0.8 



0.7 



0.6 



0.5 



0.4 



0.3 



I 2 3 4 5 6 8 10 2.0 



kr 



Figure 35. Values of r for slope and relative roughness 

 (H^/kp) for riprap slopes; armor layer approxi- 

 mately two stones thick (after Hudson and 

 Jackson, 1962) . 











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