These results are depicted graphically in Figure 5. A direct comparison of 

 transmission coefficients between Plans 1A1 and 1A2 yields the following: 



T p . »«c 



Plan 1A1 C t 



Plan 1A2 C, 



Percent Increase 



7.0 



0.14 



0.19 



36 



9.0 



0.16 



0.22 



38 



11.6 



0.24 



0.28 



17 



This substantial increase in transmission is consistent with the increase in 

 stability. 



Rationale for Plan 1 A3 



Further review of available prototype information (photos, soundings, 

 records) confirmed that Plan 1A2 probably replicated prototype armor 

 placement; however, it was felt that the W/2 and W/3 stone was probably 

 more uniformly placed between -7 ft lwd and its top elevation of +3 ft lwd. 

 Thus, Plan 1A3 (Photo 16), incorporating this change in the W/2 and W/3 

 placement, was conceived. 



Transmission tests of Plan 1 A3 



Tests conducted with the same incident conditions used on previously 

 investigated plans yielded the following results: 



T_, sec 



H n n 



H r H 



C t 



7.0 



10.7 



1.6 



0.15 



9.0 



7.1 



1.3 



0.18 



11.6 



15.6 



3.8 



0.24 



These results, along with those obtained from previously investigated plans, 

 are presented in Figure 6. As shown therein, Plan 1A3 gives transmission 

 results that are in excellent agreement with the prototype. 



Stability tests of Plan 1A3 



Stability test results for Plan 1A3 were as follows: 



10 



Chapter 3 Tests and Results 



