IDF Formula

The following empirical equation was fitted to the IDF data for 135 major urban centres in Malaysia in Equation 2.2 (in Chapter 2 of MSMA, 2011):







= Average rainfall intensity (mm/hr)

T (Tau) = Average return interval (years) for A.R.I of between 0.5 and 12 months and 2 and 100 years.

= Storm duration (hours) where d is between 5 minutes and 72 hours

 (lambda, kappa, theta, eta) = Fitting constants dependent on the rain gauge location. Refer Table 2.B1 in Appendix 2.B.



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