Landfill capping with a geocomposite as a drainage layer

Landfill capping with a geocomposite as a drainage layer

Coesfeld-Flamschen (Germany) | Bonar

When the soil and construction waste landfill in Coesfeld-Flamschen  in Germany  was closed, the surface had to be sealed. The initial concept was to place a mineral seal 50 cm thick followed by a mineral drainage layer 30 cm thick and finally a 1.0 m soil layer for recultivation on top.

Instead of a mineral drainage layer, Enkadrain ZB was chosen as surface drainage: a geosynthetic drainage mat that offered a much faster construction time and cost savings. The report on its suitability by the German federal institute for materials research and testing (BAM:  Bundesanstalt für Materialforschung und -prüfung) certified that Enkadrain® ZB is equivalent to a 30 cm thick mineral drainage layer. As a result, Enkadrain ZB was accepted and approved by the planning authorities.

Coesfeld-Flamschen  (Germany) | Colbond

click to zoom

Enkadrain ZB was laid using a special tracked vehicle. This meant the Enkadrain ZB rolls could be installed quickly and accurately. Afterwards the upper fibrous overlaps were protected by thermal sealing against soil runoff into the drainage core. The size of the rolls at 5.0 m x 100 m made very fast and easy laying of the mat possible.  The recultivation soil on top was laid using a front-end loader, just as planned, again using a special tracked vehicle.

Enkadrain ZB is part of a range of Enkadrain Wide types that are used as water- and gas drainage layers at landfills. Enkadrain Wide products have an excellent long-term performance, as is shown in the past three decades by numerous laboratory tests and landfill excavations. Additionally, the German BAM institute certified Enkadrain ZB for a technical lifetime expectation of minimal 100 years.