Discuss how rainwater harvesting in semi-arid regions of Rajasthan is carried out.

  • In Rajasthan, to store drinking water, ‘Rooftop rainwater harvesting’ was commonly practised.
  • Rain fed storage structures were created in agricultural fields. It allowed water to stand thereby moistening the soil – Johads in different parts of Rajasthan, and Khadins in Jaisalmer.
  • For storing drinking water, all the houses had tankas or underground tanks in Balmer, Phalodi, Bikaner regions of Rajasthan.
  • The size of tankas would be as large as a big room.
  • The Rooftop rainwater harvesting system had tankas which were built inside the courtyard or main house.
  • Through a pipe they were connected to the sloping roofs of the house.
  • These underground tankas are used to store rainwater, which falls on the roof and flows down through pipes.
  • Due to the perennial Rajasthan Canal, rooftop rainwater harvesting is on decline.

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