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<br />. <br /> <br />Discharge Probabilities. Discharge-probabi1ity relationships <br /> <br /> <br />were developed for several locations in the Bijou Creek basin. The <br /> <br /> <br />curves on Bijou Creek were developed on the basis of a regional <br /> <br /> <br />study of streams in the South Platte River basin. This study <br /> <br /> <br />showed that drainage area was related to the mean annual flood <br /> <br /> <br />through the following regression equation: <br /> <br />LOG Q = A + 0.531 (LOG D.A.); <br /> <br /> <br />where LOG Q = logarithm of mean annual flood, <br /> <br /> <br />A = the regression constant combined with an <br /> <br /> <br />estimate of the unexplained variance charac- <br /> <br /> <br />teristic of the immediate area, (A = 2.12 in <br /> <br /> <br />the Bijou Creek basin) <br /> <br /> <br />0.531 = slope of the regression curve, <br /> <br /> <br />LOG D.A. = logarithm of the contributing drainage area. <br /> <br />This regional study also indicated that the average standard <br /> <br /> <br />deviation for high plains streams in the South Platte River basin <br /> <br /> <br />is 0.60. The average length of record for the streams included in <br /> <br /> <br />the study was 25 years. The computed curves were adjusted for <br /> <br /> <br />partial duration series and expected probability. The resulting <br /> <br /> <br />discharge-probability curves and profiles are shown on plate 67. <br /> <br />PAS IN MlfLIf'lJ STlID I ES <br /> <br />As presented in previous discussion, basin runoff models were <br /> <br /> <br />used in accomplishing the hydrologic studies for the South Platte <br /> <br /> <br />River and tributary streams. Development of the various models <br /> <br /> <br />used and the input parameters employed are presented in the follow- <br /> <br /> <br />ing discussion. <br /> <br />54 <br /> <br />. <br />