Aplicação de protótipo de telhado verde para a avaliação do escoamento superficial e aproveitamento da água para fins não potáveis

Abstract

Due to the great urban expansion in Brazil, the areas of vegetation are being removed for the construction of roads, buildings, industries among others. This ends up decreasing the permeable areas in the cities, which can make them more vulnerable to flooding, especially in periods of intense rains. A sustainable alternative for the mitigation of the impacts caused by the waterproofing of the soils, is the implementation of green roofs. This technique, beyond acting in the cushioning of rainwater flow, can better the thermal comfort in the place, reduce noise pollution, retain atmospheric pollutants, among other benefits. Therefore, the objective of this work was to evaluate the rainwater retention efficiency of a green roof prototype, comparing it with a conventional roof prototype, both located in Cerro Largo - RS. Besides that, were analyzed in the laboratory of the UFFS, some parameters of quality of the water drained in the prototypes, to evaluate the possible non-potable reuse of these waters. 16 rainy events were monitored between September 17 and November 4, 2018. The rainfall data were obtained through the meteorological station located on the UFFS campus of Cerro Largo. The retention capacity of the green roof was satisfactory, with an average value of 51% rainwater runoff.