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The combined effects of climate change and rapid urbanization inflict a higher risk of flooding in urban areas. Urban storm water runoff results from rain, snow, sleet and other precipitation that lands on surfaces, such as roofs, parking lots, streets, sidewalks, and green infrastructure. Impervious surfaces are recognized as a major problem in many dense urban areas that contribute to the urban storm water runoff. For many cities dealing with sewer overflow problems, storm water runoff reduction, often by 50% or more relative to impervious surfaces, is a crucial service that green living roofs can provide. This review paper presents the important role that the green living roof can play in the dense urban areas regarding the storm water management showing the seasonal trend in green roof hydrologic performance.
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