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<br />Sites 2 and 4 in the upper South Platte River basin were not included <br /> <br />in the regression analysis because the rainfall flood characteristics were <br /> <br />not considered similar since the sites are in the rain shadow of a large <br /> <br />topographic barrier. These sites plot far to the right of the other data <br /> <br />and the regressions as shown in Figure 8b. <br /> <br />The equations for estimating flood magnitudes at the 2-, 10-, 50-, <br /> <br />100-, and 500-year recurrence intervals are presented below: <br /> <br />QR2 = 36.9 (AB8)0.61 SE = 100 r = 0.74 (3) <br />QRIO (AB8)0.75 SE = 51 r = 0.92 (4) <br />= 111 <br />QR50 231 (AB8)0.83 SE = 42 r = 0.95 (5) <br />= <br />QR100 = 302 (AB8) 0 . 86 SE = 44 r = 0.95 (6) <br />Q\oo = 533 (AB8)0.92 SE = 62 r = 0.92 (7) <br />where <br />AB8 = the drainage area below 8,000 feet (2,438 meters), in <br /> square miles; <br />(SE) = standard error of estimate, in percent; <br />r = the correlation coefficient associated with each equation. <br /> <br />//.; <br />