Abstract
Due to urban population growth and increase of impervious ratio, backwardness of major infrastructure, increased rainfall intensity in climate change, and so on, the risk of flood damage in urban areas is increasing. In order to establish measures for this, quantitative analysis for flood damage that occurs in urban areas is needed. In this study, a methodology assessing high-risk areas vulnerable to flooding in units of drainage catchments by comparing the city`s flood zone and flood vulnerability factors is proposed. Using flood damage data, the city`s flood zone is delimited by inundation area and inundation frequency to be analyzed. Taking into account the ease of date collection, lowland areas, lack of sewer discharge capacity, imperviousness, and runoff curve number are selected as the flood vulnerability factors. As an application, high-risk drainage catchments vulnerable to flooding in Juanang stream watershed are identified.
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