Green roofs = Cost-effective means of preventing sewer system overflows
The ability to stop overflows of course stems from the fact that green roofs retain water and thus prevent said water from simply flowing into the sewers. As an example, the green roof on top of the Con Edison building in Long Island City, Queens, New York (investigated by the researchers) — home to around 21,000 plants — retains roughly 30 percent of the rainwater (on a quarter acre) that falls on it.
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