A thread for design and engineering.
Had a look into the background of flood gating tunnels. There seems to be a few examples.
1930’s London Tube Flood Gates
NYC Retrofitted flood gates
These were installed to key tunnels for both road and rail after Hurricane Sandy. Gates can be shut in 30 min.
These 25-ton gates will block car tunnels that connect Brooklyn and Manhattan. Other gates will block subway tunnels. Along with elevators leading to the subway. Fabric will be used to cover subway stairs. Each gate is custom made to fit the opening.
Miami Metal Floodgates from hurricane storm surge
Where tunnels are exposed to flooding, the tunnel is either made floodable or sealed using gates. This could be applied in Brisbane if required on busway or rail corridors.