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Title: Martin County, Florida, Hurricane and Storm Damage Reduction Project : Final Limited Reevaluation Report and Final Supplemental Environmental Impact Statement
Authors: United States. Army. Corps of Engineers. Jacksonville District.
Keywords: Environmental protection
Shore protection
Flood control
Martin County (Fla.)
Publisher: United States. Army. Corps of Engineers. Jacksonville District.
Abstract: The Martin County Beach Erosion Control Project was authorized by the Water Resource Development Act (WRDA) of 1990 (Public Law 101-640) in accordance with the Chief of Engineers Report dated 20 November 1989. This report authorized 942,000 cubic yards (cy) of beach fill to be placed on 4 miles of shorefront southward from the St. Lucie County line to near the limit of Stuart Public Park (Florida Department of Environmental Protection, FDEP, monuments R1 – R25). Periodic nourishment was calculated to be 424,000 cy every 8 years based on 53,000 cy/yr of erosion. A range of nonstructural and structural measures were evaluated to reduce beach, land, and property losses resulting from erosion, storms, and hurricanes along Hutchinson Island. The recommended plan of beach nourishment using an offshore sand source was carried forward as the preferred alternative as it maximized net NED benefits, meets the federal objectives of storm damage reduction, and considers the recreational and environmental needs of the study area. According to the 1994 General Design Memorandum (GDM), the updated initial construction fill was 1,083,100 cy with periodic nourishment authorized at an interval of 11 years, with an estimated loss of 589,600 cy every 11 years. This was based on a predicted 53,600 cy/yr erosion rate. Initial construction of the 4 mile project was completed in 1996. In the summer of 2000, nearshore artificial reef was created to mitigate for impacts to nearshore hardbottom in the project area. Following the initial construction, Martin County and the U.S. Army Corps of Engineers (USACE) constructed nourishments in 2001, 2002 and 2005. Due to the 2004 hurricane impacts, the project was fully restored in spring of 2005 utilizing sand from the previously approved borrow area (Gilbert Shoal). Approximately 269,500 cy of material were used to restore the project to pre-storm conditions at 100% federal cost using Flood Control and Coastal Emergencies (FCCE) funds, and approximately 625,500 cy were used to restore to full design conditions using construction general (CG) funds. Table 1 and Figure 1 provide the details and locations of all past nourishments of the Martin County Project. The next periodic nourishment is scheduled for 2012. As part of Planning Engineering, and Design (PED), the volume of beach quality material needed was not found to be available in the previous borrow area. A new borrow area has been identified. In addition, an opportunity was identified through discussion with United States Fish and Wildlife Service (USFWS) to modify the construction template to alleviate concerns over lost sea turtle nests immediately following construction. This report documents 1) any differences in scope from the authorized project, including borrow areas 2) an updated benefit to cost ratio and nourishment interval 3) National Environmental Protection Act (NEPA) documentation status 4) a section 902 limit analysis and 5) cost-sharing for construction. Attachments to this document include an economic appendix, cost estimate, and sea level rise appendix.
Description: Limited Reevaluation Report/Supplemental Environmental Impact Statement
Rights: Approved for Public Release; Distribution is Unlimited
Size: 451 pages/117.3 Mb
Appears in Collections:Environmental Documents