A rectangular footing L x B is to be place at a depth D below ground level such that D/B < 2.5. The factor $N_{c}$ to be used in deciding on the allowable bearing capacity for the footing as given by Skempton is calculated using the equation (where $N_{C_{R}} = N_{C}$ for rectangular footing, $N_{C_{S}} = N_{C}$ at surface)

- 1
  
  $N_{C_{R}} = 1.5 N_{C_{S}}$
- 2
  
  $N_{C_{R}} = [1 + 0.2 \frac{D}{B}] N_{C_{S}}$
- 3
  
  $N_{C_{R}} = [1 + 0.2 \frac{B}{L}] N_{C_{S}}$
- 4
  
  $N_{C_{R}} = [1 + 0.2 \frac{B}{L}] [1 + 0.2 \frac{D}{B}] N_{C_{S}}$

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