(1) In semi-arid and arid regions of Rajasthan, particularly in Bikaner, Paladin and Barer, almost all the houses traditionally had underground tank or tanks for storing drinking water.
(2) The tanks could be as large as a big room; one household in Paladin had a tank that was 6.1 meters deep, 4.27 meters long and 2.44 meters wide.
(3) The tanks were part of the well-developed rooftop rainwater harvesting system and were built inside the main house or the courtyard.
(4) They are connected to the sloping roofs through a pipe and store rainwater in these underground `tanks’.
