Therefore, 



d^ = 1.10 H^ = 1.10 (3.0) = 3.3 m (10.8 ft) 



From equation (7-95) 



h^ = 0.78 E^ = 0.78 (3.0) = 2.3 m (7.7 ft) 

 The dynamic force component from equation (7-96) is 



R^ = ^^ = 10.0^7 (3.3)(2.3) ^ 3g^^ ^^^^ ^2,610 lb/ft) 



and the moment from equation (7-97) is 



M = R (d + ^) = 38.1 fo.7 + ^ = 70.5 ^ (15.900 ^ ) 

 m m \ s 2 I \ 2 1 m rt 



where dg = 0.7 m is the depth at the toe of the wall when the SWL is at 

 MHHW. The hydrostatic force and moment are given by equations (7-99) and 

 (7-100): 



^ ^^6 '^ \^ _ 10.047 (0.7 + 2.3)^ ^^3^, 



R _S ^— = '"'"'*' ^^-1 " "--^^ = 45.2 kN/m (3,100 lb/ft) 



s 2 2 



M^ = R^ ^^ll^ = 45,212 9.dJLlA = 45.2 ^ (10,200 ^ ) 



The total force and moment are therefore, 



R^ = R^ + Rg = 38.1 + 45.2 = 83.3 kN/m (5,710 lb/ft) 



IfN— m ft— Ih 



M . = M + M = 70.5 + 45.2 = 115.7 ^^^^ (26,000^^^ ) 

 t m s m tt 



(b) When the SWL is at MLLW, the structure is landward of the still-water 

 line. The distance from the still-water line to the structure x^ is given 

 by the difference in elevation between the SWL and the structure toe divided 

 by the beach slope; hence 



\=^- 12 m (39.4 ft) 

 The limit of wave runup is approximately 



2"b _ 2 (3.0) _ , ,n n, 

 ^2 = ^T = 0.05 - ^^° " 



7-197 



