Explain the working of underground tanks as a part of roof top rainwater harvesting system practised in Rajasthan. -SST 10th

Explain the working of underground tanks as a part of roof top rainwater harvesting system practised in Rajasthan. -SST 10th
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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.  (ii) The tanks can be as large as big rooms.  (iii) The tanks were part of the well-developed rooftop rainwater harvesting system.  (iv) Tanks were connected to the sloping roofs of the houses through a pipe.  (v) Rain falling on these rooftops would travel down the pipe and stored in these underground tanks.  (vi) Usually first rain water is not collected to clean the rooftop and the pipe.
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