50,000 large dams

An aerial view of a concrete dam with three spillway gates releasing rushing water into a forested valley.
Qurren, via Wikimedia Commons (CC BY-SA 3.0)
The International Commission on Large Dams counted about 5,200 large dams worldwide in 1950 and lists more than 58,000 today, most built in the last sixty years. The World Commission on Dams documented their toll on displaced communities, fragmented rivers and trapped sediment.
A large dam, by the definition of the International Commission on Large Dams (ICOLD, founded 1928), is one at least 15 metres high, or between 5 and 15 metres and holding back more than 3 million cubic metres of water. ICOLD's World Register of Dams counted about 5,200 such dams in 1950 and lists more than 58,000 today, most built in the last sixty years for irrigation, hydropower, water supply and flood control; the World Commission on Dams (1997-2000) documented their displacement of communities, fragmentation of rivers and trapping of sediment. Cited among the scale of destruction offered as evidence for the Capitalocene framework: "building over 50,000 large dams, fundamentally rerouting rivers".

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