• Once the excavation and maintenance of the tunnel and running east and stabilized, it is necessary to complete construction of the tunnel, installing the waterproofing, drainage, lining and strong.
• With the sealing of the gables and the roof of the tunnel is to prevent water filtration, come from the rock inside the tunnel. This entry of water has two effects:
  • The water attacks the concrete and steel support and tunnel lining eroding. Over time they can be completely destroyed, forcing a repair coating, which typically require the closure of the tunnel to traffic.
  • Moreover, the water falling on the road can be dangerous for vehicles by the possibility of landslides and even formation of ice sheets.
• The waterproofing of tunnels, except in very specific is not so, ie not prevent water from entering the tunnel, but is allowed to enter by default places and there is conducted and channeled through the longitudinal drainage system tunnel to the outside.
• This has some advantages over complete waterproofing system that prevents a completely water inlet, first hydrostatic loads are avoided on the coating, which with high headboards, can become very important. On the other hand, result in lower cost of the work.

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