Rubble-mound seawalls (Fig. 6-4) are built to withstand severe wave 

 action. Although scour of the fronting beach may occur, the quarrystone 

 comprising the seawall can readjust and settle without causing structural 

 failure. Figure 6-5 shows an alternative to the rubble-mound seawall shown in 

 Figure 6-4; the phase placement of A and B stone utilizes the bank material to 

 reduce the stone required in the structure. 



Fernandina Beach, Florida (Jan. 1982) 



Oceon 



Cap stone 92 to 683-kg 



If the existing beach surfoce is 

 higher than El 1.5m' MLW excovation 

 shall be required to place the ocean 

 side toe at El 1.5m MLW 



-^ 



15 0.3m 



Beach 



Elevotion vanes occordinq 

 to beach surfoce ,| 

 0.6-m 



I 5 



I 



Core material 92-kg to chips 

 min. 25%>20-kg 



Note Where walls exist modify section 

 by omitting rocK on londside 



Figure 6-4. Rubble-mound seawall. 



6-5 



