Don't know, anythings possible but would think the areas these guys are in make getting upstream in your kayak to start is not a simple feat.
In Western Canada we prefer a certain blend of silliness and danger in our races so... https://www.bing.com/videos/search?...8531F926DEBCB29F7B308531F926DEBCB29&FORM=VIRE If you don't want to click that link, I am referring to Bathtub Racing.