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A 5 m deep canal has side slope of 1:1. The properties of soil are c = 20 kN/m$^{2}$, $\phi_{u}=10^{\circ}$, e=0.8 and G=2.8.

If the Taylor’s stability number is 0.108, determine the factor of safety with respect to cohesion when the canal runs full. Also find the same in case of sudden draw down, if Taylor’s stability number for this condition is 0.137.