Warragamba dam deep water storage project

When Sydney Water needed to cut a large hole in the base of Warragamba dam to create a low level outlet, Jetcut were contracted to design, build and operate a tool to do this. 100M underwater.

Warragamba Dam in New South Wales provides Sydney with most of it's drinking water. As climate models began to show that the dam would eventually run out of water, Sydney Water began to look at ways of increasing supply to the city. The dam had no low level outlet meaning that around 10% of it's capacity was un-useable in the event of a water emergency. They decided to cut a hole at the very bottom through the coffer dam to make this water accessible.

The tool that we created was a remotely controlled cutting system complete with SCADA monitoring and cameras. It was used to core 6 holes through the coffer dam (1.8M thick). Two of these holes were for bearing packs, the other four were to allow a plunge type wire saw to cut between them.

The tool that we created was a remotely controlled cutting system complete with SCADA monitoring and cameras. It was used to core 6 holes through the coffer dam (1.8M thick). Two of these holes were for bearing packs, the other four were to allow a plunge type wire saw to cut between them.

Once the coring and cutting was complete the block dropped onto the bearing packs and it was pulled into a purpose built frame that lifted it to the surface.

You can view the video of this project by clicking this link.