Why don t tunnels flood when it rains?

Given that many tunnels are below ground, they have long been designed and built to be watertight and with features that provide flood defence. Anti flooding measures include drainage systems, pumps, waterproofing of walls and ceilings, and increasingly sophisticated flood warning systems.



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At 37.9 kilometres (23.5 mi), it has the longest underwater section of any tunnel in the world and is the third longest railway tunnel in the world. The speed limit for trains through the tunnel is 160 kilometres per hour (99 mph). The tunnel is owned and operated by the company Getlink, formerly Groupe Eurotunnel.

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1. Drainage systems: Tunnels have an extensive network of drainage systems in place. This includes channels, pipes, and pumps that collect and redirect rainwater away from the tunnel. The drainage systems are designed to handle the anticipated volume of water during heavy rainfall events.

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Accidents in tunnels are more dangerous than in the open air. An explosion or fire may cause considerable damage and hazardous substances cannot be removed quickly. Smoke causes poor visibility, lack of oxygen rapidly occurs and there may be panic. It is difficult to escape from a tunnel.

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Fritchley Tunnel is a disused railway tunnel at Fritchley in Derbyshire, England, which is believed to be the oldest surviving example in the world. The tunnel was constructed in 1793 by Benjamin Outram as part of the Butterley Gangroad, altered in the 1840s, and remained in use until the railway closed in 1933.

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The Laerdal Tunnel in western Norway is the longest road tunnel in the world. It takes about 20 minutes to pass through the tunnel. Brightly colored lights placed every six kilometers help drivers stay alert.

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You can get out your vehicle, but you stay with your car. The carriage is lit and there are toilet facilities available.

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Hazardous Articles include but are not limited to fireworks, firearms, explosives and weapons of any kind. 3.1 The Carriage of Hazardous Articles is subject to prohibitions and restrictions. 3.1. 2 Firearms: the Carriage of Firearms is RESTRICTED.

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