The latest rainfall intensities and depths to be used in design and analysis procedures are obtained after completing the previous steps from the ARR Data Hub. If you want to obtain the 2016 IFDs separately to the ARR Data Hub click here.

This website displays intensity-frequency-duration data in various formats, and allows data to be transferred as comma separated variable (.csv) text files. Tables can cover different AEP ranges and rainfalls can be expressed as depths (mm) and intensities (mm/h).

When arriving to this site from the ARR Data Hub, users only need to click on the second leftmost button above the map to download a .csv file containing both Frequent (AEP) and Very Frequent (EY) rainfall depths. Save this file.

You are now ready to transfer this data to your DRAINS model. Click to proceed to Entry of IFD Rainfall Data and Ensembles into DRAINS or continue reading below for more information on the 2016 IFDs.

This shows design rainfall depths for various frequencies - annual exceedance probabilities of 63.2%, 50%, 20%, 10%, 5%, 2% and 1%.  The first of these is equivalent to 1 exceedance per year (1 EY).  The table can be expanded to include non-standard durations added at the top-left of the page.

Clicking on the 'Chart' tab above the table shows a graph:

If you click on the Units to the right of the window and change this to 'mm/h' the table (now coloured orange) and graph will be expressed as intensities rather than depths.  Although we work with intensities in DRAINS, the exchange of data from the BOM site will occur as depths.  Going back to the depths table, clicking on the first symbol above the map will open a download of a file in comma-separated variable (.csv) format.

If you also wish to include 0.5 and 0.2 EY (2 and 5 year average recurrence interval) intensities, you will need to download a second  .csv  file.  To do this, select Very frequent design rainfalls at the top left of the BOM site window and click the Update button. The depths table will now look like this:

Frequencies are set out as EYs, rather than AEPs.  This data can be downloaded  in another .csv file, which will be named  table.csv, which you can rename Toowoomba IFD depths table 2.csv and save to the same location as the first file.

Manually Obtaining 2016 I-F-D data & Other Information

2016 IFD data can be obtained from the Bureau of Meteorology website: If not, users will need to obtain coordinates from maps or spatial websites such as Google Maps and provide them in the search .

http://www.bom.gov.au/water/designRainfalls/revised-ifd/

After the Submit button is clicked, a page will appear as shown at the top of this page.