Drainage and waterproofing on capping of the landfill of Saint Brès

Abstract

Objectives of the Saint-Brès landfill capping are waterproofing, water drainage and earth retaining. Slopes on cover reach 66% with length superior to 10 m. Geosynthetic solution is composed from bottom to top of a protective geotextile, a drainage geocomposite industrially associated to a textured 8/10 mm polyethylene film to increase the stability of the system and a earth retaining geogrid. Geocomposite has been designed with Lymphéa® software to drain a rain of 266 mm/day. A polyethylene film was welded on site to increase the waterproofing of the capping.