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<br />APPENDIX I I.--NOTATION <br /> <br />The following symbols are used in this paper: <br /> <br />A = channel cross-sectional area; <br />D = mean depth of flow or hydraulic.depth; <br />d = the intermediate particle diameter that equals or exceeds that of <br />n <br />n percent of the particles by count; <br />F = Froude number; <br /> <br />g = acceleration due to gravity; <br /> <br />h = <br /> <br />hf = <br /> <br />h <br />v <br />K = <br /> <br />k = <br /> <br />elevation of the water surface at a cross section; <br /> <br />energy loss due to boundary friction in the reach; <br /> <br />= velocity head at a cross section; <br /> <br />cross-section conveyance; <br />a coefficient for a contracting <br /> <br />or expanding reach; <br /> <br />L = length of reach; <br />M = cross-section number; <br /> <br />m = Manning's roughness coeffi c i ent factor fnr a meandering char.nel; <br />n = Manning's roughness coeff i c i ent for a .straight uniform smooth channel; <br />n1 = Manning's roughness coefficient factor for cross.section irregularities; <br />n2 = Manning's roughness coefficient factor for channel variations; <br />n3 = Manning's roughness coeff i c i ent f ac to r for obstructions; <br />n4 = M.ann i ng' s roughness coefficient factor for channel vegetat ion; <br />nT = total flow resistance in a channel reach; <br />Q = discharge or flO'.v; <br />R = hydraulic radius; / <br /> <br />Gs <br /> <br /> <br />s = energy gradient or friction <br />S = water surface slope; <br />w <br />V = mean velocity of flow; <br />v = point velocity of flow~ <br />y = depth of flow; <br />y = observation depth of flow; <br />Z = AR2/3. <br /> , <br /> <br />slope; <br /> <br />Vo.6 : ~ ~ J -tC'. b 6t, kp.fl ; <br />\10:(.+ 0.'6 : tL.;.:ii, (Vi o. "Z. --J 0, ~ ~ ~ <br /> <br />a = alpha, the velocity head coefficient; <br />~ = summation. <br />