Green Roof Runoff Impact

In the summer a green roof can typically retain between 70 80 of the run off.

Green roof runoff impact.

Green roofs are unique in that they have the ability to capture and retain a volume depth of rain from each rainstorm. Stormwater response of a green roof is indeed highly impacted by the climate conditions and by the green roof structure itself and this conditions make generalization a very difficult task. Environmental and human health benefits of green roofs include air purification urban heat island amelioration lower building energy costs increased urban biodiversity reduced stormwater runoff and improved stream water quality. Green roofs are lightweight engineered rooftops designed to promote the growth of vegetation while protecting the structural integrity of the roof.

In germany between 40 100 of rainfall can be retained dependent. The technology addresses a wide array of environmental issues associated with urbanization. Green roof runoff does contain concentrations of some nutrients and other parameters but values are in line with other planted systems. Research at penn state has shown that green roofs provide considerable reduction in the volume of stormwater leaving a developed site and they reduce the peak rates of runoff.

In this paper an empirical formulation is compared to a conceptual framework to investigate the stormwater runoff coefficients.