In recent years, more frequent extreme rainfall events have led to the uneven temporal-spatial rainfall distribution, which has resulted in the dramatic variation in rainfall intensity, rainfall frequency, and rainfall duration. After the 921 Earthquake in 1999, the hillside soil of Taiwan has been severely loosened. Any typhoon rainfall could triggering debris flows possibly. Therefore, the data of typhoon rainfall observed at 142 rainfall stations in the central region of Taiwan have been used in the hydrologic frequency analysis (according to typhoon rainfall intensity). Five analysis methods are adopted for this research, namely Normal Distribution, Logarithmic Normal Distribution,Extreme-Value TypelDistribution, Pearson Typclll Distribution,and Log-Pearson Typelll Distribution. This research also looks into the plotting rainfall isoline diagrams of debris flowprone streams and return period of rainfall duration in each area in central Taiwan. The influence of typhoon rainfall over the central region of Taiwan is analyzed in this research as well.
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