for the equivalent irregular w,ave conditional except for structures with 

 high relative freeboards. For relative freeboards roughly in tKe range 

 0.85 < (h. - dg)/Rg < l.Q, the irregular wave overtopping rate can exceed 

 the monochromatic rate. In addition, there will be a small amount of 

 irregular wave overtopping for Qx - d ]/Rg >_ 1 . which would not be pre- 

 dicted using the SPM monochromatic method. The analysis also shows that 

 the peak irregular wave overtopping rate (defined as Qq^) will exceed 

 the monochromatic rate for all values of the relative freeboard. 



Because of the uncertainty in determining the wave height, runup, 

 and parameters a and Q^ required to predict the overtopping rate, the 

 design engineer may be justified, in some situations, in using the mono- 

 chromatic wave overtopping technique, which is generally conservative. 

 The proposed technique should yield a more accurate estimate of the 

 overtopping rate for wind -generated waves; however, it is not necessarily 

 conservative. 



17 



