Abstract
In the River Mibu Basin, it was numerical analyzed to the relation between landslide degradation volume and the factors of rainfall, slope, river density and vegetation.
For this study, 500M Grid was covered on the River Mibu Basin, and these factors were surveyed in every grid field.
We expressed the relation by function, and obtained the function of coefficient.
Using this function, we can be forecast some landslide degration volume according to rainfall in the area.
