II. VALUES OF r FOR CONCRETE ARMOR UNITS 



1 . Embankment , 



a. Gobi Blocks. 



r «f 0.93 for H'/k or H/k % 6 

 or v 



(use H» when d /H' > 3 and H when d /H* < 3) 

 ° 8 0- so 



3-{fin (0.10m}- 



A 



(K/fi 



iievation of Gobi BlocK Plan View of Gobi BlocK 



b. Stepped Slopes 



Values of 



r for 



stepped 



slopes. 





Type of step 



Slope (cot 



6) 



r l 



Vertical risers 





1.5 



2.0 

 3.0 





0.75 

 0.75 

 0.70 



Rounded edges 





3.0 





0.86 



x l < H'/k < 12 where k is the height of 

 or- r ft 



the riser. 



23 



