Estimativa da taxa de recarga da bacia sedimentar do rio do Peixe (PB) pelo método do balanço hídrico.

Abstract

Integrated management of hydrologic basins with respect to the water resources necessitates a rational usage of its surface and ground water resources. Generally, in regions of scarcity of water, the groundwater tends to be over exploited and such practices are unsustainable in the long term. The groundwater explotation will be sustainable onlt if it is closely linked to the recharge of the aquifer. This paper deals with the estimation of annual groundwater recharge in the Rio Peixe river basin located in the semiarid region of the notheast of Brazil. The study uses two methods: (1) the first is the method of Thornthwaite & Mather (1955) to monitor the variation of water storage in the soil layer; (2) as a second a modelo f daily seqüential water balance (BALSEQ) which combines a virtual lysimeter model together with the CN (curve number) method apllied by the uses observed climatological data of the period 2004 – 2007. Sometimes, the results of the method of Thornthwaite &Mather (1955) are not well compatible with the results of the BALSEQ method.