27 Nov '15, 4pm

Designing Green Roofs for #Stormwater Management - https://t.co/enhUQJDqus

The saturated weight of the water retention layers are on average about 25% lighter than typical growing media. In addition, only 9.8 kg/m2 (2 psf) out of the saturated weight of 38.8 kg/m2 (7.9 psf) or 25% by weight, for the lava/pumice/dolomite growing medium is water. In comparison, a high fraction of the saturated weight for the water retention layers comes from the stored water as evident from the high blue fraction compared to the small red fraction in each bar. For example, out of the 24 kg/m2 (4.9 psf) saturated weight of the mineral wool, 23.4 kg/m2 (4.8 psf) or 98% of which is water. It is clear that the water-retention-to-weight ratio for the water retention materials is significantly higher than growing media. Replacing all or part of the growing medium in a green roof with water retention materials such as fleece and hygroscopic mats can achieve equal or bette...

Full article: http://www.greenroofs.com/content/articles/153-Designing-...

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