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Efficient operation of water resources systems, optimizing water discharges to supply several demands, is very relevant in regions like the Brazilian Northeast, where water is scarce and evaporation is high. This paper presents the development of operation rules for a system with 5 reservoirs used to supply urban and irrigation demands in Acaraú River basin, State of Ceará. The objective is the maximization of the present value of the operational net benefits, subject to reservoir and soil water balance constraints. Some linearization artifices was applied to solve the problem using l inear optimization. Two formulations were considered: 1) constant irrigated area and variable water supply; 2) variable irrigated area and contant water supply. The first formulation derives operation rules to irr igate an optimal area, to be computed. The irrigation may partially supply crop water demands, establishing water stress and productivity decreases. Several functional relationships for operation rules were tested. In the second formulation irrigated area may vary along the t ime, according to the hydrologic conditions. The water supply must be equal to the crop water demand. It was concluded that the system under analysis could irrigate greater areas than the projected one. The two formulations showed that optimization techniques may increase economic eff iciency of regional water resources investments and present relevant informations to optimal sizing and operation of water resources systems.

Otimização de um sistema de múltiplos reservatórios atendendo a múltiplos usos no Nordeste brasileiro