Characterization of the Pluviometric Regime of the Municipality >/>of Araguaína – TO

Abstract The behavior of rain affects the planning and operation of society’s sectors. One of the ways to know the behavior of the rains of a certain region is through the analysis of the historical series of precipitation. The objective of this work is to analyze and characterize the pluviometric regime of the municipality of Araguaína, based on the historical series of rainfall stations of the National Water Agency. In addition, regional information is presented that can help the management system of the municipality of Araguaína for the sectors that depend on the dynamics of the rainfall in its decisions. Five rain gauges were selected with contributions from direct rain records in the municipality. In general, it was verified that the hydrological year of Araguaína presents well defined seasonality characterized by two periods: the dry period from May to September, and the rainy season from October to April. The average annual precipitation in the entire area of the municipality is 1746.97 mm and, on average, 89% of Araguaína’s total annual rainfall is recorded on the period considered rainy. On the other hand, a little more than 10% of the volume precipitations happens outside the months of October to April.