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Melbourne Metro Flood Modelling

As climate change impacts rainfall patterns in Melbourne, it¡¯s expected that annual rainfall is likely to decrease. However, studies show that sudden storms and intense rainfall events will increase. Rising sea levels will also change how low-lying areas experience storm related flooding.

Since 2018, we have been involved in the flood assessment and design associated with the Melbourne Metro Project. This has involved developing detailed hydrologic and hydraulic models for several precincts including Arden, CBD North, CBD South, and Domain, as well as both tunnel entrances.

Our work included flood modelling for each precinct under both existing (pre-developed) conditions and proposed (post-developed) conditions. We incorporated modelling of the local catchment (stormwater flows), as well as major waterway flows from Moonee Ponds Creek, Yarra River, and Maribyrnong River.

We undertook this modelling alongside the civil design to support the building of all station and tunnel entrances above the required flood level and limit adverse impacts to surrounding private property. We consulted closely with Melbourne Water and the local council to achieve compliance and approval.

By understanding the latest data and learning from previous flood events, communities can better prepare their response to extreme weather.