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Green Roofs for Stormwater Management
Berghage, R. AND T. OCONNOR. Green Roofs for Stormwater Management. Presented at EPA Science Forum, Washington, DC, May 20 - 22, 2008.
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This project evaluated green roofs as a stormwater management tool. Results indicate that the green roofs are capable of removing 40% of the annual rainfall volume from a roof through retention and evapotranspiration. Rainfall not retained by green roofs is detained, effectively increasing the time to peak, and slowing peak flows for a watershed. Green roof runoff does contain concentration of some nutrients and other parameters, but values are in line with other planted systems.