i. It is a technique of increasing the recharge of ground water by capturing and storing rainwater. ii. Roof top rainwater harvesting was commonly practiced to store drinking water particularly in Rajasthan. iii. In the flood plain of Bengal, people developed inundation channels to irrigate their fields. iv. In arid and semi arid regions of Rajasthan agricultural fields were converted into rain fed storage structures that allowed the water to stand and moisten the soil.