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Item Avaliação do volume necessário de descarte de água de chuva escoada sobre coberturas de diferentes materiais(Ricardo Prado Abreu Reis, 2011-06) Rocha, Bárbara Cristina Castro de Melo; Reis, Ricardo Prado Abreu; Araújo, José Vicente Granato deWater scarceness has become a major problem worldwide, which is evidencing to the need for studies of new methods and techniques of water conservation, aiming to produce effective solutions to minimize this problem within building environments. Among the possible water conservation technologies in buildings, rainwater harvesting can be a powerful alternative. The objective of this study is to evaluate the disposal of rainwater collected in three roofs made by different types of materials such as: metal, asbestos cement and clay, located in the area of the School of Civil Engineering at the Federal University of Goiás. After monitoring the volume of discharge correlated with the evaluation of the quality of rainwater collected in each type of roof, and with the rain water collected directly from the atmosphere, the processes were evaluated based on the observed parameters and on the criteria established by the NBR 15.527 (ABNT, 2007). It was observed that the process of disposal of rain water is essential for obtaining water with better quality in these systems. It was also noted that the disposal based on time of rainfall was not sufficient to obtain rainwater with assured quality. Among the evaluated roofs, the metal tile proved to produce the best water quality after discarding the first 150L collected (corresponding to a 2 mm of rainfall over the areas of contribution studied). Moreover, the volume of disposal corresponding to the 2 mm of accumulated rainfall, as suggested by NBR 15.527, were not sufficient to ensure that the rainwater collected can be used without risk to users and water installations, which demands at least a simplified water treatment.