The idea of constructed wet roofs CWR is to connect (extensive) green roofs and constructed wetlands for domestic wastewater (so-called grey water) treatment. Besides, constructed wet roofs retain storm water for a certain period of time, gradually releasing rainwater and reducing the overall runoff. Furthermore, CWRs have positive impacts on the microclimate. Constructed wet roofs consists of precultured mats with evergreen vegetation that are installed on rooftops. The plants are irrigated with storm- and wastewater to ensure the surface layer remains moist. Water impurities are filtered during their way through the vegetation layer and absorbed as plant nutrients. Roofs need to have a moderate to high slope gradient to enable the water runoff. The processed water is used for irrigation as well as for disposal into receiving water or for toilet flushing. Besides the wastewater maintains the green space on the rooftop.
*different term for constructed wet roofs used in literature is wetland roofs (source: http://rhizotech.com/de/107/dachbegruenung)
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