How Horrific is a Dam Failure? It Can Wipe Out a City in Minutes

How terrifying is a dam failure? It’s an apocalyptic disaster far beyond the imagination of most people. This is not a slowly rising flood, but an underwater nuclear strike that can level an entire city and leave hundreds of thousands homeless in minutes. Once it happens, there is almost zero chance of escape or remedy. When a 10-meter-high dam collapses, the floodwater can surge at speeds of up to 15m/s – more than 5 times faster than a regular flood. Carrying rocks, steel bars and debris, each cubic meter of the torrent delivers dozens of tons of impact force, turning reinforced concrete buildings, railways and bridges into paper-thin wreckage. What makes it even more desperate is the near-zero escape window: for areas within 10 kilometers downstream of the dam, the flood peak can arrive in as little as 5 minutes, leaving no time for mass evacuation. Most people won’t even have a chance to react before being engulfed. In 2024, the collapse of two dams in Derna, Libya, sent a 7-meter-high flood peak tearing through the city, wiping out a quarter of the urban area in just 4 minutes, leaving over 11,000 people dead and another 10,000 missing. In 1975, the failure of the Banqiao Reservoir Dam in Zhumadian, Henan, China, unleashed a 30-meter-high flood peak, causing 62 reservoirs to collapse within 6 hours and leveling dozens of towns and villages downstream – one of the deadliest dam failures in global history. Worse than the instantaneous destruction is the cascading chain of