Landscape Architects' Green Roof Kept Runoff Out of DC Sewers
Environment News Service 9/21/07
"In July 2006, The American Society of Landscape Architects, ASLA replaced the conventional roof on its downtown Washington, DC headquarters with a green roof, and in the process installed equipment to gather data on stormwater runoff, water quality, and temperature.
When the figures were tallied in May, the new green roof was found to have retained thousands of gallons of stormwater, reduced building energy costs by hundreds of dollars a month, and lowered outdoor air temperature.
An ASLA report released Thursday shows that between July 2006 and May 200, ASLA's green roof prevented 27,500 gallons of stormwater - nearly 75 percent of all precipitation on the roof - from flowing into the Capital District's overburdened sewer and stormwater system."
The full briefing report, the comprehensive water monitoring report and detailed planting information is online at www.asla.org/greenroof. MORE...
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