The pools and riffles form sequences spaced at a repeating distance of about five to seven widths of the channel. Pools are most easily seen in a meandering stream where the outer edge of each meander loop is deep and undercut riffles form in the shallow water of the short, straight, wide reaches between adjacent loops. cockle ripple ruffle undulate a small wave on the surface of a liquid (noun) Synonyms. flick flip leaf riff thumb stir up (water) so as to form ripples (verb) Synonyms.
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