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<br />n, sample size from normal population of flood logarithms <br /> <br />Pill' probability plotting position of the moth ranked observed peak <br /> <br /> <br />Po, estimated probability of exceeding the flood base <br /> <br />p, exceedance probability <br /> <br />p' , normal exceedance probability corresponding to k , <br />p <br />Q, conditional frequency curve describing only those peaks above a base <br /> <br />Q" , intermediate unconditional frequency curve <br /> <br />0, final Bulletin 17B-estimated frequency curve <br /> <br />QH' historical threshold streamflow <br /> <br />Qo' flood base streamflow <br />Os' systematic frequency curve <br /> <br />S, sample logarithmic standard deviation <br /> <br />S, Bulletin 17B standard deviation <br /> <br />S, historically-weighted logarithmic standard deviation <br /> <br />- ~* ~* -* <br />S', standard deviation of frequency curve passing through Q 0.50, Q 0.10, and Q 0.01 <br /> <br />tn _ I, P , student's t with n-l degrees of freedom and exceedance probability p <br /> <br />W, weight given to systematic peaks <br /> <br />X' , logarithmic magnitudes of historic peaks and high outliers <br /> <br />X, sample logarithmic mean <br /> <br />X, logarithmic magnitudes of systematic peaks between Qo and QH <br /> <br />ex, confidence limit <br /> <br />y, population skew coefficient <br /> <br />~, population mean <br /> <br />cr, population standard deviation <br /> <br />Note: All symbols and explanations from Interagency Advisory Committee on Water Data (1982) and Lepkin and <br /> <br />others (1979). <br /> <br />PEAKFQ <br /> <br />vi <br /> <br />DRAFT. 1/30/98 <br />