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Title: Delaware Bay Coastline, Delaware and New Jersey, Roosevelt Inlet - Lewes Beach, Coastal Storm Risk Management Project, Sussex County, DE : Environmental Assessment (EA)
Authors: United States. Army. Corps of Engineers. Philadelphia District
Keywords: Beach nourishment
Environmental protection
Environmental management
Publisher: United States. Army. Corps of Engineers. Philadelphia District.
Abstract: As presented in USACE (1997), the purpose of this project is to provide (as a CSRM project) hurricane and storm damage reduction for 50 years, for the community of Lewes, Sussex County, Delaware, based on this bayfront community’s vulnerability to storm damages. Problems identified in the project area include 1) long term shoreline erosion as a result of natural forces; 2) storm damage vulnerability with potential for storm-induced erosion, inundation and wave attack exacerbated by long term erosion; and 3) shoreline erosion as a result of Federal navigation projects in the vicinity. USACE (1997) evaluated a number of structural and non-structural alternatives that resulted in the authorized beachfill and terminal groin plan described in Section 1.0. The plan as evaluated in USACE (1997) only considered dredging as a means for obtaining sand (i.e. Roosevelt Inlet and Borrow Area A sources), which was due to economic efficiencies associated with dredging large quantities of sand required for initial construction (174,000 cy) and periodic nourishment (132,000 cy). However, a recent need has been identified to obtain sand utilizing the “truck haul” method, which is the transport of sand (obtained from a local commercial quarry), and subsequent delivery to the beach by dump trucks. This method is more economical (compared to dredging) when sand fill quantities are substantially less, and there is considerable cost savings when the mobilization/demobilization of a dredge is not required. The truck haul method was not evaluated in USACE (1997) because it was not contemplated given the higher sand quantities estimated for initial construction and periodic nourishment. The need to provide beachfill sand delivered by the truck haul method was identified in the 2016 PIR (USACE, 2016) following the January 2016 Nor’easter which resulted in damages to the project. It is currently estimated that approximately 30,000 cy of sand is needed to restore the project to full construction template following the January 2016 Nor’easter. The truck haul method may also be more appropriate in potential future FCCE actions and/or periodic nourishment where sand quantity requirements are significantly less than those described in USACE (1997).
Description: Environmental Assessment
Rights: Approved for Public Release; Distribution is Unlimited
Appears in Collections:Environmental Documents

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