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Turning basin
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A turning basin,

(2025). 9780727740861, Thomas Telford.
winding basin or swinging basin is a wider body of water, either located at the end of a or in a to allow to turn and reverse their direction of travel, or to enable long narrow barges in a to turn a sharp corner.

For a complete 180-degree turnaround, the width of the basin must be more than the length of the longest vessel normally the . Onboard or may assist in manoeuvering the ship.

In seaports the turning basin is often not a real physical basin, but a designated area in the harbour basin where turning is possible and mooring is prohibited. In the example from Gdynia the plan is to enlarge the existing turning basin by removing a part of an existing quay (shown in red in the image).


Dimensions
PIANC guideline 141
(2025). 9782872232574, PIANC. .
recommends a turning basin diameter for channels of 1.2 times the ship's length; in China, twice the ship's length is used. For seagoing vessels, PIANC guideline 121
(2025). 9782872232109, PIANC. .
recommends a diameter of 2 times the ship's length if tug assistance is present. Without tugboats, three times the ship's length is recommended. The Spanish guidelines for turning basins for seagoing vessels
(2025). 9788488975393, Puertos del estado. .
provide very specific dimensions for different types of manoeuvres that may occur at a turning basin in a seaport.


Examples

See also

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