Susan Avis Murphy is an American watercolour artist, her work has been honored with inclusion in many significant exhibitions, such as those of the American Watercolor Society, Allied Artist of America, the National Arts Club, the Butler Institute of American Art, the Southern Watercolor Society, Baltimore Watercolor Society, Rocky Mountain National Watermedia Exhibition, the Adirondack National and many others. 

In this video, she shows her rivulet and lifting techniques. Susan discusses this unusual approach to watercolor and how it can be achieved, in my opinion, it's really amazing. 

The video maybe it's too long, but believe me if I told you that it is worth. I love her rivulet technique!