Route 70 Dakota Trail to Riverview Drive

This was a limited scope resurfacing project designed to minimize impacts to streamline the environmental review process. During concept development, several locations were identified as having flooding/icing issues. Measures to correct drainage issues were minimized to avoid additional permitting, especially within the environmentally sensitive NJ Pinelands area. The design proposed to reset inlet grates and add additional inlets to reduce localized ponding. The cleaning of the existing inlets and pipes within the identified ponding or icing locations was recommended to NJDOT Maintenance since these activities are covered under general maintenance permits and would not require additional permitting from the State.  The cleaning also included submerged/buried outfalls within the ROW in order to address the drainage issues and provide free outfalls. The buried outfall pipes were cleaned by hand to avoid environmental impacts.

Three locations with flooding/icing issues were identified in areas with no environmental constraints. Proposed improvements to these areas were implemented as part of the resurfacing project, as no additional permits would be required that would delay the project schedule. Improvements included additional inlets, new pipes, cleaning existing pipes, and 2-foot grass swales in infield areas.

The project was a limited scope resurfacing designed to minimize impacts to streamline the environmental review process. During concept development, several locations were identified as having flooding/icing issues. Measures to correct drainage issues were minimized to avoid additional permitting, especially within the environmentally sensitive NJ Pinelands area. The design proposed to reset inlet grates and add additional inlets to reduce localized ponding. The cleaning of the existing inlets and pipes within the identified ponding or icing locations was recommended to NJDOT Maintenance since these activities are covered under general maintenance permits and would not require additional permitting from the State.  The cleaning also included submerged/buried outfalls within the ROW in order to address the drainage issues and provide free outfalls. The buried outfall pipes were cleaned by hand to avoid environmental impacts.

Three locations with flooding/icing issues were identified in areas with no environmental constraints. Proposed improvements to these areas were implemented as part of the resurfacing project, as no additional permits would be required that would delay the project schedule. Improvements included additional inlets, new pipes, cleaning existing pipes, and 2-foot grass swales in infield areas.

Arora performed and reviewed gutter flow analysis, preliminary detention basin sizing and pipe collection system analysis to determine undersized pipes and pressure flow causing existing pipe system to overtop. Due to environmental impacts and permitting deadlines, the pipe collection system was recommended to be cleaned including the outfalls to avoid impacting wetlands. The project hydrology was developed using TR-55 methodology (equivalent to HEC-MMS & TR-20) with the NRCS 24-hour rainfall curves were used to estimate the runoff rates. The tributary drainage areas to the bridge were developed using TR-55 with the most remote time of concentration (Tc) flow path. PondPack and InRoads Storm and Sanitary (equivalent to HydroCAD) were used for the routing of the flows within basins and closed drainage systems.