Water Profile

the cross section of a current.

The water profile has a live profile—that part of the water profile in which the velocity of the current is greater than the threshold of sensitivity of instruments used to determine the flow of water—and dead space—that part of the water profile in which the velocity is less than the threshold of sensitivity of the instruments. When there is an ice cover, the water profile includes the full area of the cross section of flow minus the area of submerged immovable ice (surface and underwater).