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A piece-by-piece decomposition method was adopted to integrate water quantity and quality in a model that includes economic and hydrologic aspects described in the previous article, titled “ Decision Support in the Management of Water Resources using an Integrated EconomicHydrologic Model for Optimal Water Allocation: An Application in the Pirapama River Basin.” The main factor that compromises water quality in the modeled stretch of Pirapama River Basin is the organic matter used to fertiirrigate sugarcane, an effluent of the main industrial process of agribusiness (vinasse). Furthermore, the greatest concern regarding reservoirs in the stretch is eutrophication. The quality constituents considered were Biochemical Oxygen Demand (BOD) and Dissolved Oxygen (DO). These constituents decay along the river. The results, when quality is taken into account, show a substantial reduction in the total net benefits, especially for industrial use and fertiirrigation. Effluent allocation of one of the distilleries in the sugarcane plantation areas is no longer fully performed due to the impossibility of complying with quality restrictions. This not only implies cost for agribusiness, which will have to treat the remaining organic load, but also lower productivity of the fertirrigated areas, due to the reduction of the fertilized parcels. Effluent allocation depends on the month, since in drier months the depuration capacity of the river is reduced. Benefits are also reduced in the other uses. This shows that the model is considering the dilution of organic loads, restricting water withdrawals so that the river can recover by means of the self-depuration process. Moreover, larger volumes are kept in the reservoirs to avoid future eutrophication. Key-words: Management, river basins.

rbrh

Modelo Econômico-Hidrológico Integrado para Gestão de Bacias Hidrográficas: Abordagem Piece-by-Piece para Incorporar a Capacidade de Autodepuração dos Rios e Limites de Trofia dos Reservatórios