Table 5 



Atlantic Harbor of Refuge Breakwater 



Atlantic, North Carolina, SAW 



Date(s) Construction and Rehabilitation History 



1971- A 2,000-ft-long sand breakwater (Figure 8) with a riprap head was 



1972 constructed in February 1972 as part of the Harbor of Refuge proj- 

 ect. Material dredged from the access channel was used for the 

 breakwater. A tentative design section called for a crest width of 

 15 ft at an elevation of +8 ft mlw, with side slopes of 1V:10H above 

 mlw and 1V:20H below. The head of the breakwater would have a 

 3-ft-thick riprap section from -1 to +3 ft mlw. This design sec- 

 tion was similar to the one used on the Stumpy Point Bay break- 

 waters. Estimated quantities were 46,500 cu yd of sand, 3,232 tons 

 of stone, and 6.5 acres of grass (to hold the sand in place). The 

 estimated total cost was $51,400. 



1973 Erosion had occurred along a 400-ft section of the southeastern face 

 of the breakwater. The erosion extended from 35 to 60 ft into the 

 embankment, creating an escarpment of about 3 ft, and the planted 

 grass had been destroyed in this area. Also, the stone protection 

 on the south end of the breakwater (previously covered with sand) 

 had become uncovered, displaced, and scattered. The sand fill be- 

 hind the stone apparently eroded away first, undermining the rock 

 and subsequently displacing it. 



1985 No maintenance work has been carried out since construction. 



16 



