Recharging Conditions and Ages of the Underground Water in the Valley of Bekaa (Lebanon)

The recharging's water of the aquifers is old and recent, but regarding the chemical facies of the aquifers (carbonated formations), it is very difficult to estimate the real ages of these waters without the use of a correcting's model of the ages after an intervention of the carbonated matrix in the mineralization of waters and in consequence in the activity of the Carbon-14 of the water (dissolution of the carbonated matrix formation with A14C (Activity of the Carbon-14) = 0%). In the Anti-Lebanon, the Cenomanian's waters are older than the Jurassic's waters; in consequence, the rate of renewal of the Jurassic's groundwater is greater than the Cenomanian one.