(possibly due to overtopping waves, Figure 8). No voids and breaches 

 were noted in the breakwaters, and the overall condition of both structures 

 was considered good. 



' ''"■ V •*-; /*•'*" *w 



Figure 8. Tribars that appear to have tilted downslope (Kahului west 

 breakwater) 



Laupahoehoe Boat-Launching Facility 

 Breakwater, Hawaii 



Laupahoehoe is located on the north coast of the island of Hawaii ap- 

 proximately 40 km (25 miles) north-northwest of Hilo. In 1988, a 76-m- 

 long (250-ft-long) rubble-mound breakwater was constructed that 

 protected a 2.9-m-deep (9.5-ft-deep) mllw entrance channel, a 2.3-m-deep 

 (7.5-ft-deep) mllw turning basin, and a boat-launching ramp. The layout 

 for the facility is shown in Figure 9. The breakwater is armored with two 

 layers of 27,215-kg (30-ton) reinforced dolosse, and the crest is stabilized 

 with a concrete rib cap. 



The breakwater was monitored from 1991 to 1993 as part of the "Peri- 

 odic Inspections" work unit of the MCNP program (Markle and Boc 

 1994). Monitoring included limited ground surveys, aerial photography, 

 and photogrammetric analysis. Very accurate armor unit positions were ob- 

 tained during the study. 



The Laupahoehoe breakwater (Figure 10) was inspected 22 July 1998. 

 The inspection indicated that the armor units were in the same positions 



12 



Chapter 2 Project Descriptions and Inspection Results 



