The hydrostatic force component will therefore be 



w (d^ + h l2 



and the overturning moment will be, 



(d + h ) w [d^ + h ]3 



The total force on the wall is the sum of the dynamic and hydrostatic 

 components; therefore, 



R^ = R„ + Rg (7-101) 



and 



M^ = M„ + Mg (7-102) 



b. Wall Shoreward of Still-water Line . For walls landward of the still- 

 water line as shown in Figure 7-105, the velocity v' of the water mass at 

 the structure at any location between the SWL and the point of maximum wave 

 runup may be approximated by, 



and the wave height h' above the ground surface by 



(7-104) 



where 



Xi = distance from the still-water line to the structure 



Xo = distance from the still-water line to the limit of wave uprush; i.e, 

 Xo = 2HiC0t g = 2Hr/m (note: the actual wave runup as found from the 

 method outlined in Section 11,1 could be substituted for the value 

 2Hi) 



(i = the angle of beach slope 



m = tan g 



An analysis similar to that for structures located seaward of the still-water 

 line gives for the dynamic pressure 



^2 wdi 

 p = :^v_ = ^ I 1 __L J (7-105) 



7-194 



