Crest Width 



Breokwoter Crest 



Max. Design SWL 



Rock Size 



Idealized Multilayer Section 



Layer 



W Primary Cover Layer' 



W/10 Toe Berm and First Underlayer' 



W/200 Second Underlayer 



W/4000 Core and Bedding Layer 



Rock Size 

 Gradation (%) 



125 to 75 

 130 to 70 

 150 to 50 

 170 to 30 



H = Wave Height 



W = Weight of Individual Armor Unit 

 r = Average Layer Thickness 



For concrete armor. 'Sections ID, 7, g, (1), (2) and (6) 

 2 Sections IH, 7, g, (5) and (8) 



Crest Widtti 



Breokwoter Crest 



Max Design SWL 



Recommended Three- layer Section 



Figure 7-117, 



Rubble-mound section for wave exposure on both sides with 

 moderate overtopping conditions. 



7-228 



