Table 4. Values of r for application 

 at d s /H^ < 3 (from Stoa, 1979) 



Slope (cot 6) 



H/k r l 



r 



1.5 



3 to 4 



0.60 



2.5 



3 to 4 



0.63 



3.5 



3 to 4 



0.60 



5.0 



3 



0.60 



5.0 



4 



0.68 



5.0 



5 



0.72 



^H was used to derive these values from 

 experiments with d s /H^ > 3; for application 

 at d s /H^ < 3, use H, where H is the wave 

 height at the proposed structure location. 



Filter loyer 

 ^ ^^-Armor layer; 1.5 to 3 stones thick 



Embankment 



Figure 5. Sketch of quarrystone (riprap) embankment (from Stoa, 1979) 



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Structure Slope [Cot 9) 

 Figure 6. Relative runup for smooth slopes on a 1 on 10 bottom; 

 1/1 > 0.5; d s /H^ = 1.5 (from Stoa, 1978). 



21 



