New York State Department of Transportation Drainage and Storm Resiliency on Brooklyn-Queens Expressway between 58th Street and Grand Central Parkway

GPI is providing preliminary design services (Phases I to IV) for the New York State Department of Transportation (NYSDOT), focused on enhancing drainage capacity and improving long-term storm resiliency along this approximately 4-mile stretch.

Initially, the project scope included the evaluation of four specific flood-prone locations. However, after multiple severe storms between March and April 2024, which caused additional flooding at other locations along the corridor, the project scope was expanded to include the entire segment. GPI’s efforts have involved comprehensive analysis of existing drainage conditions at all sag curves along the BQE mainline within the project limits.

Using HydroCAD and OpenRoads software, GPI is developing and evaluating multiple alternatives for stormwater detention, infiltration, and drainage network modifications. Design exhibits are being prepared for each alternative to illustrate projected peak flow reductions for 10-, 50-, and 100-year storm events using underground detention and infiltration systems. Due to the limited available green space along the corridor, locating these systems has required close coordination with NYSDOT, CSX, NYCDEP, and other city agencies.

As part of the design phase, GPI is preparing a comprehensive Final Design Report. The report will document all alternatives under consideration, including associated costs, nonstandard or nonconforming features, environmental and constructability concerns, existing traffic conditions, and a recommended alternative to advance into final design.