Análise de Séries Hidrológicas na Bacia Hidrográfica afluente à Usina Hidrelétrica Castro Alves, RS

This study aims to analyze the stationariety and homogeneity of rainfall streamflow series contribution basin Castro Alves Hydroeletric Power Plant, in Southern Brazil. The data were acquired from Agência Nacional de Águas, average was calculated for period 1945 2017. Operador do Sistema Elétrico covering a analysis performed complete two periods obtained same, referring before after 1970. Six statistical tests used check stationarity: t-Student, F-Snedecor, Spearman Correlation Coefficent, Cox-Stuart, Mann-Whitney Mann-Kendall. verification point change total annual precipitations, monthly totals flows using Pettitt’s test. results made it possible conclude that hydrological are non-stationary. prior 1970 characterized as showed significant signs stationarity both variables. Using Pettitt test, trend identified year 1971 precipitations mean flows, respectively. In analyzes series, found increase precipitated more accentuated dry months May November. corroborates pronounced observed those same months.