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DRAIN MAX TUNNEL

The DRAIN-MAX 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. Rainwater can pass freely through the bottom and infiltrate into the ground through holes in the side of the tunnel.

drain max

The standard version with the correct covering can cope with a load of up to SLW30 (16,7 kN/m² - the equivalent of a truck with a load of 30 tons) and are durable enough to last for decades.

Each start section is equipped with a single DN 100 hole as an inlet and is capable of connecting to pipes with a diameter of up to DN 300. It is possible to construct a large system at minimal cost because the Drain-Max system only consists of three different components: tunnel, start and end sections. Moreover the system is stackable, so transport costs are also minimal.

Special Features

excellent value-for-money
minimal transport costs (easy stacking)
increased load capacity of up to SLW30
100% porous - minimal space usage
simple and quick installation by linking tunnels together
extended durabilty by using indestructible 100% recyclable Polyethylene (HDPE)
extremely lightweight and portable

DRAIN-MAX-T-1600 Middle tunnel

Size (L x H x B)	2,3 x 0,81 x 1,4 m
Effective length	2,25 m
Weight	30 kg
Volume (net)	1600 litre

DRAIN-MAX-T-100-S / 100-E

Start and end calotte (section)

Size (L x H x B)	0,48 x 0,78 x 1,4 m
Effective length	0,44 m
Weight	5 kg
Inlet DN 100	standard at the top
Inlet DN 150-300	imprinting at the top and bottom
Volume (net)	100 litre

Load capacity complying with DIN 1072 at different installation depths

Height Above Ground [m]	PKW = 5 [kN/m²]	SLW 30/30 = 16,7 [kN/m²]
0,5	o.k.	-
0,8	o.k.	o.k.
1,5	o.k.	o.k.
2	o.k.	-

Other loads on request possible.

Advice: Vehicles should be permitted only after the minimum installation depth has been covered and compacted !

Accessories

S-FK: Sedimentation- and filterbox
S-F pits: INTEWA Sedimentation- and filtering pits in either plastic or concrete
GT-150/300: Filter fabric to cover the DRAIN-MAX systems

Installation

Delivery

The DRAIN-MAX tunnels can be either stacked on pallets or transported individually directly to the building site. The tunnels can then be offloaded either manually or with a forklift.

Transport and packaging sizes

pallet (L x B x H) = 2,40 x 1,40 x 2,00 m
max. pieces = 25 tunnels plus 10 calottes
pallet weight = 0,75 t
infiltration volume = 40 m³
lorry or 45FT Dry Container
max. 9 pallets with 25 tunnels each = 225 tunnels
infiltration volume = 360 m³

System Installation

The DRAIN-MAX tunnels are placed in rows. The smallest system consists of one start- and end section. The rows can be elongated by inserting middle tunnels. The tunnels are secured simply by overlapping the first ridge to the next section. Additional connections are unnecessary. If one row is not sufficient, the next row can be laid next to first row with > 10 cm gap between the single rows and so on.

Load Capacity

Due to their vaulted geometry the tunnels have an enormous load capacity. The standard version with a suitable cover thickness are adapted for loads up to SLW30.

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 special capacity and dimensions are required.

Guarantee/operational experiences

More than 10.000 m³ of DRAIN-MAX tunnel systems is already been successfully used in numerous countries for years. Different references can be viewed at www.intewa.com

Please contact our office for a project design consultation and/or a quote.