A canal having a depth of 6m, is to be excavated through a soil with c = 15 kN/m2, e = 0.9, Ø = 20o and G = 2.67. The side slope is 1 in 1. The factor of safety, If the canal is rapidly emptied, is
| \(\phi^o\) | stability number(Sn) |
| 6 | 0.108 |
| 12 | 0.114 |
| 18 | 0.127 |
| 24 | 0.141 |
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