Explain the working of underground tanks as a part of roof top rainwater harvesting system practised in Rajasthan.
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(i) In semi-arid and arid regions of Rajasthan, almost all the houses traditionally had underground tanks for storing drinking water.
They are an extremely reliable source of drinking water when other sources are dried up. This is considered the purest form of natural water.
(ii) The tanks can be as large as big rooms.
(iii) The tanks were part of the well-developed rooftop rainwater harvesting system.
(iv) The tank was built inside the main house or the courtyard giving a cooling effect to the rooms in the summer.
(v) Those tanks were connected to the sloping roofs of the houses through a pipe.
(vi) Rain falling on these rooftops would travel down the pipe and stored in these underground tanks.
(vii) Usually, first rainwater is not collected to clean the rooftop and the pipe.