Product: Geotube® Marine Structures Technology
Application: Diversion Dikes
Location: Metabetchouan-Lac-a-la-Croix, Quebec
Alcan, Inc., a leading aluminum producer, owns and operates several hydropower facilities in Quebec. The company plays an active role in water resources management and shoreline erosion prevention. A recent effort involved the need to stabilize the banks of Lac Saint-Jean near Metabetchouan-Lac-a-la-Croix in South Central Quebec.
Geotube® marine containment technology proved a great match for this stabilization project. A series of three diversion dikes would be placed in Lac Saint-Jean to help protect the lake's bank.
The installation occurred during the winter while the lake was frozen solid. The ice was excavated allowing the contractor to install the Geotube® units in the dry [photo 2]. Workers went 300 meters offshore to drill through the ice to reach the water below the frozen lake surface [photo 3]. The water was pumped back to shore where it was used to create the sand slurry mix for filling the Geotube® containers [photo4].
First, a protective Geotube® scour apron was deployed at each work site. Then anchor tubes were placed along both sides of the apron [photo 5]. The project utilized six Geotube® units measuring 5.18 meters circumference and 33 meters long. The installation was completed in less than two weeks. Following the winter thaw, the Geotube® structures were submerged in Lac Saint-Jean.
The completed series of three Geotube® jetties stretches 200 feet into the lake [photo 6]. These structures have successfully eliminated erosion along the lake's shore.