Butler Manufacturing Services Ltd. (BMS)

Drainmax Attenuation/Infiltration Tunnels



The DIBT Certified Drainmax Tunnel System consists of lightweight, plastic, semi-circular shells with the capacity to buffer and infiltrate rainwater from sealed surfaces into the ground.  The semi-circular shells have a 100 % buffering capacity and three times the storage volume of a conventional gravel ditch.

Drainmax Tunnels are certified by the German DIBT (Structural Engineering Institute)  DIBT Certification is the equivalent of full Agrément Certification.  Rainwater can pass freely through the bottom and infiltrate into the ground through holes in the side of the tunnel.

The 60 tonne version, which BMS uses as standard can cope with a load of up to HGV60 (60 tonnes) and has an axle load limit of 20 tonnes (with the correct level of cover)  The tunnels are extremely durable because they are made from High Density Polyethylene (HDPE) meaning they will last for decades.

Each start section is equipped with a single DN 100 (4') hole as an inlet and is capable of connecting to pipes with a diameter of up to DN 300 (12') It is possible to construct a large system at minimal cost because the Drainmax system only consists of three different components: tunnel, start and end sections. Moreover the system is stackable to minimise transport costs

  • excellent value-for-money
  • minimal transport costs (easy stacking)
  • increased load capacity of up to SLW60
  • 100% porous - minimal space usage
  • simple and quick installation by linking tunnels together
  • extended durabilty by using highly rugged 100% reprocessed HDPE
  • extremely lightweight and highly portable.

Due to their vaulted geometry the tunnels have an enormous load capacity. The Drainmax version which BMS use, with a suitable amount of cover, can withstand loads up to SLW60.

Important: The load capacity specifications refer to light traffic such as car parks, driveways or terminals. In areas with continous, heavy traffic, such as motorways or roads with alternating loads and velocities custom capacity and dimensions are required.  

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