While working for WSP | Parsons Brinckerhoff, I worked on Saw Mill Brook Project in Helmetta, New Jersey. The
purpose of the project is to replace the existing culvert (5-C-103) under Main
Street that conveys Sawmill Brook No.2 in the Borough of Helmetta, Middlesex
County, New Jersey. The
existing Main Street (C.R.615) over Sawmill Brook No.2 is a concrete slab span
type structure with twin 3’ culverts and concrete parapet. The culvert is
supported by concrete abutments and doesn’t have block walls beyond culvert
concrete channel. The existing culvert has a natural bottom.
The
existing culvert will be replaced with a 6’ by 2.4’ three-sided culvert. The
proposed culvert will be buried to have a natural bottom to match the existing invert
of the channel. The proposed culvert will also be slightly longer than the
existing, so the proposed culvert will be extended approximately 10 foot to the
east and 5 foot to the west. The additional
culvert length is required to allow for staging of the roadway improvements so
that traffic can be maintained while construction takes place and for the
proper attachment of the guiderail to the proposed headwalls.
The hydraulic study report has been prepared in support of the Flood Hazard Area (FHA) Control Act Permit
application for the replacement of the culvert that conveys Sawmill Brook under
Main Street in the Borough of Helmetta and Township of Monroe, Middlesex
County. Refer to the USGS Project
Location Map for the project location. The FHA Permit application has been prepared
in accordance with the Flood Hazard Area Control Act Rules (N.J.A.C. 7:13). New Jersey Department of Environmental Protection (DEP) has approved this study on September 3, 2015.
