According to Vermule's formula, the annual run-off(F) in cm is given by -

[Where, R= Annual rainfall in cm, T= Mean annual temperature in °C, and K= A constant]

- 1
  
  F= R+(0.279+0.116 R)(0.063 T-0.47)
- 2
  
  F= R-(0.279+0.116R)(0.063 T+0.47)
- 3
  
  F= R-K(1.8 T+32)
- 4
  
  F= R+K(1.8 T-32)

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