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Strategic water management on a river basin scale requires the inclusion of stakeholders from different sectors and the use of methodologies based on scientifically sound models and techniques, keeping in mind that the power of smaller and larger subgroups of stakeholders should be equal. In this paper, we present an approach to tackle this problem based on two Social Choice Theory (SCT) methods: preferential Borda Count and no-preferential Approval voting method. Two different scenarios of grouping members of the water committee of the San Francisco River Basin in Brazil are simulated, by interested sectors and by interested delegates from the states where the river passes through, five long-term management plans are evaluated and voted in either scenario. Results indicated that if members of the committee demonstrate reasonable competency and consistency while setting their judgments on management plans, the final group decision is the same or similar, regardless the method used. One of the conclusions is also that the voting of small subgroups may have the same power as the voting of a large subgroup in the social choice-based decision-making processes. SCT methods can thus be recommended as an equity framework to empower small groups in selecting long-term water management plans. [ABSTRACT FROM AUTHOR]