Home > Projects > Aquatic Ecosystem Restoration – Elizabeth River
Aquatic Ecosystem Restoration – Elizabeth River
Union County, New Jersey
Professional Services Provided
- Water Resources Engineering
Description of Professional Services
A failure of the Elizabeth River bank threatened to expose a .5 MGD sanitary sewer main. Damage to the sewer main had caused two previous emergency repairs to prevent raw sewage discharge into the river. Erosion and instability of the river bank required immediate stream bank stabilization actions to eliminate the threat to the aquatic ecosystem.
The US Army Corps of Engineers contracted with DuBois & King to prepare an Appraisal Report which followed Section 14 of Emergency Stream bank Restoration guidelines. Phase One included: site investigations with COE personnel and meetings with local stakeholders, survey, river channel and flood plain cross sections, three dimensional modeling, hydraulic analysis using HEC-RAS, soil borings and laboratory testing of slope stability, preliminary design of stabilization techniques, identification and evaluation of five alternatives, construction cost estimates, cost-benefit analysis, and project mapping (using MicroStation & InRoads).
The DuBois & King appraisal report concluded that Federal interest was warranted and recommended and that the project continues with the Section 14 process for basis of design and preparation of plans and specifications. The COE New York District requested that DuBois & King continue as the prime to complete the final design.
Phase Two included: coordination with State and Federal agencies, field resource inventories (wetland delineation), preparation of an Environmental Assessment and Finding of No Significant Impact (FONSI), assistance in obtaining a joint NYSDEC and USACE permit for Water Quality certification and preparation of Basis of Design document.
Final design included: 1400 feet of stream bank stabilization with minimal impacts to environmental and cultural resources. The river velocities required riprap for slope stabilization, plantings enhanced natural re-vegetative process, a rock toe berm design over the key trench reduced impacts to aquatic ecosystem and is self-sustaining during future flood events and will minimize future maintenance and therefore disturbance to resources. Back to Top
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