The break of the Malpasset Dam, a 60-m high arched structure with a thin diaphragm wall, caused 423 victims and displaced 7,000 more. After several days of torrential rains, this dam set up on the Reyran River north of Fréjus broke at 9:11 pm during its first filling (a critical phase in the life cycle of a dam). A 50 million-m3 deluge of water flooded the Reyran Valley, devastating everything in its path. The city of Fréjus was inundated in just a few minutes by a wave of water and then mud 21 minutes later.
The consequences of this accident [...]