Curva de recessão para o cálculo da reserva reguladora na zona de afloramento do Sistema Aquífero Guarani (SAG) no estado de São Paulo

Abstract

Nowadays, issues related to water are being more and more addressed, because it is necessary to be careful with its use. Thus, several studies have been done to assess water reserves, and many of these studies have focused on evaluating groundwater reserves. These waters have been constantly explored and often in a negligent way, which can cause damage to reserves. In this context, the present work has focused on the study and evaluation of Guarani Aquifer System (GAS) groundwater reserve, in São Paulo state, utilising the recession curve method applied to the basins in study at the upwelling region of the aquifer, verifying the influence of precipitation on its recharge and the value for its regulatory reserve. Pluviometric and fluviometric data were collected and used for years with critical hydric moment and hydric surplus for GAS upwelling basins. The results prove that precipitation directly influences on the restitution of rivers and their regulatory reserves, since for years with hydric surplus results were higher than for years of hydric criticality. Therefore, it is necessary to use water more and more sustainably, so it is not exhausted or impaired.