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The quality controlled rainfall data was analysed using statistically rigorous tools and techniques, such as: the Generalised Extreme Value distribution, which has been fitted using the technique of L-moments for the rainfall frequency analysis; Bayesian Generalised Least Squares Regression for deriving sub-daily rainfall statistics from daily rainfall values; GIS-based methods for gridding data; and an 'index rainfall procedure' for regionalisation of point data. * EY = exceedences per year# AEP = annual exceedence probability As is to be expected, the differences between the data and methods adopted have resulted in differences between the new IFDs and the ARR87 IFDs.
These differences vary not only across Australia but across durations and probabilities.
Requests should be sent to [email protected] IFDs are Intensity–Frequency–Duration design rainfall intensities (mm/h) or design rainfall depths (mm) corresponding to selected standard probabilities, based on the statistical analysis of historical rainfall.
IFDs are used in the design of infrastructure including gutters, roofs, culverts, stormwater drains, flood mitigation levees, retarding basins and dams.
However, for major projects, it may be necessary to store IFD values as part of the documentation to support decisions.
If you need to do this, you should clearly label the IFDs with the date they were extracted from the IFD website.
For hydrological and hydraulic calculations for small catchments, the catchment centroid can be used.
If you require design rainfall values in intensity, that is millimetres per hour (mm/h), there is an option to change the units to the upper right-hand side of the table or chart.
Due to the uncertainty in both the IFDs and the estimated Time of Concentration, times containing fractions of minutes are not permitted.
The main terms used to describe design rainfalls are: The table below lists the probability terminology used for the 2016 design rainfalls and shows in bold the standard EY and AEP values for which design rainfalls are available.
Generally, EY terminology is used for Very Frequent design rainfalls, AEP (%) terminology is used for Frequent and Infrequent design rainfalls, and AEP (1 in x) terminology is used for Rare design rainfalls.