The inherent non-uniqueness of solution is one of the major difficulty faced in dealing with the inverse problem. Much of the data entered into the inverse modeling technique represent imprecise measurements and processed information that give a distorted picture of the system's true state. The calculation of recharge of an aquifer by the inverse modeling technique must be regarded with caution, if the true 'S' (Storage coefficient) values of the aquifer are not known. If, however, the calibrated S values can be regarded as being very close to the real values, this technique can be of much use in describing the behaviour of the aquifer to the recharge phenomena in general.