Key Takeaways:
- Underground infrastructure in major cities faces growing flood risks as flash flooding, storm surge and extreme weather events threaten transportation tunnels, utility corridors, mechanical rooms and other critical ventilation-dependent systems.
- Traditional ventilation openings create a key vulnerability during severe weather, allowing floodwater to rapidly enter underground facilities, resulting in equipment damage, service disruptions, costly repairs and public safety concerns.
- The AquaTrigger® Ground Vent (AGV-720) provides automatic flood protection for underground ventilation systems, remaining hidden during normal operation while automatically sealing vent openings when rising water is detected – without manual intervention.
- Combined with the AquaTrigger Vent Basin (AGV-710), cities and infrastructure operators can achieve both continuous airflow and passive flood mitigation, improving climate resilience, protecting critical assets, and maintaining reliable infrastructure operations during extreme weather events.
The Facts:
Large metropolitan areas depend on extensive underground infrastructure systems to support daily life. Transportation tunnels, utility corridors, mechanical rooms and pedestrian subways all require continuous ventilation to maintain safe air quality, temperature control and operational reliability. In densely populated urban environments, these ventilation systems are critical to keeping sub-surface infrastructure functioning safely for the public and for essential city operations.
The Challenge:
Unfortunately, ventilation openings that provide airflow to underground infrastructure also create a major vulnerability during severe weather. Flash flooding, storm surge and rapidly rising surface water can quickly overwhelm traditional vent openings, allowing water to enter underground systems within minutes. Once floodwater penetrates these spaces, the result can be catastrophic, leading to equipment damage, electrical failures, service interruptions, costly repairs and dangerous conditions for both workers and the public. As climate patterns continue to produce more intense rainfall events, cities are increasingly challenged to protect vulnerable underground infrastructure without compromising the ventilation systems required for normal operation.
The Solution:
PS Flood Barriers developed the AquaTrigger® Ground Vent (AGV-720) specifically to address this challenge.It is an automatic flood barrier engineered to remain concealed below the vent opening during normal conditions, preserving the architectural appearance and maintainingunrestricted airflow. During flooding conditions, the AquaTrigger Ground Vent automatically reacts to rising water and seals the opening, preventing floodwater from entering the ventilation system and the critical infrastructure below. This automatic operation provides passive protection without requiring manual deployment or operator intervention during emergency conditions.
In addition, the AquaTrigger Vent Basin (AGV-710) serves as a companion
solution to the AquaTrigger Ground Vent for applications where water management strategies direct stormwater away from the protected area. The AquaTrigger Vent Basin provides permanent ventilation protection while maintaining unrestricted airflow at all times. Engineered for applications where full closure is not required, it supports proper air exchange while complementing broader site drainage and flood mitigation strategies.
Together, the AquaTrigger Ground Vent and AquaTrigger Vent Basin allow cities, infrastructure operators and public transit authorities to provide critical ventilation and passive flood control at the same time. By protecting these underground systems from flash flooding and extreme weather, they are better able to serve their citizens and customers without overtaxing their resources.
Click here to learn more about the AquaTrigger Ground Vent and AquaTrigger Vent Basin, or fill out this form and a representative from PS Flood Barriers will contact you.