by applying a rational formula rather than Clark’sbasin tracking method, in which the flood volume is underestimated, when calculating the flood volume of a small river in Yeongdong, Gangwon Province, which has a low flow effect of less than 5 km 2 .

A Consideration of the Estimation of the Design Flood for Small Basin in Gangwon Yeongdong Region