How to use the IFD system
The new Intensity-Frequency-Duration (IFD) design rainfalls are found using location based searches:
- Acknowledge and accept the conditions of use and the coordinates caveat. You must agree with these conditions in order to proceed.
- Enter your location information in the Search panel. To choose a type of location coordinate, select 'Decimal degrees', 'Degrees, Minutes, Seconds' or 'Easting, Northing, Zone'.
- Decimal degrees: Fill in your latitude and longitude. Whilst the system will accept both positive and negative degree values, it will assume a southern latitude and an eastern longitude as the coordinates are only valid over Australia.
- Degrees, Minutes, Seconds: Fill in your latitude and longitude as degrees, minutes and seconds. Take note of the degrees sign information above.
- Easting, Northing, Zone: Fill in your easting, northing, and zone.
- If desired, enter text into the label field which will be printed on the generated IFD, to help you identify your results.
- Select 'Submit' or 'Map Preview'. 'Map Preview' will show the submitted location on a map.
- The IFD for this area has now been generated. You can view it as a table, or a chart (graph of data).
- Download as CSV: Allows the user to download the table as a CSV text file.
- Download as PNG: Allows the user to download the chart as a PNG image file.
- Print Screen: Opens a print dialogue on a separate screen. (Note that you also have the choice of saving the table or graph first and then printing those files directly.)
Enter any information desired into the label field which may help you identify your selected location. This label will be displayed on the exported chart image heading.
Entered durations may be rounded. The rounded value will be displayed in the IFD Design Rainfall Depth (mm) table. The rounded value shown in the results table is the value used in calculations, and therefore may differ slightly from the entered value.