Assumptions

Assumptions inherent in the Rational Method are as follows:

 

  1. The peak flow occurs when the entire catchment is contributing to the flow.
  2. The rainfall intensity is the same over the entire catchment area.
  3. The rainfall intensity is uniform over time duration equal to the time of concentration, tc.
  4. The ARI of the computed peak flow is the same as that of the rainfall intensity.

 

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