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<br />(32572) 1/2.53 __ <br />h12.3 = 23.12 17.49 <br /> <br />To determine the time to flooding (floodwave reaching flood stage), the <br />flow, Qf' associated with the flood stage, hf, (10 ft) must be computed. <br /> <br />Qf = a(h~b = 23.12 (10) 2.53 <br /> <br />. <br /> <br />Qf = 7834 ds <br /> <br />;; <br /> <br />This value for Qf is substituted into Eq. (38) to calculate time to <br />flooding, tfld, as follows <br /> <br />tfld = tp - (~: = ~:) tf <br /> <br />(32572 <br />= 4.54 - 32572 <br /> <br />- 7834) <br />5000 <br /> <br />(0.75) <br /> <br />tfld <br /> <br />= 3.87 hours <br /> <br />The time at which the flooding ceases (floodwave drops below flood <br />stage is calculated using Eq. (39), i.e., <br /> <br />.. <br /> <br />td = t + [24.2 VO~ _ ] Cp - Qf) <br /> p Q _ Q tf Qp - Qo <br /> p 0 <br /> [ 24.2 (8750) 0'75J ( 32572 - 7834 ) <br /> = 3.54 + (32572 - 5000) (32572 5000) <br /> <br />td = 10.76 hours <br /> <br />- <br />Routing the flow to mile 40.5 requires the fitting of K and m <br /> <br /> <br />parameters to the distance weighted average cross section for the reach. <br /> <br /> <br />The reduced cross-sectional data for the reach is given in table 6. <br /> <br />1-31 <br />