Use of the flow chart, design curves, and r values are demonstrated 

 in the following example design problems. 



V. EXAMPLE DESIGN PROBLEMS 



************** 



EXAMPLE PROBLEM i************** 



GIVEN : Embankment with quarrystone riprap; cot 0=2; cot g = 0; dg = 10 

 feet (3 meters); H^ = 2 feet (0.61 meter); T = 3 seconds; k^ = 0.7 foot 

 (0.21 meter). 



FIND ; Wave runup (use one of the flow charts in Figs. 2, 3, or 4). 



SOLUTION : Since the structure is defined as an embankment, use the flow 

 chart in Figure 2 as follows: 



(a) Type of armor unit is quarrystone. 



(b) Bottom slope is cot B = (i.e., horizontal), 

 dg ,f, 



Cc) iF= ^= 5 (i.e., > 3). 



(d) Structure slope is cot 6 = 2 (i.e., between 1.5 and 5) 



(e) Therefore, determine R/H' from Appendix B. 



d 



(f) For 77^ = 5, use Figure B-2, and 



o 



,_ "^ 2 _ _ .., 



\.&J 



K 0.7 '•" ~ "•"' "-"^ 





H' 



Oi) 



"^ - 2 n c\(\fi'> 



^- (32.2)(3)2-°-°°''- 



(i) 



Therefore, ^ - 1.18. 









(j) From Figure 2, scale effect is k = 1.00. 

 (k) Finally, from Figure 2, 



-(^)(Hi 



) (k) 



= (1.18) (2) (1.0) 

 R = 2.36 feet =2.4 feet (0.73 meter), 



IS 



