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<br />! <br /> <br />17 <br /> <br />Method 11 applies to conditions of unequal travel lengths between <br /> <br />. <br /> <br />sections and to variations of hydraulic characteristics across the width <br /> <br />. <br /> <br />of the channel. Calculations are identical to Method 1 except for the <br /> <br />calculation of friction losses. Total friction loss between adjacent <br /> <br />. <br /> <br />stations is computed by considering discharge for each segment and a <br /> <br />K11 for each segment computed as: <br />s <br /> <br />Kll <br />s <br /> <br />1.486 11 R 2/3 <br />s S <br />n L 1/2 <br />S S <br /> <br />where L = length of reach for that segment. <br />s <br /> <br />Total friction loss is then computed as: <br /> <br />Qs 2 <br />hf = ~ (KIT) <br />s <br /> <br />The energy balance is then carried out in the same manner as in <br /> <br />. <br /> <br />Method 1. Both of these methods represent a refinement of the Standard <br /> <br />Step Method as they divide the flow into separate segments which behave <br /> <br />differently due to channel conditions. <br /> <br />The Bureau of Reclamation's Methods A and B respectively apply to <br /> <br />the same conditions as the USCE Methods 1 and 11. Computation is <br /> <br />similar to the Corps Methods, although somewhat shorter. Calculations <br /> <br />are shortened by solving for friction slope directly, as in the <br /> <br />Standard Step Method, whereas the USCE Method involves a trial and <br /> <br />error process for proper slope selection. <br /> <br />Computeri~ed Solutions for Water Surface Profiles <br /> <br />. <br /> <br />Due to the repetitiveness in water surface profile calculations, <br /> <br />some of the methods mentioned have been adapted for solution by <br />