A backlash below a lock is defined as __________.
Official USCG Answer & Rule Citation
Correct Answer: Option A — an eddy working along the lower guide wall
A backlash is a localized eddy current that forms along the lower guide wall of a lock. It is caused by the interaction of the main river current with the lock structure. Mariners must account for this phenomenon when maneuvering to avoid being pushed against the wall or out of position.
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