Water quality modeling is applied as a supporting tool for water quality management. It is useful in identifying environmental impacts from pollutants discharged into rivers and in predicting self-depuration capacity. This study aimed to simulate the water quality along a stretch in São Joaquim stream basin, in order to identify the main polluting sources in the stream and to propose measures to control pollution. The mathematical model, based on the mass balance in plug flow reactor, was implemented in an electronic spreadsheet. The modeling process involved the following stages: collecting the input data, calibration, sensitivity analysis, uncertainty analysis, and the generation of the scenarios. The calibration of the model has generated r2 above 0.68, and it was the indication that the model can explain most of the variance found in the measured data. The wastewater and the stream flow were considered the most sensitive parameters in the model. The uncertainty analysis has shown the probability of the dissolved-oxygen to be higher than or equal to 2 mg L-1, the minimum value allowed for the class 4, is 5.3 %. The main pollution sources in stream are the discharge of untreated domestic wastewater from São Joaquim City, and the surface runoff from the agricultural area. The study has shown that a wastewater treatment station must installed in the basin, in order to remove at least 93% of the organic matter currently discharged in the stream.
Aos meus pais, Luis Alberto Esposto e Marcia Helena Senhuki Esposto, por terem apoiado mais uma etapa de minha vida e por continuarem acreditando no meu potencial muito mais do que eu mesmo sou capaz de acreditar. Ao meu irmão, Mateus Senhuki Esposto, por tirar dúvidas escolares comigo e me mostrar que ainda posso ser feliz na docência. A minha melhor amiga, Mariele Fernandes de Oliveira, pelo carinho, torcida e disposição para ouvir meus desabafos. Aos meus amigos de longa data, Leonardo Dias, José Vitor, Rafael Fares, Carlos Eduardo, Lucas Lombardi, Igor Aurélio, Carolina Oliveria e Stela Kaori, por serem o combustível que me alimenta todas as vezes que visito São Joaquim da Barra. A minha amiga Cristina Rebello, pelas conversas geniais e igualmente divertidas que me proporciona, pelas quais me sinto tão presente, mesmo estando tão distante.
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