Abstract
The authors proposed an estimation model of groundwater level which is able to be used when the basal groundwater level is already clarified and duration of precipitation is longer than ti. This model definition is as follows:
γ= (κ·i·β/l) ·Δh+α where t1 is concentration time of groundwater from top of the catchment area to the observation point, γ is the precipitation density, κ is coefficient of permeability, i is hydraulic gradient, β is effective porosity, l is length of the catchment area, Δh is groundwater ascent volume, α is invalid precipitation density.
Moreover, for the purpose of making to be sure the propriety of this model, we examined this model through the Taninouchi landslide, Kochi prefecture and Kuchisakamoto landslide, Shizuoka prefecture.
