Answer:
In
semi-arid regions of Rajasthan every house had underground tankas to store the
water for drinking purposes. These tankas are large and deep tanks which were
built inside the main house or the courtyard.
They were linked to the sloping roofs of the houses through a pipe.
Rainwater falling on the rooftops would run down through the pipe and collect
in the underground tankas.
The rainwater collected was stored in the underground
tankas providing drinking water till the next seasons. When all other sources
have dried up, these tankas were beneficial to beat the summer heat as they
kept the rooms cool. The rainwater or palar pani, as it was commonly known in
these parts, is considered the purest form of natural water.
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