1.  Riffle | Definition of Riffle by Merriam-Webster
     https://www.merriam-webster.com/dictionary/riffle
     Kids Definition of riffle ... 1 : to move lightly Wind riffled the bird's feathers. 2 : to look through quickly I riffled through a
     magazine.

 2.  Riffle - Wikipedia
     https://en.wikipedia.org/wiki/Riffle
     A riffle is a shallow landform in a flowing channel, and it has specific topographic, sedimentary, and hydraulic
     indicators.

 3.  Riffles, runs and pools - LakeSuperiorStreams
     https://www.lakesuperiorstreams.org/understanding/riffle_run_pool.htm
     Riffles are shallow with fast, turbulent water running over rocks. Runs are deep with fast water and little or no turbulence. When a stream meets up with a
     huge ...

 4.  Riffles - USDA Forest Service
     https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb5042807.html
     This part of the stream is a riffle. Riffles are the shallower, faster moving sections of a stream. Look for areas with a fast current where rocks break
     the ...

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