Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Water conservation effect of concave greenroof system and its influential factors

오목형 옥상녹화의 수자원확보효과와 영향인자

  • Baek, So-Young (Department of Civil and Environmental Engineering, Seoul National University) ;
  • Han, Moo-Young (Department of Civil and Environmental Engineering, Seoul National University)
  • 백소영 (서울대학교 건설환경공학부) ;
  • 한무영 (서울대학교 건설환경공학부)
  • Received : 2014.10.15
  • Accepted : 2015.04.14
  • Published : 2015.04.15
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Abstract

Green roofs are gaining much interest in many cities around the world due to its multi-purpose effects of water conservation, flood mitigation and aesthetic benefits. However it may cause additional water demand to maintain green plants, which may intensify the current and future water shortage problems. While ordinary concrete roofs and normal green roof drains off rain water, concave green roof system can retain rain water because of its water holding capability. In this study, the water conservation effect of concave green roof was compared to normal roof on #35 building in Seoul National University, Seoul, Korea. For seven rainfall events the amount of stored rainwater and runoff were measured and proved water conservation effect of the concave green roof system. The concave green roof system of which area is 140m2 showed effect of water conservation from 1.8ton to 7.2ton and the most influence factors on water conservation in green roof are rainfall and antecedent day. If this concave green roof is applied to many buildings in the cities, it is expected as a way to water conservation through rainfall storage.

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References

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