Docks and Harbor Engineering
In a two lane channel, bottom width of channel is given by

Manoeuvring lane + (2 × Bank clearance lane) + ship clearance lane
(2 × Manoeuvring lane) + (2 × Bank clearance lane + ship clearance lane)
Manoeuvring lane + (2 × Bank clearance lane)
(2 × Manoeuvring lane) + (2 × Bank clearance lane)

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