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17.12.2025

Transport hazard summary: reservoir dam collapse

The DfT have provided information if this unlikely event occurs

This summary explains some of the main risks to transport in the unlikely event of a reservoir dam collapse, including sudden flooding and destruction of transport infrastructure. It also provides advice to help mitigate and plan for these risks.

Direct impacts from reservoir dam collapse include:

sudden, life-threatening flooding from a reservoir that can destroy transport infrastructure

power outages and disruption to communications infrastructure, affecting electric trains, signalling systems and emergency services

This forms part of the Transport hazards summaries series, which helps organisations understand hazards that can impact UK transport.

Click here for more information : Transport Hazard Summary - reservoir dam collapse

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