A Study on Urban Flood Integrated Management Model: A Case Study of the Yugok Catchment

Abstract

Urban areas with high levels of impervious cover and inadequate flood-mitigation policies are becoming increasingly vulnerable to flooding compared to other areas. Despite nationwide efforts to mitigate flood damages, which primarily focus on major rivers, smaller rivers and urban catchments still experience frequent floods. This study utilized a semi-distributed hydrologic model and SWMM to consider the potential backwater effect on inland flooding. Through complementary analysis using observed rainfall and flow data from early October 2016 (Typhoon Chaba), the study was conducted on the Yugok Catchment. The results demonstrate the advantages of the semi-distributed model, which can handle spatial-temporal rainfall distribution and infiltration parameters while maintaining relatively faster calculation speed compared to a fully-distributed model. Furthermore, this study suggests that integrating the model with the SWMM can provide sufficient, accurate, and prompt information to enable effective flood crisis management plan.