The term 'WATERY SWIRL' can be described as an EDDY, which is a swirling body of water or air that moves in a circular motion. An EDDY is created when a current of water or air is disrupted by an obstacle, such as a rock or a tree branch. Eddies can also form when two currents of water or air meet and swirl around each other. Eddies are often seen in rivers and streams, and can be used to measure the speed of the current.