1975 Banqiao Dam failure

In August 1975, the Banqiao Dam and 61 others throughout Henan, China, collapsed following the landfall of Typhoon Nina. The ensuing flood was among the deadliest floods in China and was the third-deadliest flood in history. It affected 12,000 km2 (3 million acres) with a total population of 10.15 million, including around 30 cities and counties, with estimates of the death toll ranging from 26,000 to 240,000.