When the coefficient of rugosity is increased from 0.01 to 0.02, the gradient of pipe of a given diameter to carry the same flow at the same velocity will be

- 1
  
  increased by 4 times
- 2
  
  increased by 2 times
- 3
  
  decreased by $\sqrt{2}$ times
- 4
  
  decreased by 4 times

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