Fig. 9 shows the calculated FS categories at different soil wetness conditions with the depth of the failure plane at soil depth (Fig. 9a,b) and at the lower boundary of the stagnic horizon (Fig. 9d,e), with p=22° (Fig. 9a,d) and 35° (Fig. 9b,e). We will referto the calculated stability classes resulting from the four combinations as sd_22 and sd_35 (failure plane at soil depth with 22° and 35 ํ) and stag_22 and stag_35 (failure plane at the lower boundary of the stagnic layer with p'= 22 ํ and 35 ํ