Rain Water Harvesting – Process – Uses

What is Rain Water Harvesting?
Rain water harvesting is a process of collecting and storing rain water and diverting it back to earth for future use.

Why is it so important?

  • To meet water demands for domestic use
  • Augments the ground storage
  • Reduces sea water intrusion
  • Increases quality of ground water
  • Reduces soil erosion and improves moisture content of soil;

How is it done?
Rainwater can be harvested in two methods
(a) Roof top rainwater harvesting: It is a system of catching rainwater where it falls, and storing in containers and tanks so that it can be used when needed.
(b) Ground water recharging: Water flowing along the ground during the rains will be collected for recharging ground water.

Roof Top Rainwater Harvesting
Rainwater from the roof is collected through gutters in the roof and sent to the sand filter. The filtered water is collected either in the storage tank or existing sump for future use.

Using open wells
Rain water collected from the roof top of the building is diverted through storm water pipe to filtration bed and to open well to recharge deep aquifers.

Using Recharge Pits
These pits are suitable for small houses and recharging shallow aquifers. It helps in reducing flood hazards and is ideal when ground water supply is inadequate.

Using Trench
It is a trench excavated on the ground. This method is suitable for small houses, play grounds, parks, and road side drains.

Using Bore Wells
Rain water collected from the roof top of the building is diverted through storm water pipe to filtration bed and to bore well to recharge deep aquifers.

 

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