This study aimed to identify the variability of the Tocantins river in Maraba region in the period 1971-2013, through analysis of hydro and graphs generated from the same data. Analyze the behavior of the river is of fundamental importance to know whether climate changes are interfering with the hydrological regime of the region and causing or environmental impacts. Understanding the behavior of the river and the precipitation regime in the region of Maraba, so we know which periods of flood and drought. And this information is fundamental to the defense of civil actions. What does the hydrological monitoring in the region, and actions to prevent flooding.Local agriculture also benefits from this information, since they can be set with the best period for planting. Avoiding economic loss due to flooding of farmland. It was observed a different behavior from one year to the next, each with a peculiar behavior, this is because the mechanisms that favor the rain in the basin region is more or less intense. .and the abnormal behavior of the Tocantins river gaging levels may be related to the ENSO phenomenon, since the rainfall pattern of rainfall is altered by the change in the pattern of atmospheric circulation.
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