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Pedant warning:


The correct terms are "High Water" and "Low Water". Tide tables will use these terms.


A tide is a directional flow of water - so it can be coming in (as in running up the Thames Estuary) leading to a high water poin at a certian time, when it turns and start to go out (running down the Thames Estuary) or it can be an east / west / south / north flow at sea that changes direction at the turn of the tide. Such effects are usually only observable in coastal waters.


Some ports, by virtue of the local topography can have two high waters (Southampton for instance where the tide flows around the Isle of Wight - with one flow going to Southampton past The Needles and the other flow going east about the Isle and entering the Hamble from the Portsmouth side of the estuary)


Currents, on the other hand do not change direction but do vary a little with wind, weather and tide.


Complicated stuff - the sea.

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