Dominion Divers has been involved in the design and installation of cofferdams of all shapes, sizes and configurations over the years.

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The temporary dewatering of a work area can come with many challenges, based on factors such as: area and water depth, geographic location and accessibility, availability of materials, and environmental concerns.

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This project took place in a remote, environmentally sensitive location, with winter road access only. The irregular bedrock of the water passage precluded the use of sheet piling. Additionally, there was no place to stage a crane and no way to mobilize a heavy barge. No suitable native materials were available in the area, and there was a strict requirement to minimize turbidity in the fish habitat.

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Clean sand, fabric bags, material for a membrane and a lightweight barge with a gantry system for placing the bags were all mobilized to site during the winter an stockpiled to await the open water construction season.

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Work crews were flown into the site during the longest days of the summer to build the structure while living in a tent camp on a rocky beach. After work in the water passage was complete the cofferdam was removed with minimal cleanup required and with no impact to the environment.