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The century old (1909) overhead steel tank is 1.34041 lakh square feet in area having a depth of 16 feet. It is the largest overhead tank in the world built by the British engineers. The massive water reservoir contains nine million gallons of filtered water and is placed 110 feet above the ground. In those days most of the buildings in the city were two or three storeys high. Besides, it was the first point of city's water supply distribution system. The unique feature of the tank is that no separate pipe lines for filling up and delivery. The pipe that fills the tank also used for delivery. Hence, the overhead tank serves role of balancing tank. When underground tank at Tallah is spilled over with the incoming supply from Pulta water works( 24 km upstream of Calcutta) the surplus water is stored in the overhead tank and again when the water level in the underground tank dwindles it compensates the for the loss due to distribution. It seems to be that in order to add pressure to the gravitational flow of the water the overhead tank was placed at a height.

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