Figure 53. Terminology involved in performance characteristics 



of low-crested breakwaters 90 



Figure 54. Basic graph for wave transmission versus relative 



crest height (van der Meer 1991) 93 



Figure 55. Distribution of wave energy in the vicinity of 



a reef breakwater (Ahrens 1987) 95 



Figure 56. Cross section of reef breakwater at Redington 

 Shores at Pinnelas County, Florida (Ahrens and 

 Cox 1990) 96 



Figure 57. Cross section of reef breakwater at Elk Neck 



State Park, Maryland (Ahrens and Cox 1990) 96 



Figure 58. Armor stone characteristics of Dutch wide 

 gradation, Dutch narrow gradation, and 

 Ahrens (1975) SPM gradation 99 



Figure 59. Benefits and cost versus design level 



(from EM 1110-2-2904) 105 



Figure 60. Breakwater 22 under construction at Presque Isle, 



Pennsylvania 107 



Figure 61. Land-based construction at Eastern Neck, 



Chesapeake Bay, Maryland 108 



Figure 62. Spacing of profile lines in the lee of a 



detached breakwater (from EM 1110-2-1617) Ill 



Figure Al. Location map A2 



Figure A2. Existing shoreline condition A3 



Figure A3. Typical breakwater section A8 



Figure A4. Breakwater construction procedure A14 



Figure A5. Pre-construction shoreline A15 



Figure A6. Post-construction shoreline A15 



Figure A7. Completed project at south end A16 



Figure A8. Completed project at north end A16 



