| Summary: | 碩士 === 國立中興大學 === 水土保持學系 === 87 === Nan Tou situats at central of Taiwan . Because it has many mountains , high density of erosion and geology is brittle , So hillside fields often occur erosion by harmful drainage caused area of 7 ha . By theoretical analyses , investigation , laboratory and field tests , the result were summarized as follow :
（一） Many factors involved in landslide , it includes weak topography , soil erosion and bad surface drainage , That give rise lower region to collapse and cause landslide .
（二） Composited of geological structure and strain’s value and a analysis of landslide depth . It can shows hillside slope stability analysis . If it can strengthen surface drainage and dredge erosion tunnel , calamity does not occur easily .
（三） Many regions have slope stability except toe of landslide is still change . So it must plan prevent treatment and still proceed periodical observation .
（四） Analysis of hydrological information , we have forecast equation as follow :
qi=(2*R*0.24)/(1.0013+3.0011)
R： volume of rainfall per day
qi：volume of groundwater
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