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The tide mill is situated in a river estuary and collects water from the incoming or outgoing tide. When the river backs up & fills the storage ponds with water it is then trapped behind sluicegates & raised banks.
When the tide has receded and the wheel is free the miller can release the water to turn the undershot wheel.
Depending on how much water is stored the miller may have only 3or4 hours in which to work before the water runs out