USACE Green Brook Flood Control Project

Princeton Hydro has been tasked with providing professional design services and regulatory support to the USACE’s New York District for Segments C3 & C4 of the Green Brook Flood Risk Management Project in Middlesex, New Jersey. The scope of work included engineering services for the design of flood risk management measures in the Green Brook sub-basin of the Raritan River. These measures consist of a combination of earthen levees, reinforced concrete structural floodwalls, and a structural roadway closure gate. Due to significant development within the watershed, these urban and suburban areas are highly susceptible to flooding. Unfortunately, the floodplain and adjacent developed areas have been routinely impacted during significant storm events (i.e., the 100-year event and greater).

Associated design and ancillary features consisted of the utilization of a deep foundation system to support structural floodwall components (i.e., micropiles); seepage control via the utilization of sheet pile cut-off walls; stormwater management and conveyance of interior drainage; utility coordination/relocation; scour protection along the base of the line of flood protection; design of a designated system overtopping location; coordination to assist USACE with ROW acquisition; and providing operation and maintenance access along the line of protection.

A combination of hydrology, hydraulic, geotechnical, structural, and civil site design/analyses and inter-discipline coordination were required to facilitate the design of the flood risk management project. Associated traffic control, right-of-way, and environmental plans were also developed.  In addition to the design and plan preparation, technical specifications, and quantity takeoffs were performed, as per the scope of work.  Princeton Hydro also developed comprehensive regulatory submissions for the project, including, but not limited to Freshwater Wetlands (FWW) and Flood Hazard Area (FHA) submissions to NJDEP and application for an Erosion and Sediment Control Certificate with the local soil conservation district.