WRS-79
A Guide for Estimating Floods of Various Frequencies for Ephemeral Streams in the Plains Area of Northeastern Wyoming
Abstract
Equations were developed to estimate the size of floods for various
recurrence intervals at ungaged sites on ephemeral streams in the
plains area of northeastern Wyoming. Log-log transformation of the
mean and standard deviation of the flow logarithms at gaged sites
were used as dependent variables. A regional weighted value of skew
was applied to the study area. The logarithms of the drainage area,
basin perimeter and main channel length were used as independent
variables. In addition to these basin characteristics, three combined
factor variables were found to be significant in the prediction equations
and were also used as independent variables. The standard error
of estimate for the mean value equation was 18.6 percent, and for
the standard deviation value was 27.8 percent. Basins studied ranged
in size from 1.60 to 535 mi2 .
A regionalized flood frequency prediction model was developed
for use in northeastern Wyoming which provides flood peak flow values
needed for various hydrologic design criteria.
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