Rainwater harvesting is the simple process or technology used to conserve Rainwater by collecting, storing, conveying and purifying of Rainwater that runs off from rooftops, parks, roads, open grounds, etc. for later use.

Advantages

Less cost.
Helps in reducing the water bill.
Decreases the demand for water.
Promotes both water and energy conservation.
Improves the quality and quantity of groundwater.
Does not require a filtration system for landscape irrigation.
This technology is relatively simple, easy to install and operate.
It reduces soil erosion, stormwater runoff, flooding, and pollution of surface water with fertilizers, pesticides, metals and other sediments.
It is an excellent source of water for landscape irrigation with no chemicals and dissolved salts and free from all minerals.