Route 35 Bridge Over Heards Brook

Arora, as a prime consultant, is providing drainage and stormwater management support services, which include preparing a HEC-RAS analysis to size the Rt. 35 Bridge crossing over Heards Brook. The existing narrower bridge (12-ft) was proposed to be widened (36-ft) to ease upstream flooding. A downstream impact analysis was performed using PondPack to determine stage storage and final flood elevations downstream of the bridge. It was determined that the increased opening resulted in unacceptable velocity changes and changes in the water surface elevations upstream of the channel. The study has been extended upstream along the Heards Brook to the crossing under Route 9. The project deals with streambank erosion concerns along the rear yards of private residents along the Heards Brook. An open channel flow analysis using HEC-RAS was performed to confirm existing size required to control upstream velocities and avoid downstream impacts to maintain channel stability and avoid streambank erosion along these private residences. Arora was tasked to provide drainage and stormwater management support services. Drainage design including gutter flow analysis was performed to size and space roadway inlets to comply with NJDOT design criteria. Field reconnaissance was performed to examine the sinuosity of the banks, limits of erosion and top of banks, tributary drainage areas and downstream discharge limits to determine potential inundation areas.