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      Green roof performance towards management of runoff water quantity and quality: A review

      Ecological Engineering

      Elsevier BV

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          Green roofs as a tool for solving the rainwater runoff problem in the urbanized 21st century?

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            Green roof stormwater retention: effects of roof surface, slope, and media depth.

            Urban areas generate considerably more stormwater runoff than natural areas of the same size due to a greater percentage of impervious surfaces that impede water infiltration. Roof surfaces account for a large portion of this impervious cover. Establishing vegetation on rooftops, known as green roofs, is one method of recovering lost green space that can aid in mitigating stormwater runoff. Two studies were performed using several roof platforms to quantify the effects of various treatments on stormwater retention. The first study used three different roof surface treatments to quantify differences in stormwater retention of a standard commercial roof with gravel ballast, an extensive green roof system without vegetation, and a typical extensive green roof with vegetation. Overall, mean percent rainfall retention ranged from 48.7% (gravel) to 82.8% (vegetated). The second study tested the influence of roof slope (2 and 6.5%) and green roof media depth (2.5, 4.0, and 6.0 cm) on stormwater retention. For all combined rain events, platforms at 2% slope with a 4-cm media depth had the greatest mean retention, 87%, although the difference from the other treatments was minimal. The combination of reduced slope and deeper media clearly reduced the total quantity of runoff. For both studies, vegetated green roof systems not only reduced the amount of stormwater runoff, they also extended its duration over a period of time beyond the actual rain event.
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              Investigation of thermal benefits of rooftop garden in the tropical environment

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                Author and article information

                Journal
                Ecological Engineering
                Ecological Engineering
                Elsevier BV
                09258574
                April 2010
                April 2010
                : 36
                : 4
                : 351-360
                Article
                10.1016/j.ecoleng.2009.12.014
                © 2010

                http://www.elsevier.com/tdm/userlicense/1.0/

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