Client

New York City Transit (NYC Transit)

Location

New York, NY

Market

Resilience

Rail Transportation: Line Segments & Tunnels

Services

Design: Mechanical Engineering, Civil Engineering, Structural Engineering

Environmental Sciences: Environmental Site Assessment & Investigation, Resilience & Sustainability

Planning/Pre-Design: Conditions Assessments/Surveys, Master Planning

Transit System Fan Plants and Adjacent Tunnel Flood Mitigation

When Superstorm Sandy struck in the fall of 2012, several critical fan plants and tunnel locations throughout the NYC Transit system sustained significant flood damage. To help protect these spaces against future weather events, STV prepared a feasibility study, master plan and hardening and repair drawings and specifications for fan plants, emergency exits, access ways, ventilation structures, and other water entry points such as ducts and manholes.

After a field inspection and site survey of each plant, STV considered all alternative solutions to prepare for future storm surges by examining the risks, response time, operations and maintenance requirements, and cost benefits associated with each approach. With a goal to protect against a Category 2 hurricane tidal surge, multiple mitigation methods and technologies were explored, including relocating vent structures and including water sealing devices, installing marine flood doors, water-tight lift off hatches, mechanical closure devices, and integrating additional components to withstand heightened electric static, water, and wave activity.