Earlier this fall, the American Society of Landscape Architects (ASLA) released performance data for the green roof planted on its Washington, D.C., headquarters. The findings demonstrate a number of environmental benefits, including a significant reduction in storm-water runoff, retaining 27,500 gallons of water, or nearly 75 percent of precipitation, during a 10-month monitoring period.
The results suggest that widespread implementation of green roofs and other sustainable site development practices could be a viable storm-water-management option, particularly in cities with older, and overburdened, combined sanitary and wastewater transportation systems. “Collectively, green roofs could save billions of dollars in urban infrastructure costs,” says Nancy Somerville, the society’s C.E.O.
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