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<br />The average particle velocity in the Xc reach is as follows (Eq. (24)): <br /> <br />v <br />c <br /> <br />= 1.49 Sl/2 <br />n <br /> <br />(D ) 2 /3 <br />c <br /> <br />= 1.49 (0.0008)1/2 (13.83)2/3 = 5.24 ft/s <br />0.045 <br /> <br />The Froude number developed by the floodwave is determined by the <br />following equation (Eq. (24)): <br /> <br />F <br />c <br /> <br />= <br /> <br />v <br />c <br /> <br />5.24 <br /> <br />.rgo <br />c <br /> <br />,132.2 (13.83) <br /> <br />0.25 <br /> <br />= <br /> <br />Because (Qb < <br />max <br />is given by Eq. (25), <br /> <br />Q ), the average cross-sectional area (A ) of the wave <br />v c <br />i.e.: <br /> <br />A = K(6h )m D = 81.75 (0.95(26.49))0.82 <br />c m c <br /> <br />2 <br />(13.83) = 16158 (ft ) <br /> <br />* <br />The volume parameter (V )is as follows (Eq. (27)): <br /> <br />* <br />V <br /> <br />VOL <br />r <br />= <br />A X <br />c c <br /> <br />8750 (43560) <br />= <br />(16158) (20600) <br /> <br />= 1.15 <br /> <br />To check the original estimate for 6, the family of curves for <br />Fc = 0.25 is examined to find by interpolation the ratio of Qp/~ax for <br />* * <br />(V = 1.15) at (X = 1). This ratio is found to be approximately 0.60, <br />indicating that the peak flow at X is <br />c <br /> <br />Qp at Xc = (Qp/Qb ) (Qb ) = 0.60 (95800) = 57480 cfs <br />max maX <br /> <br />Because this peak flow is less than Qv (Eq. (7)), the depth reached by <br />the floodwave at Xc is given by Eq. (8) as follows: <br /> <br />1-27 <br />