Question

name some of ancient structure used for rainwater harvesting

Answer 1

Taanka is a traditional rainwater harvesting technique indigenous to the Thar desert region of Rajasthan. A Taanka is a cylindrical paved underground pit into which rainwater from rooftops, courtyards or artificially prepared catchments flows.

                                       

Answer 2

Some ancient structures used for rainwater harvesting are:
# Kuls or Guls
# Rooftop rainwater harvesting system
# Inundation channels
# Khadins and johads

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