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