Sydney Metro has been designed to seamlessly integrate station concourse and entrances with potential future developments, improving customer and pedestrian access, and minimising disruption to the surrounding city, while delivering a functional and economically viable design solution.
Community Legacy and a Design for the Future
The aim is for Sydney Metro to leave a community legacy by creating a simple, flexible design that is sustainable in the long-term and will provide a benchmark for future local and international Metro projects.
Drainage and Flooding
Resilience in flooding and drainage refers to the ability of infrastructure to be immune to a major storm event and to ‘bounce back’ if any adverse impact occurs.
For Sydney Metro, flooding would pose a significant issue, as any water entering underground stations would damage station infrastructure. This would cause knock-on effects such as delays, disruption and potential security issues. In addition, there are socio economic impacts resulting from repair works and down time caused when trains are inoperable.
In designing for resilience, there are two major criteria the Sydney Metro drainage design is based on:
- Probable maximum flood (PMF), which is defined as the largest flood that could conceivably occur at a particular location
- A 100 year storm event plus 0.5m of additional height to account for freeboard and climate change (100 year + 0.5m).
Both criteria address the effect of climate change. For Sydney Metro, emergency access to the underground stations has been designed to be above the highest level across the two criteria, while all other entrances incorporate automatic flood barriers that activate when flooding occurs.
Level sensors installed in the drainage system activate the barriers, which eliminates the need for a person to operate them, and eliminates flooding risk during a major flood event where a rapid response time is required.
Open drainage has been designed based on available space. Where there is space, open channels and basins are integrated into the surrounding urban design and are situated at a shallow level with a flat side slope.
Where space is more limited, deeper channels with steep side slopes have been designed, complete with barrier fencing for safety. At an aesthetic level, drainage collection pits also house plants so they can blend in with the urban design of the surrounding areas.