Maintain the balance of the water cycle

Periods of drought followed by heavy rain are an increasingly common phenomenon. This development, which is caused by climate change, is being aggravated as more and more areas are built on for streets, car parks and buildings. It is not possible for the heavy rainwater to flow away, and it therefore builds up, causing flooding or even worse. At the same time, this causes the groundwater level to fall and disturbs the water cycle.

Graf’s percolation products counter this development. They enable the restoration of the natural cycle, the percolation of rainwater and formation of groundwater reserves. They also relieve the burden on the sewage network and wastewater treatment plants.

The percolation bloc and percolation tunnel modules combine the need to handle rainwater in an ecologically sound manner with scope for saving on construction and water management charges. This makes them particularly lucrative and cost-effective. Compared with a standard gravel infiltration ditch, 800 kg of gravel or a 36 m drainage pipe can be replaced with a module that weighs just 16 kg. It requires less digging and saves on logistics costs. In addition, less transport means fewer CO2 emissions. 

The design of the GRAF percolation tunnel / twin also means that the individual modules can be stacked on a single europallet with ease. The percolation tunnel is then assembled on-site and offers a large storage volume of up to 300 litres per module. In this manner, the delivery of large percolation volumes is both cost-effective and ecological, even over long distances. 

At the GRAF sites in Dachstein (Alsace) and Teningen, excess rainwater is percolated using GRAF percolation modules. This therefore compensates for the hard surfacing of car parks and storage areas. Flooding is prevented and construction and wastewater management charges are saved.