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<br />A W A Team Site-Specific PMP Values <br /> <br />The following PMP values were computed in this study. <br /> <br />Cherry Creek Basin Average PMP values <br />24-hour <br />AWAstudy 15.8 inches <br /> <br />72-hour <br />17.4 inches <br /> <br />The A W A study computed only basin average rainfall amounts. It is <br />useful to compute lO-square mile values since they approximate point rainfall <br />amounts. The basin average values from this study are adj usted to 10-square <br />mile values using the within storm curves for Colorado storms. <br /> <br />Cherry Creek 10-square mile PMP values <br />24-hour <br />A W A study 24.7 inches <br /> <br />72-hour <br />27.2 inches <br /> <br />Comparison of A W A Team PMP with the 1995 NWS PMP Values <br /> <br />Cherry Creek Basin Average PMP values <br />24-hour <br />15.8 inches <br />21.1 inches <br />25% lower <br /> <br />72-hour <br />17.4 inches <br />24.7 inches <br />30% lower <br /> <br />AWAstudy <br />NWS study <br />Difference <br /> <br />Cherry Creek 10-square mile PMP values <br />24-hour <br />24.7 inches <br />27.0 inches <br />9% lower <br /> <br />72-hour <br />27.2 inches <br />30.5 inches <br />II % lower <br /> <br />AWAstudy <br />NWS study <br />Difference <br /> <br />By not applying the + 10% "k-factor" rainfall increase, the NWS <br />10-square mile rainfall amount would be almost identical to the A W A team <br />10-square mile rainfall amount. <br /> <br />NWS study without "k-factors" <br />A W A team study <br /> <br />24-hour <br />24.5 inches <br />24.7 inches <br /> <br />72-hour <br />27.7 inches <br />27.2 inches <br /> <br />However, the "k-factor" alone does not account for the differences in <br />the basin average PMP values. <br /> <br />9 <br />