No one would ever regard the insignificant muddy watercourse that wanders through the eastern suburbs of Melbourne Australia as iconic or mystical. There is nothing of the Ganges or the Thames or the Mississippi about the Yarra. Most people barely notice it's there and those who do tend to disparage its effluence. Yet for the two men who have spent most of their lives keeping the Yarra channels flowing there is a kind of divine power there. From a family tradition of riverboat men identical twin