As part of a sustainable drainage system strategy, it is essential that we find and implement alternative solutions to preventing localised flooding. In built up areas 95% of the ground surface is sealed. Though we’ve all seen examples of front gardens being concreted over for parking purposes, it is worth noting that roofs represent nearly half of impermeable surfaces in urban areas. This means any excessive amount of rainwater has nowhere to go to apart from our inadequate drainage systems or to the poor souls further down along the watercourse.
How Can Green Roofs Help?
Compared to a conventional roof, an established green roof can reduce total rainwater run off by a significant volume. It is estimated that green roofs will retain up to 80% of rainfall during the summer months and up to 35% during the winter months. The drop off is partially due to less plant growth during the colder months and the fact that there is generally a higher amount of rainfall during the winter months. This of course will vary depending on regional weather patterns, type of vegetation and the particular type of green roofing system.
Summary of green roof benefits
- Green roofs store rainwater in the plants and growing medium.
Continue reading Can Green Roofs Reduce Storm Water Run-off? at SPECIFIER REVIEW.
from SPECIFIER REVIEW http://bit.ly/2UWmNgA
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