O uso da ferramenta CALPOHID e de valores diferentes de recarga na avaliação do comprometimento e do potencial hídrico subterrâneo de bacias hidrográficas

The estimation of groundwater potential and its commitment are necessary to assist in the selection of measures for the sustainable use of the aquifer. Such information becomes even more relevant in areas with greater density of wells and inserted in fractured aquifer systems. This is the case of the study area, which is inserted in the Taquari-Antas hydrographic basin, where the Serra Geral Aquifer System (SASG) occurs. The aim of this study was to analyze the variation in the volume of groundwater potential (Po) and its impairment (C), in view of 5 methods of recharge estimation: 2 variations of water balance methods and 3 methods based on surface water. For this, a Po and C calculation tool, called CALPOHID, was developed in which 5 potential scenarios were simulated, considering 15, 20, 25, 50 and 100% of the recharge, and 3 scenarios of installed hydric availability (Di), considering the average pumping times of 18 and 24h. In most cases, there were significant differences between the methods capable of meeting at least 42% of the Di value in its most critical scenario. However, such differences only resulted in variations in the degree of impairment for the potential scenarios of 15, 20 and 25% of the recharge. Therefore, the water balance method (BH1) was the one that resulted in the smallest differences in relation to the other methods, providing a weighted result between the 5 simulated methods. The CALPOHID tool proved to be efficient for comparing potential and commitment scenarios in the view of different recharge and Di data.