WWRC 96-05
Analysis of Wyoming Extreme Precipitation patterns and Their Uncertainty for Safty Evaluation of Hydraulic Structures
Abstract
This study contains two major tasks. The first task is concerned with the identification
of representative significant storm patterns in Wyoming. Significant storms refer to those
events with the total depth equal to or greater than that of a IO-year storm. The method
employed was cluster analysis. Contingency tests were performed to examine the dependency
of the occurrence of storm patterns on the climatic region, storm duration, and seasonality.
Parametric models were used to fit storm patterns. The second task is the development of
procedures to stochasticaBy generate storm patterns. Three methods based on the
multivariate Johnson system are proposed. An additional issue addressed under this task is
the selection of alternative normal transformations with favorable small sample qualities. Four
such procedures are proposed and their performance is examined.
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