where 



(H \ = deepwater significant wave height 



R D = runup of probability of exceedance p 



p = 0.005 x i, i = 1, 2, 3,..., 199 



runup of monochron 

 height and period 



R = runup of monochromatic wave with the significant wave 



13. These equations can be considered to "correct" Weggel's mono- 

 chromatic results for the effect of irregular waves (Ahrens 1977a). Figure 3 

 shows Ahrens' "correction factors" for freeboards, F , less than the runup of 

 the significant wave, R s . When the freeboard is greater than R , Weggel's 

 equations yield no overtopping. However, larger runups in the runup distri- 

 bution may still overtop the structure, and Equations 3 and 4 must be used. 

 For these relatively high freeboards, the runup distribution should be 



1.0 



0.9 

 0.8 

 0.7 



O 0.5 — 





1 1 



1 1 1 



I I 1/ 



Mil 











/ p - 











//Is 











1 lip' 











1 //^- 











/ Up 



- 





g-0-14 



J}/ V 1 / 1 



" / <b/<sy / 



1 lfp~ 









/JM/ 





_ 



0.03 — * 







— 



- 



1 1 



I I 



1 1 1 



i 



0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 



Figure 3. Ahrens' correction factors (from Ahrens 1977a) 



