H, 



From the dashed curve in Figure 8-13 and graph on page 8-20, for 

 and T as a function of U find the following: 



The computed wave heights plot as a straight line on log-normal 

 probability paper (see Fig. 8-14). 



Economic considerations as well as the purpose of a given structure 

 will determine the design wave conditions. The increased protection afforded 

 by designing for a higher wave would have to be weighed against the increase 

 in structure cost. 



For the illustrative purposes of this problem, the significant wave 

 height with a recurrence interval of 100 years will be used. Therefore, for 

 design, 



H^ = 1.09 m (3.59 ft) 



Tg = 7.78 s 

 for waves generated in Delaware Bay. 



t 5 



5 3 



S 



y 2 



--■ IIII I II I III t"' t l H I NH I I II l ll l , ' -t|| :::i-- — i^:ji lg ^ — Itl jM 



99.5 99 98 95 90 80 70 60 50 40 30 20 10 5 2 1 0.5 0.2 0.05 0.01 



FREQUENCY OF OCCURRENCE. PERCENT 



Figure 8-14. Frequency of occurrence of significant wave heights for waves 

 generated in Delaware Bay. 



8-25 



