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Discuss rain water harvesting. What are advantages from this techniques?
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As our world faces serious water shortages, every drop of water we can use efficiently becomes of great value. One method is to manage rain water in such a way that it is used at the source. If as much water as possible is collected and stored, this can be used after the rainy season is over. In many parts of the world, especially, in very dry areas, this has been traditionally practiced.

 

However, the stored water has to be kept pollution free and clean so that it can be used as drinking water. Stored water can grow algae and zooplankton (microscopic animals). This can be pathogenic and cause infections. Thus keeping the water uncontaminated is of great importance.

 

Current technologies of rainwater harvesting require that all roof and terrace water passes down into a covered tank where it can be stored for use after the monsoon. This is most advantageous in arid areas where clean water is very scarce. However, there are practical difficulties such as constructing large storage tanks which are expensive.

 

Another way of using rooftop rainwater harvesting is to collect it so that it percolates into the ground to recharge wells instead of flowing over the ground into rivers. Thus by recharging ground water harvested from rooftops, the water table rises and the surrounding wells retain water throughout the year.

 

Advantages:

  1. Save money on water bills by using your own water source.
  2. Watering the garden.
  3. No wasting money on water tankers.
  4. No water shortage due to water cuts.
  5. 24 hours water supply. So, no need to depend on water timings.
  6. Recover installation cost within 2 – 3 years due to savings in water bills.
  7. Savings of up to 200 litres of water per family in the society per day.
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