If q is the punching shear resistance per unit area a, is the side of a square footing for a column of side b, carrying a weight W including the weight of the footing, the depth (D) of the footing from punching shear considereation, is

- 1
  
  $D = \frac{W (a - b)}{4 a^{2} b q}$
- 2
  
  $D = \frac{W (a^{2} - b^{2})}{4 a^{2} b q}$
- 3
  
  $D = \frac{W (a^{2} - b^{2})}{8 a^{2} b q}$
- 4
  
  $D = \frac{W (a^{2} - b^{2})}{4 a b q}$

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