Another major rehabilitation of the breakwaters occurred in 1966. 

 Both heads and a 108-m (355-ft) portion of the east structure trunk shore- 

 ward of the head were affected. The heads were armored with two layers 

 of 31,750-kg (35-ton) tribars on the upper one third of the slope, while the 

 lower two thirds were protected by a double layer of 45,360-kg (50-ton) 

 tribars. Two layers of 31,750-kg (35-ton) tribars were placed from a new 

 concrete rib cap to the toe of the rehabilitated sea-side slope of the east 

 breakwater trunk. In 1969, a portion of the west breakwater trunk was re- 

 paired with 17,240-kg (19-ton) tribars and the construction of a concrete 

 rib cap. A shoreward 24.4-m (80-ft) extension of the concrete rib cap was 

 completed in 1973 along with the installation of additional 17,240-kg 

 (19-ton) tribars. The shoreward extent of these tribars was buttressed 

 with larger tribars weighing 31,750 kg (35 tons). 



In 1977, the following repairs were made to the structures: 27,215-kg 

 (30-ton) reinforced dolosse were placed in two layers over the 29,940-kg 

 (33-ton) tetrapods on the sea-side quadrant of the west breakwater; 

 18,145-kg (20-ton) reinforced dolosse were placed on the sea side of the 

 west breakwater trunk; 27,215-kg (30-ton) reinforced dolosse were placed 

 in a double layer over the 29,940-kg (33-ton) tetrapods on the sea-side 

 quadrant of the head of the east breakwater; 18,415-kg (20-ton) reinforced 

 dolosse were placed in a double layer on the sea-side slope of the trunk of 

 the east breakwater beginning shoreward of the 31,750-kg (35-ton) 

 tribars; and two layers of 5,445-kg (6-ton) unreinforced dolosse were 

 placed on the sea-side slope of the east breakwater trunk. 



The most recent repairs occurred in 1984 and consisted of the installa- 

 tion of 8,165-kg (9-ton) tribars on the harbor side of the east breakwater 

 over a 235-m (765-ft) distance. The concrete rib cap also was extended 

 shoreward by 130 m (430 ft). On the west breakwater, one layer of 

 5,900-kg (6.5-ton) tribars was placed on the harbor-side slope over a dis- 

 tance of 130 m (425 ft), and a single layer of 9,980-kg (11-ton) tribars 

 was placed on the sea-side slope over a distance of 50 m (160 ft). A con- 

 crete rib cap was also constructed over this distance, and the 9,980-kg 

 (11-ton) tribars were buttressed with 22,680-kg (25-ton) tribars. 



The breakwaters at Kahului Harbor were monitored from 1991 to 1993 

 through limited ground surveys, aerial photography, photogrammetric 

 analysis, and a broken armor unit survey as part of the "Periodic Inspec- 

 tions" work unit of the MCNP program (Markle and Boc 1994). Very ac- 

 curate armor unit positions on the breakwaters were obtained during this 

 study. 



The Kahului Harbor breakwaters were inspected on 21 July 1998. The 

 inspection, as close as could be observed visually, indicated that most of 

 the armor unit positions were similar to those obtained during the 1993 

 survey. Views of the structures are shown in Figures 6 and 7. On the east 

 breakwater it appeared that two 31,750-kg (35-ton) tribars had flipped and 

 slid downslope slightly on the sea side of the structure at approximately 

 sta 10+50. Additional breakage of some of the 5,445-kg (6-ton) dolosse 



1 Chapter 2 Project Descriptions and Inspection Results 



