This research takes place in Santa Isabel of the Pará was assessed self-purification of the namesake creek through mathematical modeling proposed by Streeter-Phelps (1925). For this, during the period October 2009 to September 2010, we analyzed the physical and chemical parameters DO and BOD and certain hydraulic variables at 11 sampling points, divided into four sections of the watercourse. The result of the modeling indicated that the parts 1 and 2 have low self-purification in, they do not obey the standards of the legislation CONAMA 357/05. Finally, it is noteworthy that, in addition to unfavorable resilience that has Igarapé Santa Isabel, there is an effective action of the bodies responsible for monitoring the environmental quality of water resources so that there is control of the quantity of pollutants discharged into the creek. This way you can avoid that in a future scenario, serious problems due to multiple use of water from this source, compromising the health and well being of people dependent Igarapé Santa Isabel.
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