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<br />SUMMARY AND CONCLUSIONS <br /> <br />Hydraul ic calculations of the flow in channels and overbank areas <br /> <br />of flood plains require an evaluation of roughness characteristics. <br /> <br />Most commonly, Manning's roughness coefficient is used to describe the <br /> <br />flow resistance or relative roughness of a channel or overbank area. <br /> <br />Total channel flow resistance depends on the bed roughness, cross- <br /> <br />section irregularities, channel variations, obstructions, vegetation, <br /> <br /> <br />channel meandering, and other factors. Available guidelines for select- <br /> <br /> <br />ing the roughness coefficients of steep-gradient streams have not been <br /> <br /> <br />verified. An investigation was conducted to provide data and to develop <br /> <br /> <br />methods for estimating the Manning roughness coefficient of steep- <br /> <br /> <br />gradient streams and to provide additional information on their hydraulic <br /> <br /> <br />characteristics. <br /> <br />I <br /> <br />~ <br />