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<br />15.24 - <br /> <br />(5.08)(11.87) <br />4 <br />(5.08)2 <br />4 <br /> <br />= 0.78 <br /> <br />m = <br /> <br />6.67 - <br /> <br />Log K 11487 - 0.78 (5.~8J 1.98 <br /> <br />K 10 log K 95.76 <br /> <br />To calculate the maximum depth at the dam, the value of Qv must first be <br /> <br /> <br />determined using Eq. (7). The channel bottom slope immediately downstream <br /> <br /> <br />of the dam, S, is determined from the X-sectional data, i.e., <br /> <br />S <br /> <br />(5532 - 5483) <br />(12.3) (5280) <br /> <br />= 0.0008 <br /> <br />and the Manning roughness coefficient, n, for the downstream channel is <br />estimated to be 0.045. <br /> <br />Thus Q is calculated as follows: <br />v <br /> <br />1/2 ( ) <br />Q = 1.49 (.0008) 95.76 <br />v .045 (0.78 + 1)5/3 <br /> <br />(30) (0.78 + 5/3) = 136976 ds <br /> <br />Because Qv is greater than Qbmax (95800 cfs), Eq. (8) is used to determine <br />h . <br />maxt l.e., <br /> <br />1.49 1/2( <br />a = .045 (.0008) <br /> <br />95.76 )= 33.31 <br />(0.78 + 1 )5/3 <br /> <br />.; <br /> <br />b = 0.78 + 5/3 = 2.45 <br /> <br />h <br />max <br /> <br />95800 <br />33.31 <br /> <br />0/2.45) <br /> <br />h = 25.81 ft <br />max <br /> <br />1-11 <br />