Transcription of 3.2.2 Rational Method - CECALC.com
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3.2.2 Rational Method - CECALC.com
3-5 Rational Method One of the most commonly used equations for the calculation of peak flow from small areas is the Rational formula, given as: Q = (CIA)/Ku (3-1) where: Q = Flow, m3/s (ft3/s) C = Dimensionless runoff coefficient I = Rainfall intensity, mm/hr (in/hr) A = Drainage area, hectares, ha (acres) Ku = Units conversion factor equal to 360 ( in English Units) Assumptions inherent in the Rational formula are as follows:(6) Peak flow occurs when the entire watershed is contributing to the flow. Rainfall intensity is the same over the entire drainage area. Rainfall intensity is uniform over a time duration equal to the time of concentration, tc.
3-5 3.2.2 Rational Method One of the most commonly used equations for the calculation of peak flow from small areas is the Rational formula, given as:
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