4 Conclusions 



Based on assumptions, tests, and results reported herein, it is concluded 

 that: 



a. The 4- to 6-ton armor stone used in Plans 1, 2, 3, and 3R is stable for 

 the maximum wave heights that can be expected to occur for 8- and 

 10-sec waves at swl's of +4.0- to +14.0 ft mlt with assumed scour 

 depths of -3.6 and -8.6 ft mlt. The 200- to 1,000-lb toe and crest stone 

 is only minimally adequate; therefore, it is recommended that the 

 weight of this stone be increased to the 200- to 2,000-lb range. 



b. The 6.2-ton concrete blocks used in Plans 4 and 4R are only marginally 

 acceptable for the maximum wave heights that can be expected to occur 

 for 8- and 10-sec waves at swl's of +4.0- to +14.0-ft mlt with an 

 assumed scour depth of -8.6 ft mlt. The 200- to 2,000-lb toe and crest 

 stone showed significantly improved stability relative to the 200- to 

 1,000-lb stone used in Plans 1, 2, 3, and 3R. 



c. The 6.2-ton concrete blocks used in Plans 5 and 5R are acceptable for 

 the maximum wave heights that can be expected to occur for 8- and 

 10-sec waves at swl's of +4.0 to +14.0 ft mlt with an assumed scour 

 depth of -3.6 ft mlt. Again, the 200- to 2,000-lb toe and crest stone 

 showed significantly improved stability relative to the 200- to 1,000-lb 

 stone used in Plans 1, 2, 3, and 3R. 



d. The modified concrete blocks used in Plans 6 and 6R are stable for the 

 maximum wave heights that can be expected to occur for 8- and 10-sec 

 waves at swl's of +4.0- to +14.0-ft mlt with an assumed scour depth of 

 -8.6 ft mlt. As would be expected, the 200- to 2,000-lb toe and crest 

 stone proved to be stable with the modified concrete blocks. It is rea- 

 sonable to assume that the modified concrete blocks would prove stable 

 for any lesser erosion depth. 



e. The 6-ton concrete blocks used in Plans 7, 7R, 8, 8R, 9, and 9R are 

 stable for the maximum wave heights that can be expected to occur for 

 8- and 10-sec waves at swl's of +4.0 to +14.0 ft mlt with an assumed 



Chapter 4 Conclusions 



21 



