Flooding can occur if a dam fails. Alternatively, a dam operator may release excess water downstream to relieve pressure from the dam. That action could cause flooding, too. That is why it is so important to know how close you live to a dam.
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National statistics show that overtopping due to inadequate spillway design, debris blockage of spillways, or settlement of the dam crest account for approximately 34% of all U.S. dam failures. 2. Foundation Defects, including settlement and slope instability, cause about 30% of all dam failures. 3.
On 1st December 1923, the failure of the Gleno dam caused a huge disaster, which devastated the Scalve valley in the province of Bergamo in Lombardy (northern Italy).