Journal of Wetlands Research (한국습지학회지)

Korean Wetlands Society (한국습지학회)
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Evaluation on the environmental effects of rain garden treating roof stormwater runoff

지붕 강우유출수를 처리하는 빗물정원의 환경적 효과 평가

  • Flores, Precious Eureka D. (Department of Civil and Environmental Engineering, Kongju National University) ;
  • Maniquiz-Redillas, Marla C. (Department of Civil and Environmental Engineering, Kongju National University) ;
  • Kim, Lee-Hyung (Department of Civil and Environmental Engineering, Kongju National University)
  • ;
  • ;
  • 김이형 (공주대학교 건설환경공학부)
  • Received : 2015.12.16
  • Accepted : 2015.12.21
  • Published : 2016.02.29
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Abstract

In this research, the environmental effects of rain garden when applied to a stormwater runoff originated from a rooftop were evaluated. The rain garden that was utilized as LID represents less than 1% of the catchment area that it drains. Storm event monitoring was conducted from March 2012 to August 2014 on a total of 19 storm events. In the 19 storm events that was monitored only 32% produced an outflow which has a mean rainfall characteristic of approximately 25 mm. With the application of rain garden, hydrologic improvement was observed as the facility exhibit a delay and reduction in the production of runoff and peak flows as the rainfall progresses. Furthermore, in terms of pollutant reduction, it was observe that the rain garden showed a generally satisfactory performance in reducing pollutants. In addition to this, the rain garden also has additional attributes that adds to the aesthetic appeal of the surrounding environment as well as in the lives of the people. The findings of this research will help in the further improvement and reinforcement of LID designs.

빗물정원은 강우유출수를 현장에서 관리하는 LID 기술이며 보통 유역면적의 1% 이내의 면적에 적용된다. 본 연구는 지붕 강우유출수를 처리하는 빗물정원의 환경적 효과를 평가하기 위하여 수행되었으며, 강우시 모니터링은 2012년 3월부터 2014년 8월까지 총 19개의 강우사상에 대해 수행되었다. 19개의 강우사상 중에서 빗물정원에 유입된 강우유입수가 유출된 경우는 약 32%로 나타났으며, 이 경우 평균 강우량은 25mm으로 나타났다. 모니터링 결과 빗물정원은 강우시 첨두 유출율을 낮추고 지연시킴으로써 수문학적 물순환 특성을 개선시키는 것으로 나타났다. 또한 빗물정원은 강우량 25mm 이하의 강우유출수의 대부분을 저류 및 침투시킴으로써 지붕에서 유출되는 비점오염물질 저감에 크게 기여하는 것으로 평가되었다. 빗물정원은 물순환 및 비점오염물질 저감과 더불어 경관성을 제공함으로써 시민들의 심미적 효과에 기여하는 것으로 평가되었다. 본 연구에서 수행된 결과는 향후 빗물정원의 설계인자로 활용 가능하다.

Keywords

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