IDF Formula

 
 

In Equation 13.2 of Chapter 13 in MSMA (2000), the following polynomial equation was fitted to the published IDF curves for the 35 major urban centres in Malaysia:

 

 

 

where,

  = the average rainfall intensity (mm/hr) for ARI,  R and duration t

R   = average return interval (years)

t    = duration (minutes)

a to d are fitting constants dependent on ARI.

 

 

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