Question 1858Navigation General

The correct answer is B) outdraft. An outdraft is a current that moves across the entrance of a lock toward the river or toward the dam. This current is created by the water flowing out of the lock as it is emptied or as water is drawn from the lock to the river or dam. The other options are incorrect: A) Lockwash refers to the turbulent water flow inside the lock chamber, not at the entrance. C) Springpool and D) Cutoff are not standard terms used to describe currents at a lock entrance.