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São Marcos river watershed is located in the state of Paraná, Brazil, between the states of Goiás, Minas Gerais and the Federal District. It presents a relevant hydric conflict between the hydroe-lectric sector (cascade operation of the Batalha hydroelectric plant 52.5 MW of potential and Serra do Facão 210 MW of potential) and the agricultural sector (granted of 65.7 hm/month in 2017). This article aimed to assess the maximum affluent total load of ammonia, nitrate and phosphorus that the dams support and still be framed within the limits defined in the 357:2005 Conama Resolution. The model's calibration in AQUATOOL computational tool, between October 2014 and September 2017, provided a good adjustment between the simulations and the measured data (for the OD, DBO, organic nitrogen, ammonia, nitrate and total phosphorus) in four monitoring positions located in São Marcos River. The scenario has showed a maximum contribution capacity of 4.19, 9.18 e 0.055 ton/km.month of ammonia, nitrate and total phosphorus, respectively, in the contributions sub watersheds in Batalha and of 1.30, 3.34 and 0.019 ton/km.month of ammonia, nitrate and phosphorus in the contributions sub watersheds in Serra do Facão. In general, the study contributed for the planning and management of the soil use and occupation on the watershed.

Modelagem de qualidade da água no rio São Marcos, bacia hidrográfica do alto Paraná