Project Description
The Communaute Urbaine de Bordeaux (CUB) inherited the Labarde Landfill on the northern outskirts of the city of Bordeaux in southern France. The site is adjacent to the River Garonne, and concern was raised of a risk of leachate being flushed into the river. The 600,000m² site needed to be capped urgently in response to public pressure, with a leachate treatment lagoon and surface rainwater run-off lagoons constructed to ensure the safety of the local area.
The Challenge
The primary challenge of this largely flat site was to collect the rainwater, with the goal of channelling it to perimeter receptor drains. The surface water run-off could then be taken to the separate lagoons around the perimeter for monitoring and eventual safe discharge.
The CUB had limited funds to achieve a fully lined permanent capping including multiple layers of mineral, geomembrane liner and drainage layers. The site needed an economic solution that could be used to effectively cap the site and efficiently direct the rainfall to the collector drains. With the time pressure, as well as a lack of funds, the CUB needed an easy to install all-in-one solution which would meet environmental legislation.
The Solution
A specially made ABG Pozidrain 4SK geocomposite was supplied comprising of an impermeable cuspated core with high drainage capacity thermally bonded to a filter geotextile, forming an all-in-one impermeable drainage geocomposite.
The Pozidrain landfill cap drainage geocomposite had the additional feature of an extended flat selvedge of impermeable core, providing a near impermeable joint between panels when loaded with cover soil. The filter geotextile had an overlap that was hot air welded along the edge to prevent the ingress of soil. This had the further advantage of preventing any movement of the geocomposite during the backfilling. Installation was completed rapidly in one efficient operation.
ABG Pozidrain 4SK Drainage Geocomposite
The ABG Service
ABG, in co-operation with distributor Huesker France, assisted the client with design information and adapted the Pozidrain selvedge to give optimum overlap. With this large project it was important to schedule deliveries to maintain efficient installation and meet the tight completion deadline required.
