Chapter
Apr 26, 2012
Early-Life Roof Runoff Quality: Green vs. Traditional Roofs
Authors: Shirley E. Clark, Ph.D. [email protected], Brett V. Long [email protected], Christina Y. S. Siu [email protected], Julia Spicher [email protected], and Kelly A. Steele [email protected]Author Affiliations
Publication: Low Impact Development for Urban Ecosystem and Habitat Protection
Abstract
Sustainable stormwater management involves ensuring that site runoff not exceed the pre-development peak flow rate and volume, typically accomplished through the use of water retention, infiltration, and reuse onsite through rainwater harvesting. Certain roofing materials, however, may be a pollutant source, thus, influencing the runoff's potential for harvesting. This project focuses on the first four months of roof life for several traditional roofs and an extensive green roof. Substantial and significant releases of zinc and copper originated from an uncoated galvanized roof and from two treated woods, respectively. Roof runoff concentrations during early life indicated potential toxicity concerns for zinc and copper, plus periodic elevated nutrient concentrations. Additionally, periodic spikes in pollutant concentrations in early life indicated that elevated pollutant levels simply were not a result of washoff from excess preservative remaining on the surface of the material at installation.
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© 2009 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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P.E.
Penn State Harrisburg, 777 W. Harrisburg Pike, Middletown, PA 17057. E-mail: [email protected]
GTS Technologies, Inc., 441 Friendship Road, Harrisburg, PA 17111. E-mail: [email protected]
Penn State Harrisburg, 777 W. Harrisburg Pike TL-123, Middletown, PA 17057. E-mail: [email protected]
Greeley and Hansen, Inc., 1818 Market Street, Suite 3400, Philadelphia, PA, 19103. E-mail: [email protected]
Dawood, Inc., 2020 Good Hope Road, Enola, PA. E-mail: [email protected]
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