What is the applicability of the skew map (Plate I) in Bulletin 17B? What is the maximum watershed drainage area for which it can be used?
The skew map in Bulletin 17B is provided as a convenience for users who do not wish to do the regional analysis needed to develop their own estimates of generalized skew. The use of the skew map should be consistent with the data used to develop it. The map was developed with data from watersheds smaller than 3,000 square miles and with essentially unregulated peak discharges (that differ from natural peak discharges by less than 15 percent). Periods when the annual peak discharge likely differed from natural flow by more than about 15 percent were excluded from the skew-map analysis. Thus, the maps should not be used with regulated flows. The results were presented as a map largely because it was not possible to find convincing relations between skew and basin characteristics or other peak flow statistics. Although basin storage is generally thought to be important, there is no widely accepted empirical or theoretical relation tying basin characteristics to logarithmic skew coefficien
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