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<br />The available guidelines for selecting roughness coefficients for <br /> <br /> <br />steep-gradient streams are based on limited verified roughness data, and <br /> <br /> <br />equally important, are handicapped by a lack of easily appl ied methods <br />for evaluating the changes of roughness with depth of flow. Streams <br />flowing on steeper gradients generally have shallower depths of flow and <br />larger bed materials that affect the flow resistance more than the bed <br />materials in flatter slope streams having larger flow depths. However, <br />very few studies provide the practicing engineer with data on the rough- <br />ness characteristics of steep-gradient streams. Only a few studies have <br /> <br /> <br />been made of the hydraulics of steep-gradient channels. Judd and Peterson <br /> <br /> <br />(1969), Bathurst and others (1979), and Peterson and Mohanty (1960) have <br /> <br /> <br />been primarily theoretically oriented or concerned with methods to <br /> <br /> <br />evaluate average flow velocity. <br /> <br />I <br /> <br /> <br />/1 <br />