riffle

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riffle

US and Canadian
a. a rapid in a stream
b. a rocky shoal causing a rapid
c. a ripple on water
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

riffle

[′rif·əl]
(hydrology)
A shallows across a stream bed over which water flows swiftly and is broken into waves by submerged obstructions.
Shallow water flowing over a riffle.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.