Waterproof geomembrane UNDER WATER INSTALLATION

Geosynthetics for infrastructure – under water installation Installing a geosynthetic structure in the wet (the ‘submerging’ of geomembranes) is a Genap speciality. The aim is to create a artificial impermeable barrier so that the infrastructure and civil engineering structures can then be constructed in dry conditions. This method of building is unique in the world and is associated with the typical ground conditions found in the Netherlands. For this method we ballast the geomembrane using sand in order to achieve equilibrium and within the geomembrane structure we create a lower polder water level. The submerging of a geosynthetic structure is relatively simple and very cost-effective, certainly when compared to using underwater concrete or well-point drainage. The first project using this technique was undertaken as far back as 1984, close to Amelisweerd, and the method has now become essential for road and waterway infrastructure projects. We can also use this method very effectively within sheet pile excavations, even in urban areas. In addition to allowing us to install a geomembrane under water, this technique also allows us to install other geosynthetic materials such as clay liners (GCL’s) and protective geotextiles, known as non-wovens.