According to Rankine's formula, minimum depth of foundations, is

- 1
  
  $\frac{P}{w} \times {(\frac{1 + \sin ϕ}{1 - \sin ϕ})}^{2}$
- 2
  
  $\frac{P}{w} \times {(\frac{1 - \sin ϕ}{1 + \sin ϕ})}^{2}$
- 3
  
  $\frac{P}{2 w} \times {(\frac{1 - \sin ϕ}{1 + \sin ϕ})}^{2}$
- 4
  
  $\frac{P}{w} \times (\frac{1 + \sin ϕ}{1 - \sin ϕ})$

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