Why did the rockslide at Vaiont Dam result in so much loss of life?

The falling rock mass acted like a huge piston, pushing the water of the lake against Casso and Erto, two small villages on the slope in front of the slope that failed, and then over an artificial dam 210m high. A large wave overtopped the dam and reached the town of Longarone at 10:46 p.m., destroying it.



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On 9 October 1963, during initial filling, a landslide caused a megatsunami in the lake in which 50,000,000 m3 (1.8×109 cu ft) of water overtopped the dam in a wave of 250 m (820 ft), which brought massive flooding and destruction to the Piave Valley below, leading to the destruction of several villages and towns, ...

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A wave of water washed above the lake to Casso and Erto, communities above the reservoir, where the air blast and water destroyed buildings and caused at least 158 fatalities. Five downstream towns were destroyed including Longarone, Pirago, Rivalta, Villanova, and Fae.

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Francis Dam in the San Francisquito Canyon. Nearby these haunting reminders, there is a sign: “On March 12, 1928, just before midnight, it collapsed and sent over twelve billion gallons of water roaring down the valley of the Santa Clara River. Over 450 lives were lost in this, one of California's greatest disasters.”

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Banqiao Dam Failure (China, 1975) The Banqiao Dam failure is considered the deadliest dam disaster in history. Heavy rainfall caused the dam to collapse, leading to a catastrophic flood. The estimated death toll ranges from 26,000 to 171,000, with millions of people affected.

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The St. Francis Dam, created by the Los Angeles County Water and Power company as part of the California aqueduct system, collapsed at 11:58 pm on March 12, 1928, making it the was the worst manmade disaster in California history.

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Three minutes before midnight on March 12, 1928, the St. Francis Dam collapsed, sending over 12 billion gallons of water and debris rushing down the Santa Clara River Valley from San Francisquito Canyon to the Pacific Ocean, 54 miles away. In six hours more than 450 people were swept away in the dark and murky waters.

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Francis Dam disaster, catastrophic dam failure in California on March 12, 1928, that was one of the worst civil engineering failures in American history. The ensuing flood killed hundreds and swept away thousands of acres of fertile land.

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The January 5, 2023 spillway failure of the North Fork Dam on Pacheco Creek is an unfortunate sign that California has much work to do to ensure dam safety. The North Fork Dam has been a focus of the California Department of Water Resources (DWR) Division of Safety of Dams (DSOD) since at least 2017.

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Banqiao Dam Failure (China, 1975) The Banqiao Dam failure is considered the deadliest dam disaster in history. Heavy rainfall caused the dam to collapse, leading to a catastrophic flood. The estimated death toll ranges from 26,000 to 171,000, with millions of people affected.

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