Analyzing the impact of agricultural water-demand management on water availability in the Urubu River basin – Tocantins, Brazil

The Urubu River is part of the Formoso Basin located in Tocantins State northern Brazil. It an important agricultural region where irrigation has role rice and soybean crops, cultivated during rainy dry seasons, respectively. high levels associated with below-average precipitation 2016 following years resulted a water crisis Basin, serious consequences to environment economy region. This work evaluated impact reducing on environmental flows using hydrological modeling WEAP. Irrigation demand scenarios were simulated analyzed from July 2018 through June 2019. Results indicated need reduce 35% all withdrawls order avoid interruption flow Basin. percentage was even greater when only some farmers cooperated. paper emphasized that it be involved cooperate their withdrawal by any means, including improving system efficiency. regulator may also motivate reduction modifying permits applying restrictions season.
 Keywords: modeling, scenario analysis, balance.