Hudson (1958) 



SLOPES 



A Stone 



B Stone 



1 on 1.25 



Ion 1.25 



1 on 1.5 

 1 on 20 

 1 on 2.5 



Ion 1.5 



1 on 3.0 

 1 on 4.0 

 1 on 5.0 



1 on 2.0 



0.75 



d s = 0.61m (2ft) 



H <d e — h. 



Jackson (1968 a) 

 (quarry stone) 



Armor Layer 



(w 2 stones thick; 

 random placerru 



■»I.IO 



-J-W0.7 



2d underlayer 



d s = 0.61 m 

 (2 ft) 



Savage (1958) 



Tank 

 Wall 



Permeable Structure 



^7^7^77^77^777 



d s = 0.38m (1.25 ft) 



Figure 24. Permeable rubble-mound structures. 



62 



