Answer:

Rainwater harvesting (RWH) is the collection and storage of rain, rather than allowing it to run off.  Rainwater harvesting differs from storm water harvesting as the runoff is collected from roofs, rather than creeks, drains, roads or any other land surfaces. 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.

Rainwater harvesting systems consists of the following components:

Catchment- Used to collect and store the captured Rainwater.

Conveyance system – It is used to transport the harvested water from the catchment to the recharge zone.

FLUSH- It is used to flush out the FIRST spell of rain.

Filter – Used for filtering the collected Rainwater and remove pollutants.

Tanks and the recharge structures: Used to store the filtered water which is ready to use.

The benefits of rainwater harvesting system are listed below.

Less cost.

Helps in reducing the water bill.

Decreases the demand for water.

Reduces the need for imported 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.