Table 28 



Two Mile Breakwater 



Two Mile, Florida, SAM 



Date(s) Construction and Rehabilitation History 



1976 Two breakwaters retaining dredged materials were constructed on 



either side of the entrance channel to Two Mile Channel (Figures 43 

 and 45). The breakwaters were constructed parallel to, and 465 ft 

 seaward of, the Two Mile Channel centerline. Prior to construction, 

 elevations from -2 to +10 ft and -2 to +2 ft existed on the east and 

 west sides, respectively. These areas had been built up from the 

 material obtained from dredging of the existing channels. Both 

 L-shaped breakwaters had 810-ft-long sections facing the entrance 

 channel and 1,685- and 2,685-f t-long sections on the east and west 

 sides, respectively, parallel to Two Mile Channel. The design sec- 

 tion was to be built to +7 ft mlw with a 30-ft crown width and 

 1-V:10-H side slopes. Because of the nature of the dredged mate- 

 rial, construction dikes were built around the periphery to retain 

 the dredged material, allowing excess water drainage and material 

 consolidation. The construction dikes were built up from adjacent 

 bottom material to a cross-section elevation of +6 ft mlw, a crown 

 width of 5 ft, and side slopes of 1V:3H above +1.5 ft mlw and 1V:8H 

 below. After completion of the breakwaters, the construction dikes 

 were left in place, and the side slopes facing the entrance channel 

 were revetted with filter fabric and rubble stone. 



1982 The outer ends of the two breakwaters had been eroding and were 

 revetted with stone left over from the original construction. 



1985 The breakwaters are presently in good condition. 



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