Using new IFD data in RORB

15 Mar 2015: an updated version of this blog is available here.

RORB has the 1987 IFD values built in (from Australian Rainfall and Runoff).  Here I show how the 2013 IFD values can be used.

You can get both the 1987 and the 2013 IFD data from the Bureau of Meteorology.  Click through the to design rainfall on the water information page or here.

In RORB, in the Design Rainfall specification dialogue, select ‘User defined IFD’ and click ‘Select/Edit IFD file’.

Design rainfall specification

Design rainfall specification

The ‘User Defined IFD Data’ dialogue will appear where you can enter the 2013 IFD values.


You will need to convert the 2013 values to mm/h (mm per hour) first.  The 1987 IFD values are in mm per hour but the 2013 IFD values are in mm.  

Consider an example for Boggy Creek.  The catchment centroid is at about 37.75 S, 146.3 E.  From the BoM website, the IFD data is shown below.  This can be entered in the RORB.

2013 IFD data for Boggy Creek

2013 IFD data for Boggy Creek

5 thoughts on “Using new IFD data in RORB

  1. Kathy

    Good tutorial Tony. I also noticed that when you use user-defined IFD you can’t use the automatic Areal Reduction Factors in RORB, so you need to manually apply ARFs if you need them before you paste in the intensities.

  2. david

    Hi Tony
    to convert IFD 1987 to 2013 in mm/hr,
    eq: AEP 1% (duration 5 min) = 15.4mm -> 15.4 / (1/60) = 924mm/hr. Is it correct?


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