Flood Risk Management Case Study

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The flood risk reduction project involves construction of about 7,070 feet of levees, 3,585 feet of floodwalls, 2,640 feet of dune, and beach renourishment at 10 year intervals along the Raritan Bay and Sandy Hook Bay in Port Monmouth Middletown Township, Monmouth County, New Jersey. The project provides protection to low lying residential and commercial structures, built upon and near the salt and fresh water marshes that are experiencing flooding caused by coastal storm inundation. This problem has progressively worsened in recent years due to loss of protective beaches and increased urbanization in the area. This has made structures susceptible to flooding from rainfall and coastal storm surges, erosion and attack, combined with…show more content…
This project has two phases: Phase 1 begins with Beach Replenishment. Approximately 400,000 cubic yards of sand is placed along the shoreline creating a 95-foot wide beach berm to absorb wave energy. This is to be renourished at 10-year intervals. Dunes are another important part of phase 1 of this project. A 25-foot-wide, 15-foot-high dune spanning nearly 3,300 feet. Plantings are put in to hold sand in place. Over time, this will increase dune height. To make up for this, pedestrian and vehicle ramps are placed to provide access to the shoreline. A Pier Extension is one more necessity for phase 1. They have lengthened an existing fishing pier approximately 200 feet, including an Americans with Disability Act compliant ramp for individuals with limited mobility. Identical decking and railing maintains a uniform look along the shoreline. Finally, a groin or jetty like structure concludes phase 1 of the project. The groin is needed to hold sand in place and reduce erosion. Phase two involves wetland mitigations and eradicating invasive plants that overtake vegetation that is vital to the wetlands. Pump stations will also be emplaced. This is important for interior drainage and channeling excess water back into Raritan Bay. During this phase the roads will raised aligning it with a system of levees. Floodwalls and Levees will be installed on main coastline road access. Two 13-foot floodwalls and a system of earthen and
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