H (in this study H^) = highest wave height at the structure that 



causes no damage; i.e., wave height at which 

 damage < 2 percent 



W a = weight of an individual armor unit in the 

 primary cover layer 



S a = specific gravity of armor unit, relative to the 

 water at the structure 



8 = angle of the structure slope measure from 

 horizontal in degrees 



13 



