For cohesive soils, the height of the retaining wall for zero active earth pressure will be

[c= Cohesion value of soil, $γ$ = Density of the soil, $ϕ$ = Angle of internal friction]

- 1
  
  $\frac{c}{γ} \tan (45^{0} + \frac{ϕ}{2})$
- 2
  
  $\frac{2 c}{γ} \tan (45^{0} + \frac{ϕ}{2})$
- 3
  
  $\frac{3 c}{γ} \tan (45^{0} + \frac{ϕ}{2})$
- 4
  
  $\frac{4 c}{γ} \tan (45^{0} + \frac{ϕ}{2})$

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