近年來發生土石流災害的頻率不斷的增加，此係因過量的開發與不當的土地利用嚴重的破壞了山坡地的水土保持，使山坡地產生大量崩塌的鬆散土石。一旦豪雨來臨或颱風挾帶豐沛的雨量，就容易引起土石流災害，嚴重的威脅人民的生命財產安全。
本研究選定雲林縣古坑鄉華山村及南投縣信義鄉豐丘村二區重大土石災害集水區為研究對象。選取該區土石流潛勢溪流鄰近雨量站之颱風降雨事件。進行參考雨量站對其它鄰近雨量站之降雨延時T(hr)、累積雨量R(mm)及最大時降雨量Imax(mm)之比對分析，並分析與鄰近雨量站降雨差異性與雨量站水平距離及高程距離之差異。最後，本研究以降雨驅動指標RTI90來討論綜合評鑑指標 對參考雨量站之鄰近雨量站雨量資料預測結果之好壞作分級與評估。
分析結果顯示降雨時間、累積雨量及最大時降雨量等降雨因子各有其重要性，而華山村所選擇之參考雨量站可以樟腦寮、草嶺、桶頭雨量站為替代雨量站；豐丘村可以青雲、溪頭、望鄉雨量站為替代雨量站。

Recently, the water and soil conservations of hillside areas have been seriously spoiled due to improper developments of land use. These improper developments increase the occurrence frequency of mudslide disasters and collapses. Once the pouring rain or typhoon carry with plentiful precipitation, it will easily drive the disasters of mudslide and collapse and raise the degree of threat to agricultural land and public assets.
The study areas in the present study are Hua-Shan village of Gu-Keng town in Yun-Lin county and Fong-Ciou village of Sin-Yi town in Nan-Tou county, which are the areas of major disasters of debris flow. The heavy rainfall events due to typhoon and the rainfall data of rain-gauges, which are nearby debris-flow-prone streams, were also selected to investigate the mutuality in this study. Following, the rainfall duration T (hr), accumulated rainfall amount R (mm) and maximum hourly rainfall intensity Imax (mm) between the representative rain-gauge station and its surrounding rain-gauge stations were analyzed in this study. The distance and difference of elevation were also discussed in the present study. Lastly, the rain-drove index RTI90 were employed to rate and evaluate the superiority and inferiority of comprehensive evaluation index K on the estimate results from the nearby rain-gauge stations.
The analysis results show that it is critical to use the rain factors, such as the rainfall duration, accumulated rainfall amount, and maximum hourly rainfall intensity, to evaluate the mutuality between the representative rain-gauge station and its surrounding rain-gauge stations. The Zhangnaoliao, Caoling and tongtou rain-gauge stations can be regarded as the substitutional rain-gauge station in Hua-Shan village and also the Chingyun, Shitou and Wangshiang rain-gauge stations in Fong-Ciou village.

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