Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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The Effect of Connected Bioretention on Reduction of Surface Runoff in LID Design

LID 설계시 식생체류지간 연결에 의한 강우유출수 저감 효과분석

  • Jeon, Ji-Hong (Department of Environmental Engineering, Andong National University) ;
  • Seo, Seong-Cheol (Aquatic Ecosystem Conservation Department, Environmental Management Corporation) ;
  • Park, Chan-Gi (Department of Rural Construction Engineering, Kongju National University)
  • 전지홍 (국립안동대학교 환경공학과) ;
  • 서성철 (한국환경공단 수생태시설처) ;
  • 박찬기 (국립공주대학교 지역건설공학과)
  • Received : 2016.09.28
  • Accepted : 2016.11.21
  • Published : 2016.11.30
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Abstract

Recently, Low Impact Development (LID) is being used in Korea to control urban runoff and nonpoint source pollution. In this study, we evaluated the reduction of surface runoff from a study area, as the effect of connecting three bioretention as LID-BMP. Surface runoff and storage volume of bioretention is estimated by the Curve Number (CN) method. In this study, the storage volume of bioretention is divided by the volume of surface runoff and precipitation which directly enters the bioretention. The ratio of captured surface runoff volume to storage volume is highly influenced by the ratio of drainage area to surface area of bioretention. The high bioretention surface area-to-drainage area ratio captures more surface runoff. The ratio of 1.2 captures 51~54% of the total surface runoff, ranging from 5-30cm of bioretention depth; a ratio of 6.2 captures 81~85%. Three connected bioretentions could therefore captures much more runoff volume, ranging from $35.8{\sim}167.3m^3$, as compared to three disconnected bioretentions at their maximum amount of precipitation with non-effluent from the connecting three bioretentions. Hence, connecting LID-BMPs could improve the removal efficiencies of surface runoff volume and nonpoint source pollution.

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References

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