Balloki Barrage, constructed on River Ravi, is located about 60 km D/S of Lahore, the capital of Punjab, Pakistan,. The Barrage feeds two canal systems viz. Lower Bari Doab Canal and Balloki Sulemanki Link Canals.
This structure was constructed in 1913 in the form of a level crossing where supply from the Upper Chenab was dropped into the river Ravi on the right bank, crosses it at bed level and was taken off on the right bank at Balloki in 1913. The group of works consists of an inlet, a barrage, a regulator, and training works.
The barrage consists of a weir 1646.5 feet extreme length divided into 35 bays each 40 feet clear by piers 7.25 feet wide. In this locality where fine sand forms the river bed the floor is especially wide to reduce the danger from blowing up. The flank walls and piers are 22.34 feet high and are surrounded by steel trestles, which carry the operating platform. The gates are counterbalanced on the Stony principle and the machinery is geared to lift the gates at short notice and lower them according to the requirements of the regulation. A road way crosses the barrage, on the downstream side of the gates.
The Head regulator has 15 bays each 20 feet clear divided by piers of 3.8 feet wide. There is a permanent sill 6.41 feet high and a further temporary sill of 2.5 feet height obtained by rising gate 2.75 feet high, making it possible to exclude heavy silt from the canal channel. The gates are in two parts, the upper falling and lower rising to shut the vents. There is a road way over the regulator and upstream of this is the platform carrying the operating machinery, which has been geared to close the vents quickly and open at leisure.
The training works consist of a number of bunds and groynes and are intended to bring the stream true to the barrage and convey it to a safe distance downstream.