Green roofing systems such as the one included in the video above can be a cost-effective way to keep water from running into sewer systems and causing overflows, Columbia University researchers have found.
Rainfall Retention
The Con Edison Green Roof, which is home to 21,000 plants on a quarter acre of The Learning Center, retains 30 percent of the rainwater that falls on it. The plants then release the water as vapor, the researchers said in the study (http://www.coned.com/greenroofcolumbia).
Keeping Water Away From Drainage Systems
If New York City’s 1 billion square feet of roofs were transformed into green roofs, it would be possible to keep more than 10 billion gallons of water a year out of the city sewer system, according to the study led by Stuart Gaffin, research scientist at Columbia’s Center for Climate Systems Research.
The study concluded that based on the cost of building and maintaining a green roof it costs as little as 2 cents a year to capture each gallon of water.
For more on this study please visit http://www.environmentalleader.com/2011/05/09/green-roofs-have-positive-effect-on-sewar-systems/#ixzz3DTEwAmDP
For more on Wallbarn’s green roofing systems, please visit – https://www.wallbarn.com/green-roof-new/