Cavidrain Liner

Cavidrain Liner is a combined tunnel drainage and waterproofing geocomposite liner

Cavidrain® Liner has been specifically designed to be highly flexible to accommodate the contours of the excavated tunnels walls.

Cavidrain Liner

Cavidrain® Liner is a combined drainage and waterproofing liner that is welded to form an integral waterproof system. The sheets are easily fixed to the smoothed excavated walls with a sealed fixing detail and the system is finished with shotcrete.


  • New tunnel construction
  • Repair of existing tunnels
  • Highway tunnels
  • Railway tunnels
  • NATM constructed tunnels
  • Drill and blast tunnels
  • Metro underground stations
  • Cable tunnels
  • TBM tunnels


  • Simplified tunnel lining system.
  • Materials & labour cost reduction. 
  • Reduced installation requirements.
  • Improved drainage capacity.
  • Reduced calcification risks.
  • Minimised damage caused by mineral calcification.

ABG Cavidrain Liner geocomposite for tunnel drainage

Traditional methods of groundwater exclusion are difficult to install with any degree of reliability in modern tunnel constructions. Cavidrain® Liner provides a drainage layer that collects infiltration water from the excavated tunnel face while also acting as the waterproofing function. 

In typical installations, Cavidrain® Liner is fixed to the smoothed, excavated face of the tunnel with rondels and covered with shotcrete. Shotcrete can be sprayed directly to Cavidrain® Liner to create the surface finish, offering 20% less rebound loss than a smooth PVC liner.

Cavidrain® Liner being LLDPE is highly flexible and acts to minimise the build-up of hydrostatic pressure, thus protecting and enhancing the integrity of the tunnel.

ABG Cavidrain tunnel lining system

Typical Client Profile:

  • Tunnel Engineers
  • Tunnel Contractors
  • Railway Engineers
  • Consulting Engineers
  • Utility Service Providers
  • Waterproofing Contractors

Case Studies / Recent Projects:

Cavidrain tunnel drainage geocomposites for tunnel have been used in the following tunnel drainage projects:

Related Products

The following similar products provide solutions for drainage and may be relevant:

ABG Cavidrain tunnel lining system being bonded to the tunnel wall
ABG Cavidrain Liner geocomposite for tunnel drainage

Associated System Products

Within a tunnel construction, our technical team are at hand to discuss your unique requirements. The following product solutions may be a viable alternative: 

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