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<br />3. The energy loss coefficients due to acceleration or deceleration <br /> <br />of velocity in a contracting or expanding reach of channel are assumed to <br /> <br />be 0 and 0.5, respectively. <br /> <br /> <br />4. The equations should not be used in reaches of stream affected <br /> <br />by backwater. <br /> <br /> <br />5. The hydraul ic radius does not include the wetted perimeter of <br />the individual bed particles. <br /> <br />6. These equations are to be used for relatively clear water streams <br /> <br />having low suspended sediment. <br /> <br />Manning's roughness coefficients at individual sites were as much as <br /> <br /> <br />61 percent higher in expanding subreaches than contracting sub reaches , <br /> <br /> <br />although channel roughness was constant. Additional studies are needed <br /> <br /> <br />to evaluate the interrelation between channel roughness and the con- <br /> <br />traction and expansion coefficients. <br /> <br />/ <br /> <br /> <br /> <br />~ <br />