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- Q392 - Navigation General: Rivers
93. Illustration D037NG below represents a movable dam. If there is high water and the wickets are down so that there is an unobstructed navigable pass through the dam, what light (s) will be shown at D if the lock walls and piers are not awash?
When a movable dam has lowered wickets allowing an unobstructed navigable pass and the lock walls are not awash, a single red light will be displayed at position D to indicate vessels should use the open pass.
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