Middlesex County Utilities Authority
Underwater Inspection of Relief Outfall & Diffuser Structures
Boswell Engineering conducted an external inspection and a hydrographic suvey of the Middlesex County Utilities Authority's (MCUA) Supplemental Relief Outfall located in the north channel of the Raritan River. The structure was constructed in 1989 as a relief outfall that could be used during storm events with the main outfall located in the Raritan Bay. Included in the inspection were the north and south legs of the multi-port diffuser manifold, each with 25 risers. During the inspections it was determined a portion of the exposed risers were missing above the breakaway flanges, intact risers were missing duckbills and a diffuser riser was found partially buried in the mudline. A detailed report documenting the inspection findings was submitted with photos, AutoCADD drawings, table of deficiencies and repair recommendations.