T p , sec 



H mo . ft Measured 



c, 



Incident 



Behind Reef 



Behind Breakwater 



7.0 



2.2 



1.9 



0.5 



0.23 



7.0 



4.0 



3.3 



0.7 



0.18 



7.0 



7.0 



5.2 



1.0 



0.14 



7.0 



9.8 



7.2 



1.3 



0.13 



7.0 



12.0 



8.4 



1.6 



0.13 



9.0 



3.0 



2.7 



0.7 



0.23 



9.0 



4.9 



4.3 



1.0 



0.20 



9.0 



6.9 



5.8 



1.3 



0.19 



9.0 



8.3 



6.8 



1.5 



0.18 



9.0 



9.5 



7.7 



1.7 



0.18 



9.0 



10.6 



8.5 



1.8 



0.17 



11.6 



1.9 



1.9 



0.7 



0.37 



11.6 



4.1 



3.7 



1.2 



0.29 



11.6 



6.5 



5.7 



1.7 



0.26 



11.6 



9.0 



7.6 



2.1 



0.23 



11.6 



11.3 



9.3 



2.5 



0.22 



11.6 



13.9 



11.1 



2.9 



0.21 



11.6 



17.6 



13.1 



3.9 



0.22 



11.6 



19.7 



14.1 



4.7 



0.24 



11.6 



21.4 



15.0 



5.5 



0.26 



The transmission response of Plan 4 is very similar to Plans 2, 2A, and 3 for 

 the 7- and 9-sec periods. The only noticeable improvement occurs for the 

 larger 11.6-sec waves. Photos 27-29 show that both the reef and the existing 

 breakwater were stable. 



Plan 4A (Figure 8) used the same volume of material as Plan 4; however, 

 the crown elevation was raised to the water surface (+4-ft lwd) and the crown 

 width was narrowed to 30 ft. Transmission results were as follows: 



17 



