Cenários de disponibilidade hídrica para concessão de outorga: estudo de caso da Bacia Vertentes do Rio Grande, Estados de Minas Gerais e São Paulo, Brasil

Abstract

The State Water Resources Policy aims to ensure the control, for current and future users, of water use and its use in quantity, quality and satisfactory regime. As only part of the minimum reference flows are granted, there is a limitation of water use, especially in periods of greater water availability, affecting different users and their economic activities. Thus, it is necessary to analyze the influence of the seasonality of the flows in the criteria of granting water use. In this context, the present study was carried out with the objective of evaluating the regionalization of seasonal flow, in the most diverse reference flows, verifying the possibility of the increase in water availability for the different UPGRH-GD2 users. In order to carry out this study, the software SisCah 1.0 and SisCorv 1.0 were used, selecting the fluviometric stations of the region that presented data related to the period from 1967 to 2002, as well as the analysis of the granting database of the Minas Gerais Institute of Management Waters (IGAM). The results obtained allowed to conclude that the use of the criteria based on the seasonal water behavior facilitates flexibility in the flow rates in the rainy season of the year, for the reference flows Q7,10, Q90% and Q95% and restriction on the use, during the dry season, for the reference flows Q90% and Q95%.