O aquífero fraturado cristalino em um setor do agreste paraibano.

Abstract

In the State of Paraíbathe semi-arid climate and the geology of igneous and metamorphic rocks dominate, imposes serous limitations concerning thestorage ofgroundwater. This work aimed to evaluate the fractured aquifer in Agreste Paraibanoenvironment. This region stands out from the regional context of scarcityand plays an important role in the supply of water in periods without rain. This work evaluated 180 wells located in the fractured aquifer, encompassing 9 municipalities. All the studied well was from the Groundwater Information System (SIAGAS) database of Geological Service of Brazil (CPRM). The lithological, flow and salinity data of the waters were integrated with information on rainfall, vegetation cover and topography. In the central portion of the area (Alagoa Nova, Areia and Pilões) the greater productivity of the wells is accompanied by predominantly sweet waters. This scenario is possibly due to the higher incidence of rainfall in the sector and the presence of a thicker mantle of weathering, associated with the presence of the sedimentary rocks of the Serra dos Martins Formation.