Estimation and Comparison of Groundwater Potential in Taquari-Antas Basin (RS)

Abstract

The basin plan is one of the instruments of the national water policy, and has the watershed as its territorial base. The Taquari-Antas basin plan estimated a recharge of 8% of the average annual precipitation for the same, with the groundwater potential (Po) equal to 25% of this value. To assess the influence of what has been defined in the basin plan for the entire watershed, in smaller areas that make up the referred basin (management unit, sub-basins and cities), a study was developed, whose results are presented in this article. For this, areas of the basin were selected, the recharge was calculated using the water balance method and the groundwater potential was defined for the 25% recharge scenario, as well as the installed water availabilities for the following scenarios of pumping time: projected, from 18h and 24h. The results indicated that the values of groundwater potential, from the estimated recharge in the basin plan, were on average, 45% lower than those obtained in local studies, resulting in levels of critical impairment, in most of the areas studied, for the installed water availabilities scenarios of 18 and 24 hours. The observed differences among the groundwater potentials can and will influence the social and economic development of the region.

Keywords

• Disponibilidade Hídrica Instalada. Comprometimento do Potencial. Gestão das Águas Subterrâneas.