Graf Infiltration Tunnel

Easy installation

The GRAF Infiltration Tunnels are laid

in lines and can be flexibly adapted to specific conditions and to the individual storage volume requested. The installation of the modules is easy, quick and variable. The installation is possible without heavy equipment, as one Infiltration Tunnel only weighs 11 kg (24.3 lbs). The tunnel modules are simply stuck together in one line.

YOU WILL NEED END PLATES WITH THESE TUNNELS PLEASE SEE RELATED PRODUCTS BELOW 

High infiltration performance

The ditch elements are placed directly upon an even layer of gravel. The sides are then covered with geotextile and the end faces are closed using end plates. This installation and the side slats ensure a permanent high infiltration performance.

300 l Volume

The compact dimensions com- bined with a storage coefficient of 100 % result in a useful vol- ume of 300 l (79 US gal.).

Lorry-bearing up to 60 tons

In order to enable the free arrangement of sur- faces above it, the Infiltration Tunnel features long-term resistance with 59 kN/m2 (Infiltration Tunnel twin 35 kN/m2) and is therefore lorry- bearing.

100 % storage volume

The typical shape of the Infiltration Tunnel enables complete utilisation of the available volume for the temporary storage of rainwater.

Connections up to DN 300 (12")

Large infiltration volumes require large pipe diameters. For the GRAF Infiltration Tunnel, this is not a problem: each end plate features connections in the sizes DN 100 (4"), 150 (6"), 200 (8") and 300 (12"). In addition, connections in the sizes DN 100 (4") and 200 (8") are provided on the upper surface for the connection of a ven- tilation system or an inspection opening.