WATER LINE

(Nautical) (1) The line on the hull of a ship to which the surface of the water rises. (2) Any of several lines parallel to this line, marked on the hull of a ship, and indicating the depth to which the ship sinks under various loads. (3) A pipeline carrying water. (4) A line marked on a structure or gage to indicate water depth. May be more specifically referred to as a high water line or a low water line when measuring water depths.