Reservas hídricas subterrâneas e contribuição à gestão dos recursos hídricos em aluviões no semiárido

Abstract

Groundwater are strategic sources to improve water supply and to decrease water empty areas. Through the study of an Alluvial Aquifer stretch of the River Curu, we sought to characterize the groundwater reserves to aid in water management of this hydrogeological unit in semiarid regions. Monitoring of water table of 14 shallow wells was performed during the period of one year (May 2014 to May 2015), corresponding to a period of rainfall below the historical average amount for this area. It was observed that even with low levels of precipitation, there was a significant refilling of the alluvial aquifer compared to the recharging of surface reservoirs, once water reserves of the alluvial studied area have the capacity to supply 25% of the annual water demand for irrigation of the entire irrigated perimeter. It was also concluded that for semi-arid regions it is essential to monitor the water level and to calculate the reserves capacity, especially, after each rainy season, performing then the planning and the volume conferment to be exploited from the aquifer, without compromising its environmental function.