Friends of the Creeks
http://www.friendsofthecreeks.org/articles/creek_structure.shtml
WEBFalls, cascades, rapids, and riffles are important for creek health because they oxygenate the water. A healthy creek has all of the last four types of flow – riffles, runs, glides, and pools. Absence of riffles has a bigger impact on creek health than absence of one of the other types. A variety of flow types is important for the usual ...
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