How did underground cities not flood?

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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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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