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Encyclopedic overview
A watermill is a structure that uses a water wheel or turbine to drive a mechanical process such as flour milling (using a pair of millstones), lumber production, or metal shaping (rolling, grinding or wire drawing). A watermill that generates electricity is usually called a hydroelectric plant.
Excerpted from Wikipedia’s “Category:Watermills” article, available under the CC BY-SA 4.0 licence.