TELHADOS VERDES: UMA PROPOSTA PARA A SUSTENTABILIDADE

Abstract

Green roofs are being increasingly adopted to provide sustainable urban rainwater management, as a tool to dampen flood peak through runoff storage. An initial, comprehensive literature review is performed reporting the most common green roof design techniques. A practical, mathematically based method is proposed for green roof sizing, starting by adopting a design storm based on the local storm equation, finally yielding the thickness of the permeable layer necessary for the required storage. A hypothesis is adopted that all the infiltrated rain may be retained within this layer and only when it stops will the discharge of stored water start. A realistic case study, based on hypothetical data describing a storm event and the roof layers, demonstrated efficiency on attenuating flow peaks at the roof outlet. A leaflet is proposed to encourage citizens to install green roofs, by highlighting their several advantages.

Index Terms - Green roof, hydrological revitalisation, sustainable drainage, roof sizing, urban development.