Hydrological Analysis of Green Roofs Performance under a Mediterranean Climate: A Case Study in Lisbon, Portugal

In this paper, the hydrological performance of eight pilot green roofs (GR) installed in Lisbon, Portugal, under a Mediterranean climate is analyzed. The units were at Instituto Superior Técnico campus Lisbon University. pilots present different plant species and substrate types, with some incorporating recycled construction demolition waste (RCW). pilots’ hydrologic was evaluated through simulation artificial precipitation events between March 2021 July 2021. Considering results obtained, it can be concluded that inclusion RCW composition did not hinder development vegetation or GR. showed rainfall water retention per event ranging from 37% to 100%, an average about 81%. runoff delay ranged 2 18 min, peak attenuation 30 100%. indicated previous moisture strongly influences As promotes more effective drainage during dry conditions, considered may have positive impacts on GR’s performance.