| Title |
Analysis of Runoff Reduction Effect of Flood Mitigation Policies based on Cost-Benefit Perspective |
| Authors |
지희원(Jee, Hee Won) ; 김현주(Kim, Hyeonju) ; 서승범(Seo, Seung Beom) |
| DOI |
https://doi.org/10.12652/Ksce.2023.43.6.0721 |
| Keywords |
홍수 저감; 우수배제; 저영향개발; SWMM; 비용-편익 분석 Flood mitigation; Rainwater drainage; Low impact development; SWMM; Cost-Benefit analysis |
| Abstract |
As the frequency of extreme rainfall events increase due to climate change, climate change adaptation measures have been proposed by the central and local governments. In order to reduce flood damage in urban areas, various flood response policies, such as low impact development techniques and enhancement of the capacity of rainwater drainage networks, have been proposed. When these policies are established, regional characteristics and policy-effectiveness from the cost-benefit perspective must be considered for the flood mitigation measures. In this study, capacity enhancement of rainwater pipe networks and low impact development techniques including green roof and permeable pavement techniques are selected. And the flood reduction effect of the target watershed, Gwanak campus of Seoul National University, was analyzed using SWMM model which is an urban runoff simulation model. In addition, along with the quantified urban flooding reduction outputs, construction and operation costs for various policy scenarios were calculated so that cost-benefit analyses were conducted to analyze the effectiveness of the applied policy scenarios. As a result of cost-benefit analysis, a policy that adopts both permeable pavement and rainwater pipe expansion was selected as the best cost-effective scenario for flood mitigation. The research methodology, proposed in this study, is expected to be utilized for decision-making in the planning stage for flood mitigation measures for each region. |