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Concept
Tide mill
Summary
A tide mill is a water mill driven by tidal rise and fall. A dam with a sluice is created across a suitable tidal inlet, or a section of river estuary is made into a reservoir. As the tide comes in, it enters the mill pond through a one-way gate, and this gate closes automatically when the tide begins to fall. When the tide is low enough, the stored water can be released to turn a water wheel.
Tide mills are usually situated in river estuaries, away from the effects of waves but close enough to the sea to have a reasonable tidal range. Cultures that built such mills have existed since the Middle Ages, and some may date back to the Roman period.
A modern version of a tide mill is the electricity-generating tidal barrage.
List of early medieval watermillsPossibly the earliest tide mill in the Roman world was located in London on the River Fleet, dating to Roman times.
Since the late 20th century, a number of new archaeological finds have consecutively pushed back the date of the earliest tide mills, all of which were discovered on the Irish coast: A 6th-century vertical-wheeled tide mill was located at Killoteran near Waterford. A twin-flume, horizontal-wheeled tide mill, dating to c. 630, was excavated on Little Island in Cork. Alongside it, another tide mill was found that was powered by a vertical undershot wheel. The Nendrum Monastery mill from 787 was situated on an island in Strangford Lough in Northern Ireland. Its millstones are 830mm in diameter and the horizontal wheel is estimated to have developed at its peak. Remains of an earlier mill dated at 619 were also found at the site.
In England, an exceptionally well preserved tidal mill, dated by dendrochronology to the late 7th century (691-2AD) was excavated in the Ebbsfleet Valley (a minor tributary of the River Thames) in Kent during construction of the Ebbsfleet International Station, on the High Speed 1 railway line
Official source
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