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Journal of the Korean Society of Hazard Mitigation 2014;14(4):321-332.
Published online August 31, 2014.
유역단위 우수유출저감대책의 침수피해 저감효과 비교분석
박창열, 신상영
A Comparative Analysis on the Flood Reduction Effects of Stormwater Storage and Infiltration Measures at a Catchment Scale
Changyeol Park, Sang Young Shin
Abstract
The purpose of this study is to evaluate the flood reduction effects of stormwater storage and infiltration facilities at a urban catchment scale and to compare the cost-effectiveness with drainage system improvements. Three policy scenarios to mitigate flood damage were developed by considering drainage system improvements, storage installations, and infiltration facility installations. The installation costs and flood reduction effects of the scenarios were compared to each other. The result shows that, while the stormwater storage and infiltration facilities were marginally effective in reducing the amount of peak flow and runoff volume, they were more effective in reducing the inundation damage. As rainfall increases, the cost-effectiveness of drainage improvements measures decreases relatively, yet the cost-effectiveness of stormwater storage and infiltration facility measures increases remarkably. This result indicates that stormwater storage and infiltration facilities could be helpful to mitigate urban flood risk more fundamentally as local heavy rainfall increases.
Key Words: Stormwater Storage and Infiltration Facilities; Drainage Systems; Cost-Effectiveness; Runoff Reduction; Flood Damage
요지
본 연구는 도시지역 내 유역단위에서 우수유출저감시설의 효과를 비교 분석한다. 이를 위해 배수시설(하수관거), 저류시설, 침투시설로 구성된 총 3가지 대책시나리오를 구성하였으며, 각 시나리오별로 유출-범람모의를 수행하였다. 각 대안별 소요비용을 산정하여 침수피해 저감효과와 비교하였다. 그 결과, 유역단위에서 저류시설과 침투시설의 유출저감효과는 상대적으로 크진 않지만, 침수피해 저감을 목적으로 한 우수유출저감시설의 설치는 하수관거에 대한 보완적 수단으로써 효과적일 수 있음을 확인하였다. 또한 강우규모가 커질수록 하수관거 대안의 경제성은 상대적으로 감소하고, 우수유출저감시설의 경제성은 크게 증가함을 알 수 있었다. 이는 설계기준을 초과하는 집중호우에의 탄력적 대응을 위해 우수유출저감시설의 확대 운영이 필요함을 시사한다.
핵심용어: 우수유출저감시설; 하수관거; 비용-효과성; 유출저감; 침수피해


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