Step 2. Slope: Use a 1 on 3 revetment slope to be compatible 

 with the bluff slope. 



Step 3. Roughness Coefficient : Roughness coefficient is the 

 ratio of rough slope runup to smooth slope runup. 

 This coefficient is listed in the Appendix as the 

 factor which reduces smooth slope runup. 



Step 4. Wave Runup on Revetment (Table 2) : 



Find wave runup for a smooth 1 on 3 slope. 



Depth of water at maximum SWL is 6 feet + 4 = 10 feet. 



Find wave breaking depth. 



Assume: 



H = H b = 5 feet, 



H b 5 



-£. = £_ = 0.102. 



T 2 7 2 



From the SPM, Figure 7-2: 



d b 



TT = °' 95 ' 



d b = 5 X 0.95 = 4.75 feet. 



Since water level at structure is between 4 and 10 feet ; 

 wave will break on structure. 



From runup for maximum water depth (10 feet). 

 From the SPM, Figure 7-5: 





% = T756 = 3 ' 2 £eet; 



15 



