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O presente estudo teve como objetivo analisar e diagnosticar a qualidade das aguas do corrego Sucuri, localizado no municipio de Cacu-Goias. Para tanto, delimitou-se como area de estudo a bacia do corrego Sucuri, que esta inserida na bacia do reservatorio da Usina Hidreletrica Barra dos Coqueiro. Foram definidos cinco pontos de amostragem no curso d'agua e as coletas foram realizadas em quatros periodos distintos. Parâmetros analisados: potencial Hidrogenionico (pH), oxigenio dissolvido (OD), demanda bioquimica de oxigenio (DBO), temperatura da agua (T), condutividade eletrica (CE), total de solidos dissolvidos (TSD), salinidade (NaCl), coliformes termotolerantes (CT) e fosforo total (P). A metodologia de analise da agua seguiu a proposta do Standard Methods for the Examination of Water and Wastewater e Resolucao CONAMA (2005). De acordo com os dados avaliados, a nao conformidade da agua do corrego Sucuri para classe 1 e afetada pela CE, P e CT, sendo esse curso d'agua classificado como de classes 2 e 3. Ha correlacoes muito fortes entre os parâmetros TSD x NaCl = 0,9994, CE x NaCl = 0,9997 e CE x TSD =0,9999 e estao relacionadas as caracteristicas fisica e geologicas da bacia e tipos de solo. A B S T R A C T The purpose of this study is to analyze and to evaluate the water quality of Sucuri stream, located in the municipality of Cacu-Goias. For this purpose, it was established Sucuri stream basin, which is located in the reservoir basin of Barra dos Coqueiros Hydroelectric Power Plant, which was delimited as the study area. It was determined five sampling points in the watercourse, and the collections were carried out in four different periods. The parameters that were studied are: (DBO), water temperature (T), electrical conductivity (CE), total dissolved solids (TSD), salinity (NaCl), thermotolerant coliforms (CT) and total phosphorus (P). The methodology of water analysis followed the proposal of the Standard Methods for the Examination of Water and Wastewater and Resolution CONAMA (2005). According to the data, the non-conformance of the water of the Sucuri stream to class 1 is affected by the CE, P and CT, being this watercourse classified as class 2 and 3. There are very strong that the correlations between the parameters TSD, CE And NaCl are related to the physical and geological characteristics of the basin and soil types . Keywords: hydrographic basin, limnology, CONAMA resolution 357/2005.

Diagnóstico da qualidade das águas do córrego Sucuri (Caçu-Goiás) (Diagnostic of the water quality of the stream Sucuri