If $P k g / m^{2}$ is the upward pressure on the slab of a plan concrete footing whose projection on either side of the wall is a cm, the depth of foundation D is given by

- 1
  
  $D = 0.00775 a \sqrt{P}$
- 2
  
  $D = 0.0775 a \sqrt{P}$
- 3
  
  $D = 0.0775 a \sqrt{P}$
- 4
  
  $D = 0.775 P \sqrt{a}$

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