Two different solutions comprised of vegetated (green) and non-vegetated (grey) configurations were evaluated with respect to their hydrological performance between years 20. Moreover, in climates with limited evapotranspiration, a non-vegetated configuration may be a more favourable option for stormwater management.Ī field station for testing different rooftops was established in 2017 on the coast of Trondheim, Norway. ![]() However, they do not always fulfil the requirements for stormwater detention. Vegetated rooftops may contribute to reducing the impact of climate change and urbanization by retaining and detaining runoff, thereby reducing overall runoff volume and peak runoff rates. A considerable portion of urban impervious fractions is comprised of rooftops, which have increasingly been retrofitted with green roofs. The combined effect of urbanization and climate change, which results in an increased level of imperviousness, is currently causing stress to urban drainage systems in urban areas unable to preserve the hydrological cycle of natural catchments.
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