KIEAE Journal

Korea Institute of Ecological Architecture and Environment (한국생태환경건축학회)
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Runoff Reduction Effect of Rainwater Retentive Green roof

저류형 옥상녹화의 우수유출저감에 대한 연구

  • Baek, So-Young (Dept. of Civil and Environmental Engineering, Seoul National Univ.) ;
  • Kim, Hyun-Woo (Dept. of Civil and Environmental Engineering, Seoul National Univ.) ;
  • Kim, Mi-Kyeong (Institute of Construction and Environmental Engineering, Seoul National Univ.) ;
  • Han, Moo-Young (Dept. of Civil and Environmental Engineering, Seoul National Univ.)
  • Received : 2015.11.20
  • Accepted : 2016.02.19
  • Published : 2016.02.29
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Abstract

Purpose: There is a growing interest in rainwater runoff reduction effect of green roof, as flooding caused by increasing impervious surface is becoming more and more frequent in urban areas. This study was conducted to prove runoff reduction and runoff delay effect of the retentive green roof and to investigate its influencing factors to the rainfall events that occurred in the summer of 2013. Method: The experiment intended to monitor the runoff quantity of the retentive green roof($140m^2$) and normal roof($100m^2$) in #35 building in Seoul National University, Seoul, Korea for 75 days in 2013. Result: On analysis of 9 rainfall events, it showed that the retentive green roof has 24.8~100% of runoff reduction ratio, 21.2~100% of peak flow reduction ratio, 0.5~3.75 hours of peak delay, and $1.8{\sim}7.2m^3$ of retaining capacity in an area of $140m^2$. It shows different results depending on rainfall and antecedent dry days. The results show that runoff reduction effect is effective when the rainfall is less than 50 mm and antecedent dry day is longer than five days on average. By installing retentive green roofs on buildings, it can help mitigate urban floods and rehabilitate urban water cycle.

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References

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Cited by

  1. Factors Affecting Runoff Retention Performance of Extensive Green Roofs vol.10, pp.9, 2018, https://doi.org/10.3390/w10091217