The Whitewater reference article from the English Wikipedia on 24-Apr-2004
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Whitewater

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This page discusses whitewater rapids. For the alleged scandal involving the former US President Bill Clinton, see Whitewater scandal.
whitewater on the river Guil (French Alps)
Whitewater is formed in a rapid, when a river's gradient drops enough to form a bubbly, or aerated and unstable current.

These days the term has a broader meaning applying to any river or creek that has a significant number of rapids and the term is also used to specify a kind of kayaking, canoeing or rafting on these rivers. Ex. One of his hobbies is whitewater kayaking.