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<br />e <br /> <br />. <br /> <br />; <br /> <br />e <br /> <br />;. <br /> <br />I <br /> <br />'l: <br /> <br />e <br /> <br />LIST OF SYMBOLS <br /> <br />A - Area of flow prism, sq. ft. <br /> <br />B = Bottom width of trapezoidal channel, ft. <br /> <br />D <br /> <br />. <br />= Width of semicircular channel in bottom of <br />trapezoidal channel, ft. <br /> <br />D50, D85 = Particle size of gradation, of which 50 percent, <br />85 percent, etc., of the mixture is finer by <br />weight, ft. <br /> <br />d <br /> <br />= <br /> <br />Depth of flow in channel, ft. <br /> <br />dadj <br />d <br />max <br /> <br />= <br /> <br />Adjusted depth of flow, ft. <br /> <br />= <br /> <br />Maximum permissible depth of flow for a particular <br />lining, channel slope, and soil erodibility, ft. <br />If ~x is exceeded, it is likely that damage to <br />the channel will occur. <br /> <br />Kr <br /> <br />= <br /> <br />Ratio of maximum shear on sides of trapezoidal <br />channel to maximum shear on bottom of trapezoidal <br />channel. <br /> <br />Kz <br /> <br />= <br /> <br />Ratio of critical shear on sides to critical shear <br />on bottom of trapezoidal channel for noncohesive <br />ma,terial. <br /> <br />K3 <br /> <br />= <br /> <br />Ratio of maximum shear stress in bend to maximum <br />bottom shear stress in straight channel. <br /> <br />K' <br />3 <br /> <br />= <br /> <br />K3 value for short bends. <br /> <br />n <br /> <br />Manning flow resistance coefficient. <br /> <br />= <br /> <br />P <br /> <br />= Wetted perimeter of flow prism, ft. <br /> <br />Q <br /> <br />= Flow rate, cfs. <br /> <br />R = Hydraulic radius, Alp, ft. <br /> <br />Rd = Radius of bend measured at mid-point of outer bank. <br />R = R + (T + B) <br />d 0 4 <br /> <br />R <br />o <br /> <br />= <br /> <br />Mean radius of channel center line, ft. <br /> <br />v <br />