5. Entering Figure 7-18, the ratio of runup to deepwater wave height is 

 found to be 1.53 or runup of 9.3 ft. To adjust for scale effects, 9.3 is 

 multiplied by 1.21, based on the SPM, for a total runup of 11.3 ft. 



6. To include wind effects on overtopping. Equation 7-12 of the SPM is 

 used as follows: 



h - d 



k' = 1.0 + Wf — r; — ^ + 0.1 sin 



where 



k' = wind correction factor 



Wf = coefficient depending on wind speed 



h = height of the structure crest above the bottom 



d = depth at the toe of the structure 

 s 



R = runup on the structure that would occur if the structure were high 



enough to prevent overtopping 



= structure slope (90 being vertical) 



7. For this example, a wind speed of 50 mph is used; therefore, based 

 on the SPM, Wf equals 1.5. The value of h - d /R equals 0.68 or 



k' = 1.0 + 1.5(0.68 + 0.1) sin 6 



= 1.0 + 1.17 sin e 



for e = 90, sin 6 = 1.0 



k' = 2.17 



8. A value of k' = 2.17 represents a 117 percent increase in over- 

 topping due to the contribution of wind because total overtopping equals 



Q (wave-induced) x k' . The following table summarizes the wave-induced and 

 wind-induced maximum overtopping rates based on the Phase II model tests with 

 eroded berm elevations of +1.0 ft and +3.4 ft above NGVD. 



C2 



