The worst dam collapse ever killed an estimated 171,000 people in the floods of 1975. The causes of the dam failure were both natural and man-made. The amount of rainfall received by the area was double the amount the dam had been constructed to withhold. However investigations have also reported that the dam was poorly engineered and constructed making it vulnerable to such contingencies. On August 8 the dam collapsed and released a total of 15.38 billion m3 of water. The natural disaster coupled with man-made errors destroyed lives of over 250,000 people.http://pelings.com/
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