If A is the area of the foundation of a retaining wall carrying a load W and retaining hearth of weight $ω$ per unit volume, the minimum depth (h) of the foundation from the free surface of the earth, is

- 1
  
  $h = \frac{W}{A ω} [\frac{1 - \sin ϕ}{1 + \sin ϕ}]$
- 2
  
  $h = \frac{W}{A ω} [\frac{1 - \sin ϕ}{1 + \sin ϕ}]$
- 3
  
  $h = \frac{W}{A ω} {[\frac{1 - \sin ϕ}{1 + \sin ϕ}]}^{2}$
- 4
  
  $h = \sqrt{\frac{W}{A ω}} {[\frac{1 - \sin ϕ}{1 + \sin ϕ}]}^{2}$

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