How does rainwater harvesting structures recharge ground water?

Explanation

Rainwater harvesting is a technique of collecting and storing rainwater for future use. The main purpose of rainwater harvesting is to make the rainwater percolate under the ground, so as to recharge .groundwater level..
Methods of rainwater harvesting
(i) Roof top rainwater harvesting:
The rain water that falls on the roof of the houses, apartments and commercial buildings, etc, is collected and stored in the surface tank and is used for domestic purpose.
(ii) Recharge pit:
The collected rain water is directed into the percolation pits through pipes for filteration. After filteration the rainwater enters the recharge pits or ground wells.
Digging of tanks or lakes (Eris): Eris are constructed in such a way that, if the water in one eri overflows, it automatically gets diverted to the eri of the next village, as these eris are interconnected.
Ooranis:
These are small ponds to collect rainwater. They are used for various domestic purposes.