In recent years, the frequency of heavy rain is increasing in Japan. Even if it is a stable slope until now, many of slopes will become unstable by the increase in heavy rain in the future. In some cases of landslides in the reservoir area near the dam, the hydraulic bore is caused by slope failure in the reservoir, As a result, there is a risk that hydroelectric facilities may be damaged. In addition, the development of sedimentation of the reservoir by landslides is concerned. In this paper, evaluation of the landslide risk of slope in the dam reservoir area is described taking into account the seepage of rainfall into the slope of drainage basin. The slope stability is evaluated, using the digital elevation model (=DEM) of entire drainage basin and its infiltration into the slope. In particular, we analyzed the effect of mesh size of DEM for the evaluation.

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