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Water 2018, 10(9), 1217; https://doi.org/10.3390/w10091217

Factors Affecting Runoff Retention Performance of Extensive Green Roofs

1
Key Laboratory of Urban Stormwater System and Water Environment, Ministry of Education, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
2
Department of Civil Engineering, Auburn University, Auburn, AL 36849-5337, USA
3
Beijing Cooperative Innovation Research Center on Architectural Energy Saving and Emission Reduction, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
4
Beijing Advanced Innovation Center for Future Urban Design, Beijing 100044, China
*
Author to whom correspondence should be addressed.
Received: 8 August 2018 / Revised: 31 August 2018 / Accepted: 4 September 2018 / Published: 10 September 2018
(This article belongs to the Section Urban Water Management)
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Abstract

The runoff retention effectiveness of 10 extensive green roof (EGR) modules (100 mm substrate planted Sedum lineare Thunb.) were analyzed in Beijing for 22 rainfall events (2.4–46.4 mm) from 1 July to 30 September 2017. Differences between minimum inter-event dry periods, module scales, substrate hydraulic conductivity and depths, drainage layer types and rainfall characteristics were examined to study their correlation to the retention performance of EGRs. In general, EGRs with lower substrate hydraulic conductivity, deeper substrate and lower rainfall depth had higher runoff retention performance. By comparsion, no siginificant correlation was found between rainfall duration, prior dry period, average rainfall intensity, drainage layer type and EGR runoff retention rate. Analyses of variance (ANOVA) and Tukey tests supported these results. Low or moderate rainfall (<15 mm) may or may not have an effect, but heavy rainfall (>25 mm) definitely affects the EGR retention performance of the next rainfall event. View Full-Text
Keywords: extensive green roof (EGR); runoff retention rate (R3); minimum inter-event dry period (MIDP); influencing factors; rainfall characteristics extensive green roof (EGR); runoff retention rate (R3); minimum inter-event dry period (MIDP); influencing factors; rainfall characteristics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Gong, Y.; Yin, D.; Fang, X.; Li, J. Factors Affecting Runoff Retention Performance of Extensive Green Roofs. Water 2018, 10, 1217.

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