15 Mar 2015: an updated version of this blog is available here.
In RORB, in the Design Rainfall specification dialogue, select ‘User defined IFD’ and click ‘Select/Edit IFD file’.
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.