Flooding is a natural and inevitable part of our weather cycle. While it will always happen in cities like Melbourne, we aim to minimise the risk to people, property and infrastructure. Find out why floods happen, our roles and responsibilities, and who we work with to manage flood risks.
Why floods happen
Flooding can be caused by:
- rivers and creeks bursting their banks (riverine flooding)
- ocean tides above normal sea levels (coastal tidal and storm surge flooding)
- sea level rise resulting from climate change
- rainwater exceeding the capacity of drainage systems (overland flows or flash flooding).
Our region has an extensive network of drainage infrastructure. Drainage systems built for earlier development were not designed to hold the increased volumes of water we now have flow through our landscape.
Urbanisation means rainwater flows faster off hard surfaces instead of filtering into soils. This increases flooding along waterways and on low-lying land. Urbanisation and climate change will continue to increase flood risk as the intensity of rainfall events increases, severe storms become more common, and the sea level rises.
Our roles and responsibilities
Coordinating flood management
As the region's floodplain manager, our role is to coordinate the development and delivery of the Port Phillip and Westernport Flood Management Strategy and drainage services in conjunction with local and state government agencies, emergency services, the insurance and private sector and the community.
Maintaining the regional drainage network
Together with local councils we both play a vital role in managing most of Melbourne’s drainage network. We maintain the regional drainage network, such as large drains and stormwater infrastructure that connect with rivers, creeks and bays.
We deliver drainage and other infrastructure projects such as retarding basins to minimise the impact of flooding by safely carrying stormwater away from built-up areas into rivers and creeks.
Monitoring flood data and undertaking modelling and mapping
We monitor waterway levels and provide flood prediction data to the Bureau of Meteorology to help them issue flood warnings.
We also undertake catchment and coastal flood modelling and mapping to help reduce the likelihood and consequences of floods.
Providing flood information and advice
We work with land developers to ensure new land developments don’t increase flooding risks or damage the environment. This includes reviewing planning permits to ensure all flood risks are included in the planning process.
Assessing severity of flooding
There are many challenges with replacing or improving older drainage systems due to increased urban development. In many suburbs there is no space left to store storm water. Large scale works to expand the capacity of our drainage system are often costly and extremely disruptive to communities.
We therefore prioritise flood risks classified as extreme, based on their social, safety and economic consequences, and build infrastructure to reduce their severity and impact.
Boosting community preparedness
Alongside our partners, we help to raise awareness of flood risk and help communities prepare for floods.
Informing the design of new suburbs
We make sure new suburbs are better designed, with:
- underground drainage that can handle frequent storms
- planned overland flow paths like roads, channels and open spaces, which carry excess floodwater away from houses.
Managing flood risks together
Preparing for and managing floods is a shared responsibility. Together we have responsibilities for protecting people, infrastructure, assets, economic activity and the environment.
We work in close partnership with state and local government, business and the community to minimise the damage floods can cause to people, places and communities wherever possible.
Victoria State Emergency Service (VICSES)
The Victoria State Emergency Service (VICSES) is the designated control agency for floods in Victoria. It is responsible for:
- leading emergency preparation and response
- provides emergency assistance when flooding occurs
- delivering community awareness and education programs.
Bureau of Metereology
The Bureau of Meteorology (BOM) is responsible for issuing flood warnings.
Emergency Management Victoria
Provides flood warning and alerts to the community via the emergency.vic.gov.au website and app.
Local councils manage the local drainage network, including street gutters and drains.
They are also responsible for:
- Administering and enforcing planning schemes
- Undertaking flood modelling and mapping of local drainage systems
- Supporting local flood planning and coordinating local emergency planning
- Supporting development of local community resilience
Check your local council website for further information.
Residents and community
Community members and businesses are responsible for understanding personal and local risks and being prepared for floods. Their responsibilities include:
- Maintaining a good drainage system on their property including gutters
- Understanding their local flood risk
- Being prepared with an emergency plan to reduce risks where possible
- Monitoring flood warnings and advice.