Tide mill

From Wikipedia,

A tide mill is a specialist type of 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.

Tidal mill at Olhão, Portugal

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. These mills have existed since the Middle Ages, and some may go back to the Roman period.

Possibly the earliest tide mill was located in London at the Thames, dating back to Roman times.^[1] The earliest excavated tide mill, dating from 787, is the Nendrum Monastery mill on an island in Strangford Lough in Northern Ireland.[1] Its millstones are 830mm in diameter and the horizontal wheel is estimated to have developed 7/8HP at its peak. Remains of an earlier mill dated at 619 were also found.

http://en.wikipedia.org/wiki/Tide_mill

the Ecohouse -

met Gill at the GreenLiving marquee behind the City Hall a few weeks back - she produces the excellent magazine - lifestylegreen ( above )

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Tide mill

From Wikipedia,

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