Table 1 



Stumpy Point Bay Breakwaters 



Stumpy Point Bay, North Carolina, SAW 



Date(s) Construction and Rehabilitation History 



1967 Two earthen breakwaters were constructed (Figure 4) in the harbor by 

 the deposition of 74,200 cu yd of dredged fill reinforced at their 

 seaward ends by 6,130 tons of riprap and stabilized by the planting 

 of beach grass, all at a cost of $218,300. The north and south 

 breakwaters were 875 and 125 ft long, respectively. The breakwaters 

 provide protection for the harbor area and 10-ft-deep channel en- 

 trance. The design section (Figure 4, insert) consisted of a 15-ft 

 crest width at +8 ft mlw with side slopes of IVrlOH and 1V:20H, 

 above and below +1 ft mlw, respectively. The 50- to 1,000-lb riprap 

 stone on the seaward end of each breakwater was to be 3 ft thick and 

 extend from -1 to +3 ft mlw. Bedding material was placed to act as 

 a filter layer beneath the riprap. 



1969 Visual examination of the breakwaters by the State of 



North Carolina Department of Water and Air Resources indicated that 

 "both breakwaters seemed to be in good shape." 



1974 A reconnaissance survey was made to determine the severity of 



erosion to the breakwaters. It was found that the riprap protected 

 sections were functioning satisfactorily but that the fill material 

 adjacent to the riprap sections had substantially eroded. Maximum 

 vertical scarps of 7, 3, and 3 ft, respectively, were noted on the 

 bay and harbor sides of the north breakwater and bay side of the 

 south breakwater. The erosion on the north breakwater was on di- 

 rectly opposite sides of the breakwater with only 30 ft of original 

 material separating the narrowest point. It was felt that "the 

 southeasterly wind with its associated fetch is very erosive to the 

 breakwaters on both sides of the dredged channel." 



1985 Neither repairs nor maintenance has been carried out since the 

 breakwaters were originally constructed. 



10 



