The Rio Formoso River Basin is characterized by the strong role it plays in the agricultural
production of grain in Tocantins state, with 97% of water use grants destiny to irrigation
activities. As a result of drought periods characteristic of Tocantins state, there is an
increased hydrological demand for crop irrigation while the availability of basin is reduced.
This situation becomes critical once the existent public policies aren’t able to prevent the
degradation of the rivers, as occurred in 2016 at Formoso’s river and Urubu’s river. Then,
it is necessary to develop tools that allow the more efficient public policies execution.
Given this scenario, in this work has elaborated a Decision Support System, called Water
Balance, that evaluates the quality of water grants through by use of fuzzy inference
and shows a granted flow balanced scenario, allowing managers, in conflict situation by
hydrological resources, make agreements between water users so that the reduction of
captured flow has impartially distributed, considering previously agreement criteria.
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