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Runoff detention effect of a sedum green-roof.
- Source :
-
Nordic Hydrology . 2007, Vol. 38 Issue 1, p99-105. 7p. - Publication Year :
- 2007
-
Abstract
- In order to estimate the detention effect (storage and peak flow attenuation) of a sedum green-roof, a comparison between the response of an impervious roof (runoff coefficient C = 1) and a green-roof has been carried out. Precipitation and runoff data from several controlled experiments (with wet initial conditions, i.e. approximately at field capacity) on a sedum green-roof were used for the analysis. For events with variable rain intensity, the green-roof's attenuation effect was as high as 65% for design storms. In contrast, events with constant intensity had increases in peak flows of up to 5%. The lowest detention volumes were observed for the experiments with constant rain intensity, for which a maximum of 29% of the rain volume was detained, whereas for rain events with variable intensity the detention volume was up to 52%. Simulations (using PondPack), based on a real case study, showed that green-roofs can be implemented in combination with other structural best management practices (BMPs) to obtain a desired detention. They can be used to reduce the size of other structural BMPs, and can occupy unused space that is readily available. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00291277
- Volume :
- 38
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Nordic Hydrology
- Publication Type :
- Academic Journal
- Accession number :
- 25350904
- Full Text :
- https://doi.org/10.2166/nh.2007.031