Whitewater, usually spelled white water in both American and British English, is formed in a rapid, when a river's gradient increases enough to disturb its laminar flow and create turbulence, i.e. form a bubbly, or aerated and unstable current; the frothy water appears white. The term is also used loosely to refer to less turbulent but still agitated flows.
The term "whitewater" also has a broader meaning, applying to any river or creek itself that has a significant number of rapids. The term is also used as an adjective describing boating on such rivers, such as whitewater canoeing or whitewater kayaking.
Read more about Whitewater: Rapids, Classification of Whitewater, Features Found in Whitewater, Whitewater Craft, Safety