Table 8 



Little River Inlet Jetties 



Little River Inlet, South Carolina, SAC 



Date(s) Construction and Rehabilitation History 



1981- The construction of two armor stone jetties at Little River Inlet 

 1984 (Figure 14) was started in 1981 and completed in 1984 at a cost of 

 $5.5 million. The jetties provide improvement and stabilization of 

 the inlet, with the entrance channel maintained at -12 ft mlw. The 

 total lengths of the upcoast and downcoast jetties were 5,660 and 

 8,815 ft, respectively. Each jetty (Figure 15) consisted of a sand 

 dike, a sand-tight jetty section, a 650-ft weir section with "remov- 

 able" cover stone, a trunk section, and a 150-ft head section. The 

 cover stone along either weir section would be removed if, over a 

 period of several years, excessive deposition of sand occurred. 

 The jetty spacing at the parallel seaward ends was 1,000 ft. The 

 minimum crest elevation of the structure was 8 ft mlw (exclusive of 

 the weir section) . The head sections consisted of a double layer of 

 5- to 8-ton stone on IV: 2H side slopes. The trunk sections had 

 1V:2H side slopes with one layer of 3.5- to 6-ton stone. Design 

 procedures followed the SPM (1984), and the jetty configuration was 

 model tested at WES (Seabergh and Lane 1977) . The design wave 

 height was 11 ft, determined from depth-limiting criteria. 



1986 A visual examination of the structures indicated some displaced 



stone along the weir section of the north jetty. Surveys also re- 

 vealed scour holes at the head of the north jetty and along the 

 channel side of the south jetty. No apparent jetty damage was in- 

 dicated above the water surface. Damage along the toe of the struc- 

 tures, if any, is unknown. 



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