Infiltration Tunnel
The GRAF Infiltration Tunnel is a lightweight, modular stormwater solution for private and rural areas, ideal for driveways, accessways, and green areas.
Infiltration Tunnel
The GRAF Infiltration Tunnel is an efficient, space-saving solution designed for private and rural stormwater infiltration. Lightweight, modular, and highly durable, this system offers a cost-effective way to manage surface water while supporting sustainable land development.
Each tunnel module weighs only 11 kg, making handling and installation simple and fast without the need for heavy equipment. The system consists of one or several tunnel modules with end plates and can be extended indefinitely, allowing complete flexibility in length and layout. Modules can be arranged in multiple parallel rows at the same depth to match project requirements.
Despite its low weight, the infiltration tunnel delivers exceptional strength. The system supports permanent loads up to 59 kN/m², making the area above the tunnels fully lorry-bearing. This creates valuable usable ground space for driveways, accessways, parking areas, or landscaped zones.
Made from 100% recycled materials in GRAF’s world-class competence centre in Herbolzheim, the infiltration tunnel combines sustainability with long-lasting performance. The high-quality recycled plastic ensures structural reliability while reducing environmental impact.
The system offers additional cost savings by helping reduce rainwater discharge fees in qualifying regions. For households or rural properties where managing stormwater onsite is required, the infiltration tunnel provides a long-term, eco-friendly solution backed by a 5-year warranty.
Documentation
BRO-018 Infiltration Tunnel
About the Product
The GRAF Infiltration Tunnel is a lightweight, modular stormwater solution for private and rural areas. Made from 100% recycled material, each 11 kg module is easy to install, highly durable, and permanently load-bearing up to 59 kN/m² — ideal for driveways, accessways, and green areas.
Call For a Quote:
0800 776 9727
F.A.Q.
Explore common questions about the GRAF Infiltration Tunnel— a lightweight, modular stormwater solution for private and rural areas, ideal for driveways, accessways, and green areas.
What is the GRAF Infiltration Tunnel used for?
It is designed to store and infiltrate stormwater back into the soil, making it ideal for private properties, rural areas, and developments requiring onsite water management.
How strong is the infiltration tunnel?
Despite its lightweight design, the system is permanently load-bearing up to 59 kN/m², making the surface above suitable for vehicles and lorries.
Is the system easy to install?
Yes. Each module weighs only 11 kg, making installation quick and manageable without heavy machinery. Modules can be placed in single or multiple rows.
What materials are the tunnels made from?
They are made from 100% recycled plastic produced in GRAF’s advanced recycling and manufacturing centre in Herbolzheim, supporting environmental sustainability.
Can the infiltration tunnel help reduce rainwater charges?
Yes. Many councils allow reduced rainwater discharge fees for properties managing stormwater onsite. Contact your local municipality for eligibility.
Related Products
Geotextiles
GroundCo Geotextiles provide strength, durability, and soil separation, ensuring long-term stability, filtration, and performance across diverse civil construction projects.
Stormcell
The StormCell is a smart engineered system designed for stormwater detention, to reduce weight and preload or to effectively fill a void.
Ecobloc
EcoBloc by GRAF offers modular, sustainable stormwater management solutions — lightweight, high-capacity, and engineered for infiltration, detention, and reuse.