Table. Values of r for various slope characteristics 

 (from Battjes, 1974). 



Original source 



Slope characteristics 



Shankin 

 H.L. Delft 

 CERC 1 

 Franz ius 

 CERC 



Shankin 



Shankin 



H.L. Deift 



H.R.S. Wallingford 



Shankin 



CERC 



Starosolszky 



Smooth, impermeable 1.0 



Concrete blocks 0.90 



Basalt-covered stone blocks 0.85 to 0.90 



Gobi blocks 0.85 to 0.90 



Grass 0.85 to 0.90 



One layer of rubble 0.80 



(impermeable foundation) 



Set stone 0.75 to 0.80 



Round stones 0.60 to 0.65 



Rubble 0.50 to 0.60 



Rubble 0.50 to 0.55 



Broken rubble 0.50 to 0.55 



Two or more layers of rubble 0.50 



Tetrapods 0.50 



1 Added to Battjes (1974) original table (from McCartney 

 and Ahrens, 1975) . 



