Alcan, Quebec


Product:         Geotube® Marine Structures Technology

Application:   Diversion Dikes

Location:       Metabetchouan-Lac-a-la-Croix, Quebec

Installation:   2008


The Challenge:

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.  

The Solution:

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 Results:

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.