APPENDIX C 



VALUES OF r FOR CONCRETE ARMOR UNITS 



1. Embankment . (Additional concrete units for use on both embankments 

 and rubble-mound structures are given in Table C-2.) 



a. Gobi Blocks . 



r « 0.93 for H'/k or H/k « 6 



O T V 



fuse H' when d /H' > 3 and H when d /H' < 3) 

 ^ o so- so 



0.1 ( 



>m(3-{i 



•in )- 





A' 





fM 



rf^ 



1 















kf 















1 



Elevation of Gobi BlocK 



Plan View of Gobi Block 



Figure C-1. Gobi block (McCartney and Ahrens, 1975) 



b. Stepped Slopes . 



Table C-1. Values of r for stepped slopes. 



Type of step 



Slope (cot e) 



Vertical risers 



1.5 



0.75 





2.0 



0.75 





3.0 



0.70 



Rounded edges 



3.0 



0.86 



U < H'/k < 12 where k is the height of 

 or- r " 



the riser. 



24 



