Table 11 



Breakwater and East and West Jetties 



Auasi Small-Boat Harbor, Tutuila Island, American Samoa 



Date(s) 

 1981 



Construction and Rehabilitation History 



A 125-ft armor stone breakwater and 100- and 450-ft east and west 

 armor stone jetties, respectively, comprised a portion of the 

 project completed in 1981 (Figure 24). Total cost of the project 

 was approximately $1,166,300. The structures were designed for 

 depth-limited breaking wave heights of 4.8, 7.0, 5.6, and 6.0 ft 

 for the breakwater, west jetty head, west jetty trunk, and entire 

 east jetty, respectively. Water depths for these wave heights 

 were 6.2, 7.2, 7.2, and 7.7 ft, respectively. The structures have 

 no history of damage or repair. There is some evidence of armor 

 stone breakage. Although quarried basalt armor stone appeared to 

 be free of cracks when placed, internal stresses may be respon- 

 sible for breakage. Testing by dropping from a 10-ft height onto 

 a stone bed did not result in breakage during construction. The 

 condition is not widespread and is not considered serious at 

 present. 



Figure 24. Auasi Small-Boat Harbor, Tutuila Island, American Samoa 



42 



