The remaining wing revolved as ponderously as a grinding cement mixer as the plane plummeted nose downward in a straight line at accelerating speed until it struck the water, which foamed open at the impact like a white water lily on the dark-blue sea, and washed back in a geyser of apple-green bubbles when the plane sank.
There are no more uses of "white water" in the book.
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We went white water rafting.
Spray struck their faces as they hit the white water.