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Water supply and quality is becoming a common problem in many river basins located in rapidly developing countries. Dealing with the human water supply of cities located in these basins requires sophisticated water planning processes. The increase in population and industry in the city of Uberlandia (Minas Gerais) has generated private and collective conflicts of interest in the multiple use of water in the Uberabinha River, thus requiring integrated management of quantity and quality. This paper explains the development of decision support system AQUATOOL in the Uberabinha River Basin for water planning and management including water quantity and quality modeling. The quantitative part consists of hydrological rain-flow modeling and a subsequent water management model developed with the SIMGES module for the period from October 2006 to September 2011. The water quality model was performed using the GESCAL module that is connected with the SIMGES module. The parameters studied were dissolved oxygen, biochemical oxygen demand, organic nitrogen, ammonia, nitrate and total phosphorus. The future scenarios simulated show the need to choose new locations, outside the Uberabinha river basin, for the abstraction of water used in public water supply in Uberlândia. The disagreement with the DN COPAMCERH 01:2008 regarding biochemical oxygen demand and total phosphorus, in the months with less rain also shows the need to choose new locations to discharge additional pollution loads coming from the main wastewater treatment plant of the city. Key-words: Water quantity and quality modeling, Decision support system AQUATOOL, SIMGES module, GESCAL module, Uberabinha river.

Sistema de Suporte à Decisão em Recursos Hídricos na Bacia Hidrográfica do Rio Uberabinha, Minas Gerais