A slope is to be constructed at an angle of $30 °$ to the horizontal from a soil having the properties, $C = 15 k N / m^{2}; ϕ = 22.5 °; y = 19 k N / m^{3}$ . Taylor's stability number 0.046. If a factor of safety (with respect to cohesion) of 1.5 is required, then the safe height of the slope will be

- 1
  
  25.8 m
- 2
  
  19.1 m
- 3
  
  17.2 m
- 4
  
  11.5 m

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