Table 1.

The slope failure rates due to a poor drainage system during their lifetimes.

Reinforced Slope	No. of Failures	Exposure Time (Hours)
1	10	157,180
2	7	297,240
3	5	139,760
4	1	209,140
5	0	104,819
6	4	262,480
7	11	175,200
8	4	113,860
9	2	254,180