The bottom of this saturated zone is impenetrable rock. Water table level within an area vary between seasons. In summer, water table drops due to less precipitation seeping into the ground due to lack of rain, and also due to trees using up the water in surface soil before it reaches the water table. In rainy season, water table rises. Water table can permanently drop due to overexploitation of groundwater. It is imperative that groundwater recharging is done for sustainable use of ground water.