Description of the water reserves of the Indus Valley Civilization

Give a detailed description of the water reserves of the Indus Valley Civilization?

WATER RESERVES 

Depending on the geographical  location of the site and the environmental conditions, wells, tanks and reservoirs were constructed to address the various requirements related to water. Jensen estimated that there may be more than 700 wells at Mohenjo-daro. By comparison, Harappa had at least 30 wells. Similarly, in the excavations of chanhudaro, Kalibanga, Lothal and Dholavira, evidence of limited number of wells has also been found. Most of these wells were lined with specially made wedge-shaped bricks to form a structurally sound cylinder with a depth of about 10-15 m, which would not collapse under the pressure of the adjacent earth. There were deep grooves on the upper edge of the brick well, except at dholavira, where such marks are seen on basal stone slabs of the trough, indicating the use of ropes, probably of leather bags, to lift the water. With at Mohanjo-daro, the diameter of wells ranged from 60 cm (being the smallest) to 2.1 m (being the largest). Whereas, in the palace area of Dholavira, the largest is the highly skilled masonry work employed in the construction of the well, which has an inner diameter of 4.12 meters.

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