Rational Method Formula

Rational Method is covered in Chapter 2 of MSMA (2011).

 

In MSMA (2011), the peak discharge is related to the rainfall intensity and catchment area via the Rational Method:

 

 

where

 

Q         is the peak flow (m3/s)

C         is the runoff coefficient

i           is the average rainfall intensity (mm/hr)

A          is the drainage area (ha)

 

 

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