About 1,050 mm/year or approximately 88 mm/month of rain falls on the entire surface of our planet.

1. Rainwater Harvesting | Greensutra | IndiaWhat is Rainwater Harvesting?

Rainwater Harvesting is the activity involving collection of rain water for purposes of direct use, indirect use, storage, recharging of ground water levels, etc.

2. What are the advantages and disadvantages of Rainwater Harvesting?

Rainwater Harvesting is one of the simplest and oldest methods of self-supply water for domestic purposes. Like everything else, harvesting rainwater comes with its share of advantages and disadvantages.


  1. Flexible System : One of the beauty of these systems is their flexibility. It can be as simple as placing a tank/barrel under the rain gutter for purposes like watering the plants, cleaning, etc or it can be complex engineered, multi-filter, multi-tank system for residential and commercial supply.
  2. Easy Maintenance : Maintenance for these systems require little time and energy.
  3. Multi Purpose : Rainwater can be  used for various things from flushing toilets, to washing clothes, cars, etc.
  4. Reduced Floods & Soil Erosion : Collecting rainwater, prevents it from reaching the ground. It is possible to prevent flooding if carried out on a large enough scale. In many low lying areas, it helps reduce soil erosion by preventing surface run-offs.
  5. Reduced Water Bills : Collected rainwater can substitute for several domestic purposes by families and businesses. This may lead to a significant reduction in utility bills.
  6. Helps Preventing Water Contamination / Pollution : Non harvested rainwater flows freely and rejoins a larger water body. While freely flowing, it carries with it multiple impurities and toxins which then contaminate the larger water body. Such instances can be easily prevented by Rainwater Harvesting.


  1. Initial Setup Cost : Determining the best system configuration and getting it set up is not always budget friendly.
  2. Unpredictable Nature of Rainfall : Prediction of rainfall is not an exact science yet. This can limit the supply of rainwater.
  3. Storage Limitations : Rainwater collection and storage systems are fairly limited and restrictive.

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