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The control and reduction of losses from networks are complex activities. A major deficiency is the lack of necessary diagnostics on its causes, so that obtaining a good diagnostic method is of fundamental importance. This study evaluates and compares three methodologies for estimating water losses from components of a supply sector, with particular attention to physical losses, using methods based on water balance, the model EPANET, and the empirical method “FND - Night-Day Factor”. It was found that model EPANET performed well in estimating leakage losses and demands, and its results agreed with those obtained by the method FND and the Annual Water Balance method, showing that it an important tool for making decisions concerning how to reduce water losses, particularly from active leakage and unauthorized use

Estudo de Metodologias para Determinação das Perdas Físicas em Redes de Distribuição de Água