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Completed work

Step 9: Commissioning the gates

Cables and wires

The gantry structure Working on the cable drums Working on the cable drums

With all the pieces of the puzzle in place - gates, gantries, cables, counterweights - the final step was to link them all together into a working mechanism.

The gates were fixed to the brackets on the sides of the lock with steel pins which act as the hinge. These pins are covered with an advanced self-lubricating nylon compound which means they will not need greasing.

The counterweights were positioned over the pits with wire cables running to the winch. A second set of cables run from the winch to the lifting arms of the gates. When the winch starts to turn, the cable drum winds up the cable from the gate and at the same time winds out cable to the weights so they can drop into the pit.


It is important to make sure the cable is rigged in the right way, with the 'lay' of the cable (i.e. the twist of the strands) going in the right direction or it starts to unravel very quickly with use.

As well as rigging the cables, we installed sensors on the gates and gantries to confirm their position as they move. A second set of hydrostatic sensors will constantly measure the height of water in the Waterworks River. If the water gets to dangerous levels, the gate will automatically open to allow excess floodwater through into City Mill River and the rest of the Bow Back Rivers. 


This page is part of The restoration playbook