확률강우 기반 관거 개선 전⋅후 홍수 피해 개선 효과 분석

초록

This study assesses the increasing risk of urban flooding driven by the rising frequency of localized heavy rainfall caused by climate change and the expansion of impermeable surfaces due to urbanization. The XP-SWMM 2D model was utilized to simulate historical flooding events and evaluate the performance of an upgraded sewer system. Using 2011 rainfall data from the Daegu Meteorological Observatory, simulations were conducted for 30-year and 50-year return periods, considering urban redevelopment and sewer system enhancements. The results indicated no flooding under the 30-year return period scenario with the enhanced sewer system. However, localized flooding occurred in areas with insufficient pipeline capacity under the 50-year return period scenario, primarily due to inadequate drainage infrastructure in specific sections of the basin. The study recommends increasing sewer pipe diameters, modifying flow paths, and implementing Low Impact Development (LID) techniques to mitigate the disruption of the urban water cycle caused by rapid urbanization. Long-term strategies that integrate structural improvements with non-structural measures such as LID are crucial for reducing future flood risks and protecting urban areas vulnerable to flooding.

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