Spaceborne InSAR cannot be use for precise estimation of depth and thickness of various subsurface layers and their relative water yielding capacity or to estimate ground water available resources. The SAR signal in the C-band (5.6cm) cannot penetrate the surface for more than a few cm when the soil layer is dry and compose of lossy material. Spaceborne InSAR can be used to predict and monitor the consequence of aquifer depletion such as land subsidence.