Table 26
Arecibo Harbor Breakwater
SAJ
Arecibo, Puerto
Date( s )
Construction and Rehabilitation History
1944
A 1,200-ft armor stone breakwater was completed, providing protec-
tion for the harbor and its 25-ft-deep access channel (Figure 4 )
25-lb to 10-ton core stone protected with one layer of armor stone,
10-ton minimum weight. A recent (1983) visual examination indicated
that most of the armor units were 1 to 18 tons). The side slopes
0
on the ocean side and
on the harbor side. The
were
crest width and elevation were 20 ft and +15 ft mlw, respectively.
The breakwater was constructed along a reef with a depth varying
from -20 ft mlw at its seaward end to mlw at its landward end.
Repair work consisted of resetting armor stone and placing about
1952
8,300 tons of new granite stone at an estimated cost
The structure was rebuilt to its original design geometry and stone
sizes, except for the outer 50 ft which was not repaired. Damage
dislodgement of stone and
resulted from wave action which
settlement of portions of the breakwater. A subsequent Chief of
armor stone along the slope of
Engineers report indicated that
the structure showed signs of
1983
A field inspection and a condition survey were made to identify dam-
aged areas for rehabilitation purposes. The general damage (Fig-
or greater. In partic-
part of the structure had increased to
ular, about 160 ft of the seaward end had subsided to approximately
mlw. Several areas on the trunk section had unprotected core stone
on either side of the structure.
1984
Rehabilitation of the breakwater consisted of rebuilding the outer
end of the breakwater and restoring damaged sections by placing
about 42,000 tons of armor stone, ranging in size from 11 to 29 tons
seaward side of the structure along a reach beginning about 350 ft
from the shore end of the breakwater and extended toward the outer
end, a distance of 450 ft. A double layer of armor stone was placed
on both sides of the structure for the next 265 ft. The remaining
155 ft, at the seaward end of the structure, was rebuilt to +15 ft
mlw, as were the other sections. The crest of the damaged sections
was restored to a width of about 26 ft for the first 800-ft reach.
The crest of the outer 420-ft section was widened to about 36 ft,
flaring out to about 50 ft at the extreme outer end. Armor stone
and
slopes for the ocean and harbor sides were
respectively, Based on utilizing local stone, the cost of the work
was estimated to be ,900,000. The design analysis used was the
(Continued)
75
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