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Overshot waterwheels exploit gravity by receiving water from an elevated flume near the of the wheel. The liquid fills wooden buckets mounted along the rim, and its cumulative turns the axle. Because potential energy converts directly into rotational force, this design achieves higher mechanical than undershot wheels, which rely purely on the natural of flowing stream currents.
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Tide mills operated along sheltered estuaries where incoming high tides filled an enclosed retention 1. As the sea receded, sluice gates prevented the water from 2 immediately, creating an artificial head of water. When released during low tide, the stored volume drove a waterwheel, enabling coastal communities to grind flour on a predictable 3 that followed lunar rather than seasonal 4.
In medieval Europe, the watermill was a critical instrument of feudal authority under the system of mill soke. Manorial lords held a legal 1 over grain processing, compelling tenant farmers to grind their harvest exclusively at the lord's mill. In exchange, the miller retained a fixed 2 of the flour as payment. This practice generated substantial revenue, turning milling infrastructure into a heavily contested 3 in rural communities.
Beyond grinding cereals, waterpower transformed manufacturing through specialised adaptations such as the fulling mill. By replacing manual trampling, water-driven trip hammers 1 beat raw woven wool in vats of alkaline liquid. This mechanised percussion cleansed impurities and 2 the fabric fibres, creating a dense, weather-resistant cloth. The rapid spread of these mills dramatically lowered production costs and accelerated the regional 3 of the textile trade.
Horizontal watermills, often termed Norse mills, featured a horizontal wooden wheel connected directly to the upper grindstone without intermediate 1. Driven by high-velocity mountain streams directed through a narrow chute, these compact structures were simple to construct and maintain. Although they delivered lower torque and 2 less flour than vertical mills, their low cost made them ideal for 3 communities with modest grain yields.
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