Monday, 6 February 2023
Austroads has updated design related knowledge and guidance on hydrology and hydraulics in the Guide to Road Design to reflect the new work and methodology from Australian Rainfall and Runoff (ARR) released in 2019.
“Drainage designers rely on the advice provided in the guide and it is crucial we keep it up to date to make sure practitioners are provided with the most current guidance to design efficient and effective road drainage systems,” said Michael Nieuwesteeg, Austroads’ Road Safety & Design Program Manager.
The update focussed on parts 5, 5A and 5B of the Guide to Road Design, incorporating ARR’s latest flow estimation techniques and design inputs used in hydrology. A different approach to the terminology was applied for expressing flood probability and risk.
New topics were added, including very rare and extreme floods, blockage, acceptable impacts, joint probability, and uncertainty.
Download the guides:
Guide to Road Design Part 5: Drainage – General and Hydrology Considerations
Guide to Road Design Part 5A: Drainage – Road Surface, Networks, Basins and Subsurface
Guide to Road Design Part 5B: Drainage – Open Channels, Culverts and Floodway Crossings
The webinars with presenters Chris Russell, Mark Babister and Bill Weeks attracted great interest and a large number of participants with more than 900 practitioners attending the sessions.
View the recordings of the sessions below.
The first webinar provides an update on the changes to the guide, focusing on Section 6.
The second webinar covers the improvements made to the Regional Flood Frequency Estimation (RFFE) method.