The evolving climate conditions contribute to increase flooding risk in urban areas. Green roofs are effective tools to control and manage stormwater runoff. With the aim to prevent these damaging events, an accurate modelling of the response of green roofs to storm events becomes essential. The goal of this research is to compare the accuracy of two hydrological models in predicting the behavior of two green roof test beds in terms of runoff production. The test beds are located in the campus of University of Salerno, in a typical Mediterranean climate and they differ for the composition of the drainage layer. The selected models are the SWMM model and the Nash model. They have been calibrated against hourly data of twenty-five rainfall-runoff events observed at the experimental site and compared using a number of goodness of fit indices. The Nash cascade model results to be a very simple but effective approach. No substantial differences can be observed in the behavior of the two green roof plots though they differ for the design characteristics. Finally, the existence of a relationship between the errors and the rainfall characteristics has been found.
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