Sukkur Bairaj

The Sukkur barrage is an enormous barrage across the Indus River in the neighborhood of the city of Sukkur, Sindh Province, Pakistan. It was constructed during the British Raaj from 1923 to 1932 as the Lloyd Barrage to help lessen food crisis caused by the lack of downpour. The barrage allows stream to pour through what was initially a network of channels 6,166 miles (9,923 kilometers) stretched, nourishing the biggest irrigation structure in the world, with over and above 5 million acres (20,000 square kilometers) of irrigated soil.
The holding wall has 66 spans, each 60 feet (18 meters) extensive; every span has a door which weighs 50 tons.