کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6409226 | 1629911 | 2016 | 10 صفحه PDF | دانلود رایگان |
- Retention performance of green roofs in three different climates is examined.
- Drier climates retained a greater percentage of precipitation.
- The retention performance of green roofs is dependent on antecedent soil moisture.
- Retention performance during large events (>45Â mm) was evaluated.
Green roofs are becoming increasingly popular for moderating stormwater runoff in urban areas. This study investigated the impact different climates have on the retention performance of identical green roofs installed in London Ontario (humid continental), Calgary Alberta (semi-arid, continental), and Halifax Nova Scotia (humid, maritime). Drier climates were found to have greater percent cumulative stormwater retention with Calgary (67%) having significantly better percent retention than both London (48%) and Halifax (34%). However, over the same study period the green roof in London retained the greatest depth of stormwater (598Â mm), followed by the green roof in Halifax (471Â mm) and then Calgary (411Â mm). The impact of climate was largest for medium sized storms where the antecedent moisture condition (AMC) at the beginning of a rainfall event governs retention performance. Importantly AMC was a very good predictor of stormwater retention, with similar retention at all three sites for a given AMC, emphasizing that AMC is a relevant indicator of retention performance in any climate. For large rainfall events (i.e., >45Â mm) green roof average retention ranged between 16% and 29% in all cities. Overall, drier climates have superior retention due to lower AMC in the media. However, moderate and wet climates still provide substantial total volume reduction benefits.
Graphical Abstract117
Journal: Journal of Hydrology - Volume 542, November 2016, Pages 115-124