LID 설계시 식생체류지간 연결에 의한 강우유출수 저감 효과분석 = The Effect of Connected Bioretention on Reduction of Surface Runoff in LID Design

다국어 초록 (Multilingual Abstract)

Recently Low Impact Development (LID) is recently used in Korea to control urban runoff and nonpoint source pollution. In this study, the effect of connecting three bioretention as LID-BMP on reduction of surface runoff from study area was evaluated. Estimating surface runoff and storage volume of bioretention is used by Curve Number (CN) method. In this study, storage volume of bioretention is divided by volume of surface runoff and precipitation which enter directely into bioretention. The ratio of captured surface runoff volume by bioretention to storage volume of bioretention is highly influenced by the ratio of drainage area to surface area of bioretention. The high bioretention surface area-to-drainage area ratio could capture much more surface runoff. The ratio of 1.2 captured 51~54% of total surface runoff with ranged from 5-30 cm of bioretion depth whereas 6.2 captured 81~85%. The connecting three bioretentions could capture much more runoff volume showing ranged from 35.8~167.3 m³ than the case of disconnecting three bioretentions at maximum amount of precipitation with non-effluent from the connecting three bioretentions. Therefore, connecting LID-BMPs could improve the removal efficiencies of surface runoff volume and nonpoint source pollution.

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