Transmission results are plotted for constant wave period and swl in 

 Figures 34 and 35. These data show that the 0-ft swl produced consistently 

 lower transmitted heights with the 1-ft transmission criteron being reached for 

 7-sec, 10-ft and 9-sec, 9-ft incident waves. The 4-4-ft swl required 7-sec, 

 9-ft; 9-sec, 7-ft incident waves to produce 1-ft transmitted waves. The 3-ft 

 transmission criterion is exceeded by 16-ft (0-ft swl) and 14-ft (+4-ft swl), 

 11.6-sec waves. 



The stability response of Plan 10 was acceptable. As shown in Photos 60- 

 62, some of the 5-ton berm stone moved under wave attack with resultant 

 reshaping of the berm at its lakeward edge. The existing structure was 

 reasonably stable, with two harbor-side blocks being displaced downslope. 



Plan 10A (Figure 36 and Photo 63) was similar to Plan 10, except the 

 berm was reduced in width from 100 to 50 ft and the impervious plastic sheet 

 was replaced with 1,000-lb filter stone. Testing at the -f-4-ft swl produced the 

 following results: 



T B , sec 



Incident H„„, ft 

 mo' 



Transmitted //_,„, ft 

 ma' 



c t 



7.0 



2.3 



0.3 



0.13 



7.0 



4.2 



0.4 



0.10 



7.0 



6.9 



0.7 



0.10 



7.0 



9.9 



1.1 



0.11 



7.0 



11.7 



1.4 



0.12 



9.0 



2.9 



0.4 



0.14 



9.0 



5.0 



0.7 



0.14 



9.0 



6.6 



0.9 



0.14 



9.0 



7.7 



1.1 



0.14 



9.0 



9.2 



1.3 



0.14 



9.0 



10.7 



1.4 



0.13 



11.6 



1.9 



0.4 



0.21 



11.6 



4.2 



0.9 



0.21 



1-1.6 



6.7 



1.3 



0.19 



11.6 



9.0 



1.8 



0.20 



11.6 



11.5 



2.3 



0.20 



11.6 



13.9 



2.9 



0.21 



11.6 



18.0 



4.2 



0.23 



11.6 



19.9 



4.9 



0.25 



11.6 



21.7 



5.7 



0.26 



Chapter 3 Tests and Results 



29 



