approximate limiting value for the zero-moment wave height is given by 



H \ /27rd 

 ™°» = 0.10 tan h {- ^1 (Bl) 



p /max \ p 



By substituting this (H ) value into Equation 1 (mam text) , a corre- 

 ■^ ° mo 



max 



spending relative freeboard parameter F' can be determined. This value of 



F' then can be substituted into Equation 3 (main text), and a Q value can 



be calculated or read from the appropriate data curve (Figures Bl , B2 , B3, 



and B4) . This Q value is representative of an average overtopping rate 



associated with a maximum H for a specific local still-water level (swl) 



mo 



at the structure toe d . The d value used in these calculations should 

 s s 



include an estimate of the setup which could occur at the project site. The 

 Q values determined in this manner can then be intercompared, and percent 

 differences and/or percent decreases in the overtopping rates can be computed. 



3. Overtopping rates calculated using data sets A, B, and D are listed 

 in Table B2. Phase I and Phase II seawall comparisons expressed in percent 

 decrease in Q for the hurricane event at the three swl's tested are given in 

 Table 2 of the main text. 



4. Overtopping rates calculated using data sets B and C are listed in 

 Table B3. The percent difference and percent decrease in Q given in 

 Table B4 and Table 3 (main text) were determined using the calculated Q 

 values for the hurricane conditions in Table B3. 



B4 



