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Are biocrusts and xerophytic vegetation a viable green roof typology in a Mediterranean climate? A comparison between differently vegetated green roofs in water runoff and water quality
Publication . Rocha, Bernardo; Paço, Teresa; Luz, Ana Catarina; Palha, Paulo; Milliken, Sarah; Kotzen, Benzion; Branquinho, Cristina; Pinho, Pedro; Carvalho, Ricardo Cruz de
Green roofs can be an innovative and effective way of mitigating the environmental impact
of urbanization by providing several important ecosystem services. However, it is known that
the performance of green roofs varies depending on the type of vegetation and, in drier climates,
without resorting to irrigation, these are limited to xerophytic plant species and biocrusts. The aim
of this research was therefore to compare differently vegetated green roofs planted with this type
of vegetation. A particular focus was their ability to hold water during intense stormwater events
and also the quality of the harvested rainwater. Six test beds with different vegetation compositions
were used on the roof of a building in Lisbon. Regarding stormwater retention, the results varied
depending on the composition of the vegetation and the season. As for water quality, almost all the
parameters tested were higher than the Drinking Water Directive from the European Union (EU)
andWord Health Organization (WHO) guidelines for drinking-water quality standards for potable
water. Based on our results, biocrusts and xerophytic vegetation are a viable green roof typology for
slowing runoff during stormwater events
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Fundação para a Ciência e a Tecnologia
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OE
Número da atribuição
72031