dd38 - Page 5

ARR 2016 and 12d Model

ARR 2016 (Australian Rainfall and Runoff) has updated its hydrology for Climate Change, and 12d Model 12 C1k is ready for the change!

Rainfall intensities are changing as well as the rainfall patterns. ‘Storm bursts’ are now more common headlines in the news.

For ARR 2016, the new rainfall intensities and patterns are downloaded from the Australian Bureau of Meteorology (BOM) and the ARR Data Hub so you are always using the most up to date intensities.

Also for ARR 2016 there are now ten rainfall patterns for each storm duration instead of the one rainfall pattern used in ARR 1987.

The ten rainfall patterns reflect not only the importance of peak water levels but also have different timings.

The timing of the rainfall in the storm can be extremely important in evacuations planning - a slow-rising storm to a high water level may not have as great an impact on evacuation as a fast-rising storm with a lower water level.

Adjustments for ‘effective’ impervious areas are also suggested in ARR 2016.

We will be running ARR 2016 courses from early 2018 to bring interested users up-to-date with the new standard and how it is implemented in 12d Model 12.

Holiday Season Closure - Sydney

As yet another big year draws rapidly to a close, it’s time for our Sydney offices to take a short break! We’ll close from the afternoon of Friday 22nd December 2017, and re-open the morning of Tuesday 2nd January 2018. Jump on the User Forum in the break!