Short-term heavy rains caused by global warming could lead to urban flooding as well as damage to both people and property. Although Korea is taking active measures to reduce the impact of flood-related disasters through disaster impact assessments, these assessments mainly consist of qualitative evaluation procedures for urban inundation when designating districts for development projects. The recently developed “inundation determination and detention site size calculation program” has made it possible to review urban inundation hydraulic calculations, even when designating districts for development projects. However, there is still a limit to the hydraulic review and the utilization of Low Impact Development (LID) facilities due to the lack of linkage between the use of such facilities and the inundation determination program. Accordingly, it is necessary to develop a technique to utilize runoff coefficients in applying the LID in the flood determination program. Therefore, in this study, the flood control capacity of stormwater runoff reduction facilities at each LID facility was reviewed and the relationship with runoff coefficient was analyzed.
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