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  Water supply and water drainage system of the Gotthard Base Tunnel including a mini power plant: a complex, multipurpose scheme to ensure operational requirement and requirements in case of accident

  To ensure operational and safety requirements a complex multipurpose water supply and drainage system scheme has been set in the 57 km long Gotthard Base Tunnel (GBT). The water supply system makes it possible to refill the fire-extinguishing-and-rescue trains at two locations in each single track tube, to provide cooling water for the underground installed cooling systems, as well as to provide 20 l/s in total for the steady flow in the waste water system, charged at the peak of the tunnel. This water flows down towards the portals, to prevent explosions of flammable fluids in the waste water drainage in case of an accident. The water drainage of the GBT, with separate systems for clean mountain water and for waste water from the single track tubes, is completed at both portals with absorption reservoirs and water treatment facilities. Those have the purpose to cool down the collected mountain water as well as to check the quality and quantity of the drainage water.

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