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The purpose of this study is to identify appropriate
probability distributions for the annual maximum precipitation
of various duration at ninety-two recording rain gauging
stations in Taiwan .The method used in the frequency analysis is
the L-moment method along with various goodness-of-fit
procedures. Also, this study aims at developing a non-
dimensional rainfall intensity-duration-frequency (IDF)
equations based on a rainfall intensity with 25-year return
period and 1-hour duration.To enhance the accuracy of the
regional analysis, the cluster analysis was applied using the
parameter in the IDF equation and geographical coordinates of
each station. It is found the 92 raingage stations can be
clustered separated by into two areas separated by the line
connecting ({EMBED Equation |} E , {EMBED Equation |} N) and
({EMBED Equation |} E , {EMBED Equation |}N), as the
demarcation.In the regional analysis, empirical relationships
for each groupwere developed to relate each parameter in the IDF
equation to the mean annual precipitation and elevation. The
regional equations for the parameters in the IDF equation can be
used to estimate extreme precipitation characteristics at
locations where there is no precipitation record.
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