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<br /> <br />Recompute <br />statistics <br />without low <br />outliers <br /> <br /> <br />Yes <br /> <br />Recompute statistics <br />adjusted for <br />historic peaks! <br />high outliers <br /> <br /> <br />G<-OA <br /> <br />Yes <br /> <br /> <br />G>OA <br /> <br /> <br />Recompute statistics <br />adjusted for <br />historic peaks/ <br />high outliers <br /> <br /> <br />Yes <br /> <br />Recompute <br />statistics <br />without low <br />outliers <br /> <br />Figure 1. General flow chart for Bulletin 17B flood-frequency computations (modified from Interagency Advisory <br />Committee on Water Data, 1982). <br /> <br />PEAKFQ <br /> <br />-OASGSOA <br /> <br />No <br /> <br /> <br />No <br /> <br />Recompute <br />statistics <br />without low <br />outliers <br /> <br />Conditional <br />probability <br />adjustment <br /> <br />Detennine weighted skew <br />Compute final frequency curve <br />Compute confidence limits <br />Compute expected probability curve <br /> <br />~ <br /> <br />4 <br /> <br />DRAFT - 1/30/98 <br />