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About the New IFDs
The new Intensity-Frequency-Duration (IFD) design rainfalls provided here are based on a more extensive database than the old IFDs, with nearly 30 years’ additional rainfall data and data from 2300 extra rainfall stations.
By combining contemporary statistical analyses and techniques with this expanded rainfall database, the new IFDs provide more accurate design rainfall estimates for Australia.
Note: The new IFDs are part of a larger suite of design flood estimation inputs that are being revised by Engineers Australia and will be released progressively until the end of 2014. Until all components of the Australian Rainfall and Runoff: A Guide to Flood Estimation are revised, the new IFDs can only be used in specific circumstances.