The North Topsail Beach Shoreline Protection Project is about to enter its fifth phase with the restoration works scheduled for early December 2014. This project was awarded to Norfolk Dredging on July 9, 2014.
Construction works will start near 3588 Island Drive and go south toward the Surf City line. The design beach includes a 25 ft wide dune fronted by a 45 ft wide berm. The dune elevation is established at +14 ft NAVD and the berm elevation is +6 NAVD. Sufficient advance nourishment will also be placed to maintain the beach through the design life.
The average fill density to complete the project is approximately 75 cubic yards per linear foot for an estimated total fill volume of 1,500,000 CY. Material is proposed to be dredged from the offshore borrow area located approximately one-half to one and one-half miles offshore at the northern limits of Phase 5.
Future shoreline maintenance will be required to maintain the beach design on an approximate 5 year interval. Erosion trends calculated between 2005 and 2013 verify approximately 100,000 CY per year will be needed to sustain the 11.1 miles of shoreline in North Topsail Beach.
This volume is anticipated to be available through periodic maintenance of New River Inlet. Maintenance events are currently proposed on a 5 year interval and are expected to provide approximately 500,000 CY for each event. The first maintenance event is anticipated in FY17-18.