ARR Essentials will launch an 8-part series of intensive 3-hour Live Training sessions, run throughout 2021. Designed for engineers, consultants, modellers, policy makers and the broader water industry, this free 1.5hr session, will give an overview of the fundamentals of Australian Rainfall Runoff (ARR) and will discuss the philosophy and approaches used.

We will also investigate the major changes to ARR since the 1987 edition including the new approach for assessing climate change and lay the foundation for what participants will learn throughout the upcoming course series.


Mark Babister


Mark is a national leader in floodplain management and analysis. Mark has successfully completed numerous hydrologic, hydraulic, floodplain management, infrastructure and dam studies. Mark’s clear, ... Read more

Monique Retallick


Monique has 12 years’ experience in hydrology, 2d modelling and design of major waterway openings for road projects particularly on large and coastal rivers. Monique has extensive experience in the... Read more

Bill Weeks

Hydrology and water resources engineer

Dr Bill Weeks is a skilled hydrologist with over forty years’ experience in surface water and groundwater hydrology and hydraulics. He has worked on projects covering water resource assessments, flo... Read more


Australian Rainfall and Runoff (ARR) is the national guideline document, data and software suite for the estimation of design flood characteristics in Australia.

Originally published in 1958 by Engineers Australia, ARR 4th edition was released in 2019 with support of the Commonwealth Government of Australia and Geoscience Australia.

With national applicability, balancing the varied climates of Australia, it is a pivotal framework to the safety and sustainability of Australian infrastructure, communities and the environment. The information and the approaches presented in Australian Rainfall and Runoff are essential for policy decisions and projects involving:

  • infrastructure such as roads, rail, airports, bridges, dams, stormwater and sewer systems;
  • town planning;
  • mining;
  • developing flood management plans for urban and rural communities;
  • flood warnings and flood emergency management;
  • operation of regulated river systems; and
  • estimation of extreme flood levels.

ARR 4th edition is a major update to guidelines, the first in 30 years and consists of The Guidelines and associated Data hub and software.

ARR Live Training Series

Working in collaboration with two of the key authors of ARR 4th edition the Australian Water School has created the ARR Live Training Series to be run throughout 2021.

ARR Series will kick-off with a free webinar ARR Essentials, which will introduce attendees to the fundamentals of ARR (including the data hub and software), its core concepts, key topics and approaches.

ARR Essentials will lead into the Live Training Series comprised of 8 individual intensive 3-hour courses. Each course in the series will focus on a key topic of the guide.

Every course will be hosted by experts in their field, who will delve in-depth into the key topic, explaining best practice techniques and approaches.

Attendees will be introduced to, and work on, practical examples and case-studies, allowing them to apply the knowledge from the ARR Guidelines and learn, hands-on how to use the Data Hub and software.

How it works

AWS has designed the ARR Live Training to be delivered as a series with each course flowing into the next. This enables attendees to build their skills piece by piece through every course and understand all aspects of ARR.

Full Series | Register for the ENTIRE series and be rewarded with a 25% discount.

Attendees are also welcome to register for only individual courses based on the specific topic area which is of interest to them. Click on the links below to see more individual courses details and register now.

Date Title and Links
15th April Webinar: ARR Essentials
27th May ARR Live Course #1: Rainfall Design Inputs
24th June ARR Live Course #2: Flood Frequency Analysis
22nd July ARR Live Course #3: Hydrologic Modelling Applications
2nd September ARR Live Course #4: Flood Hydraulics
30th September ARR Live Course #5: Design Estimation
28th October ARR Live Course #6: Extreme Events
11th November ARR Live Course #7: Urban Approaches
9th December ARR Live Course #8: Urban Flood Modelling

Registrations Locations for ARR Essentials: