Flood Protection for Underground Rooms, Tunnels & Transportation Systems

The innovative FloodBreak® flood control system is the ideal solution for underground rooms that have vertical vent shafts to the surface. The FloodBreak Vent Shaft System is a passive double barrier system that fits securely in the vent shaft beneath street level grating and remains open until deployed by street flooding.

How it works

  • The buoyancy of the lower gate will force it to rise, rotate on its three hinges, and close against the “lip” angle of the upper gate when water enters the vent shaft.
  • As the water rises further, the buoyancy of the upper gate will force it to rise, rotate on its three hinges, and close against the “lip” of the trough.
  • The water will continue to rise, until it reaches the level of the floodwater in the street.
  • As the water recedes, the system will automatically reopen.

Learn more about the FloodBreak Vent Shaft System