Explain rain water harvesting.

Rainwater harvesting refers to collection and storage of rainwater before it is lost as surface runoff.

Various methods of rain water harvesting are as follows

● Surface runoff harvesting- Rainwater that flows off from surface is collected and used to recharge aquifers.

● Roof top rainwater harvesting- Roof acts as a catchment where the rainwater is collected. This collected water is stored in a tank or diverted to artificial recharge system.