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<br />8 <br /> <br />The outline of work is as follows: <br /> <br />1. Transform the list of N annual flood magnitudes Y 1, <br />Y2, . . . . , YN to a list of corresponding logarithmic <br />magnitudes Xl, X2, . . . . , XN. <br /> <br />2. Compute the mean of the logarithms: <br /> <br />M = <br /> <br />LX <br />N <br /> <br />3. Compute the standard deviation of the logarithms: <br /> <br />8 <br /> <br />= -./~ <br />VN-l <br /> <br />= '" / L x2 - (LX)2 / N <br />V N - l <br /> <br />4. Compute the coefficient of skewness: <br /> <br />g = <br /> <br />NLx3 <br />(N - l)(N - 2)83 <br /> <br />= IF LX3 - 3N LX LX2 + 2( LX)3 <br />N(N - l)(N - 2)83 <br /> <br />5. Compute the logarithms of discharges at selected re- <br />currence intervals or percent chance: <br /> <br />log Q = M + K S <br />