Half Tide Dock
Encyclopedia
A half tide dock is a partially tidal dock
Dock (maritime)
A dock is a human-made structure or group of structures involved in the handling of boats or ships, usually on or close to a shore.However, the exact meaning varies among different variants of the English language...

. Typically the dock is entered at high tide. As the tide ebbs a sill or weir
Weir
A weir is a small overflow dam used to alter the flow characteristics of a river or stream. In most cases weirs take the form of a barrier across the river that causes water to pool behind the structure , but allows water to flow over the top...

prevents the level dropping below a certain point, meaning that the ships in the dock remain afloat. Half tide docks are particularly useful in areas with a large tidal range.
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