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In page Malpasset Dam:

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Between November 19 and December 2, there was 50 centimetres (20 in) of rainfall, and 13 centimetres (5.1 in) in 24 hours before the breach. The water level in the dam was only 28 centimetres (11 in) away from the edge. Rain continued, and the dam guardian wanted to open the discharge valves, but the authorities refused, claiming the highway construction site was in danger of flooding. Five hours before the breach, at 18:00 hours, the water release valves were opened, but with a discharge rate of 40 m³/s, it was not enough to empty the reservoir in time.