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Found Riffle 1 time.

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1. Riffle
* Shallow section of a stream or river with rapid current and a surface broken by gravel, rubble or boulders. (Compare glide ; rapid s; run .) * A reach of stream in which the water flow is rapid and usually more shallow than the reaches above and below. Natural streams often consist of a succession of pools and riffles. (Sometimes incorrectly referred to as a "ripple.")

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