Embankment and Rubble Mound. 



Table C-2. Values of r for concrete armor units 



Armor unit and 



Length dimension. 



Armor -layer 



Values 



Slopes 



placement method 



k 



r 



thickness 

 (No. of units) 



of r 



(cot e) 



Tetrapod 

 Random 



xn 



2 



0.45 



1.3 to 3.0 



Uniform 



CQ± 



2 



0.51 



1.3 to 3.0 



Quadripod 

 Random 







\ 



2 



0.51 



1.3 to 3.0 



t / \ 



Uniform 



\nro 



2 



0.51 



1.3 to 3.0 



Tribar 











Random 





TPT 



\ 



2 



0.45 



1.3 to 3.0 



Uniform 





JiL 



r 



1 



0.50 



1.3 to 3.0 







Modified cube 











Random 



y — k A 



2 



0.48 



1.3 to 3.0 



Uniform 





^ n 





1 



0.62 



1.5 



Uniform 

 Uniform 







Kr 



1 

 1 



0.73 

 0.55 



2.0 

 3.0 







25 



