Fig. 5. (a) Applied rainfall and computed discharge, computed (b) pore water pressure at the observation point, (c) safety factor, and (d) water content for Cases 1, 2, and 3. The numbers in each figure represent the numbers of cases. The observation point of pore water pressure is shown in Fig. 3. Black circles in Fig. 5 (c) and (d) indicate the times when Fs < 1.