Statistical Analysis of Extreme Precipitation in Wyoming
This study deals with the regionalization of extreme precipitation m Wyoming. The basic
methodological framework employed is an index-flood type approach in conjunction with the L-moments.
Based on the elevation of rain gauges and sample L-moments of the annual maximum
precipitation for different durations, statistical cluster analysis was applied to obtain an initial region
delineation over the entire State of Wyoming. Adjustment to regions was then made according to
the relationship between the mean annual precipitation and the L-moments of annual maximum
precipitation to obtain a region delineation with better defined boundaries. This report describes the
procedures and presents some results of region delineation.
Another issue addressed in this study is the selection of the underlying regional distribution
for extreme storms in a regional analysis. Here the choice of a probability model for extreme data
is discussed. Several selection techniques were proposed and their performance examined.
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