Abstract
Residual pore water pressure due to drawdown of reservoir influence on safety of reservoir limb landslide. This paper propose a method on estimation of residual pore water pressure and apply of it. I investigate the behavior of residual pore water pressure of 16 landslides. I examine non-saturated permeability properties of landslide and apply non-saturated seepage analysis. And then I apply this method to landslide (rock slide) of high permeability befor filling, and estimate residual pore water pressure of it rationally.