The process by which rain water is collected and stored either to recharge the ground water or for use in the future is known as rainwater harvesting. The method or setup used for rainwater harvesting is known as rainwater harvesting system.
The rainwater on the roofs of the buildings is collected through canals that drain the water into ground reservoirs. This stored water is later utilized.
They recharge the ground water.
They can be used for drinking and other domestic purpose.
Water can be used throughout the year.
Reduce storm water discharges, urban floods and overloading of sewage treatment plants.
Reduce seawater ingress in coastal areas.
They act as water for irrigation.