Since H^ = 5 ft., from Figure 7-13 the runup correction factor k is 

 approximately 1.17. Therefore, 



— = 1.17 (2.9) = 3.4 , 



and 



R = 3.4 H;; = (3.4) (5) = 17.0 ft. 



The values of a and Q^ for use in Equation 7-6 can be found by 



interpolation between Figures 7-24 and 7-25. From Figure 7-25 for 

 a 1 on 3 slope for small-scale data. 



a = 0.09 



at — = 2.0 and — r =^ 0.0024 



H 



gT^ 



Q^ = 0.033J 

 Also from Figure 7-25 for larger scale data, 



a = 0.0651 



d^ Ho 



at -— = 2.33 and — ; = 0.0028 



Q^ = 0.040 



Note that these values were selected for a point close to the actual 

 values for the problem, since no large-scale data are available 

 exactly at 



= 2.0, 



and 



gT^ 



= 0.0024 



From Figure 7-24 for small-scale data on a 1 on 1.5 slope, 

 a = 0.067 



Qo* 



0.0135 



d^ Ho 



at — = 1.5 and — r = 0.0016 



H' 



gT^ 



Large-scale data are not available for a 1 on 1.5 slope. Since larger 

 values of a and Q5 give larger estimates of overtopping, interpola- 



lation by eye between the data for a 1 on 3 slope and a 1 on 1.5 slope 

 gives approximately, 



a = 0.08 , 

 Q^ = 0.035. 



7-50 



