The capping for the landfill at Sogliano Ambiente called for careful planning, given that the gradient of the escarpments (around 23°) and the lengths involved (60-65 m) were not inconsiderable. To restrict the depth of the covering layers to around 1.5 m Geosintex specified the installation of a SINTEXDRAIN GSG type drainage geocomposite for the management of biogas and rainwater, in place of the regulation 50 cm of gravel that would otherwise be needed for each of the two layers. Also, given the geometrical configuration of the slopes, Geosintex engineers carried out the verifications needed to evaluate the stability of the package, adding the EDILGRID geogrids for reinforcement. In addition to reducing the depth of the capping layers, which otherwise would be complex to deploy and render safe, the use of geosynthetics both speeded up the installation process, and avoided heavy expenditure on aggregates.
