Green roofs for city streets

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Green roofs are a green infrastructure (GI) option that can be applied to virtually any rooftop given weight load capacity. The benefits of green roofs extend far beyond their obvious aesthetic appeal. They can capture 70 per cent of rainfall over a given time, relieving underground stormwater systems and releasing the rain water back into the atmosphere.
http://www.inkl.com/newsletters/morning-edition/news/how-green-roofs-can-help-cities-sponge-away-excess-stormwater?

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