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What is the basis for giving greater weight to station skew when the generalized and station skew differ by more than 0.5 (page 15 Bulletin 17B)?

April 26, 2017basis differ generalized giving greater page skew station weight

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What is the basis for giving greater weight to station skew when the generalized and station skew differ by more than 0.5 (page 15 Bulletin 17B)?

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Bulletin 17B work group members felt that large deviations between generalized and station skew may indicate that the flood frequency characteristics of the watershed of interest are different from those used to develop the skew map. It is thought that station skew is determined by rainfall skew and basin storage and that there is considerable variability of response among different basins with similar observable characteristics, in addition to the random sampling variability in estimating skew from a short record. Therefore, it is considered more reasonable to give greater weight to station skew, after due consideration of the data and flood-producing characteristics of the basin. The difference of 0.5 was chosen based on engineering judgement and considering that the standard error of the Bulletin 17B skew map is 0.55.