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The present study deals with the development of an economic optimisation method for water supply systems, formed by the water distribution network together with the pumping station. The method takes into account the varia- tion of project boundary conditions during the time in which it is used. Flow variations, roughness of pipe walls and energy unitary cost are considered during the period of project exploitation. The method is based on a non-linear mathematical pro- gramming model, in order to obtain the minimum total cost of the pipe network/pumping station, taking into account the operational parameters variation over time. The opti- mum design solution was obtained by the algorithm of the Generalized Reduced Gradients (GRG2). The method was applied to the optimum water supply sys- tem design of the city of Itororo in the state of Bahia, Bra- zil. The design solutions obtained show that all the hydrau- lic restrictions had been taken into account. Despite the robustness of the optimisation model, with the variation of flows, head loss and energy unitary cost over time, the method proved to be practicable

Dimensionamento Econômico de Sistemas de Distribuição de Água, Considerando Variáveis as Condições de Contorno do Projeto