The networks we rely on face growing risk from natural disasters
The infrastructure of Victoria, Australia, is under threat from an increasing number of natural disasters, with an estimated $57 billion worth of assets at risk. This includes roads, rail, energy infrastructure, and health assets, with the greatest costs expected to be incurred by Melbourne's road and rail networks. The report, published by Infrastructure Victoria, highlights the vulnerability of these networks to bushfires, floods, and extreme heat, with potential damage costs reaching $71 billion in the coming decades.
The report, titled "Warning Signs," is the first of its kind in Australia and provides a detailed analysis of how extreme weather events will impact infrastructure across Victoria in 2030, as well as a "worst-case" scenario in 2070. It emphasizes the need for proactive measures to mitigate the financial fallout from these hazards.
Natural disasters are not a new phenomenon, but their increasing frequency and severity challenge the environment and conditions these structures were built to withstand. The report identifies roads, rail, energy infrastructure, and health assets as the most vulnerable sectors, with bushfires, floods, and extreme heat posing the highest potential costs.
Melbourne and its surrounding areas are expected to bear the brunt of the damage costs, with major corridors such as the Hume and Princes highways also at risk. The report highlights the vulnerability of road infrastructure to flooding, as seen in the January flash floods along the Great Ocean Road, where heavy rains swept cars out to sea.
Rail infrastructure is also at risk, with up to $10 billion worth of assets, including tracks, stations, signals, and depots, vulnerable to damage from extreme heat. This can lead to delays for commuters and rail freight transport.
Energy infrastructure, particularly power lines and stations, is at risk of damage from bushfires, with $7 billion worth of assets in danger in 2030. These facilities are concentrated in the La Trobe Valley, Portland, and the northwest near Mildura.
The climate risk is evolving, with Victoria's annual average temperature rising by 1.2 degrees Celsius since 1910. The state has become drier, with the intensity of short-duration extreme rainfall events projected to increase. Fire weather and fire activity are also expected to increase in many regions of southeast Australia.
Health assets, including hospitals, are estimated to be at risk of $5.3 billion in damage in 2030. A recent example of the inadequate response to a disaster is the fast-moving grassfire in Natimuk, which prevented the timely evacuation of an aged care center.
The report models risk based on climate factors in 2030 and 2070 emissions scenarios, with Dr. Spear emphasizing that extreme weather events are already occurring and will become more frequent. He argues that now is the time to take action to ensure infrastructure is ready for the more extreme weather conditions expected in the future.
The cost of inaction is significant, with the Australian government spending an average of $1.6 billion annually on disaster recovery from 2012-2024. However, the report highlights the potential for cost-effective actions and funding measures to safeguard infrastructure, with even simple measures like cleaning stormwater drains offering a return of $5 in reduced damage for every dollar spent.
Dr. Spear concludes that acknowledging the growing risks and factoring them into infrastructure planning is essential for the country's future. He emphasizes the need to start taking action now to ensure that infrastructure continues to function in the face of more extreme weather conditions, a challenge that will persist over the coming decades as the climate continues to warm.
