The regression equations that are used to estimate flow statistics for ungaged sites were developed using computed streamflow statistics and measured basin characteristics for a selected group of streamgages, in other words, a small sampling of streamgages. These small samplings cannot capture all of the variability in a region.
In a series of estimated flow statistics for an ungaged site, such as peak-flows at various recurrence intervals or flow-duration statistics, why do I sometimes get estimates for lower flows that are higher than estimates for higher flows?
By StreamStats