significant amounts of sediment causing formation of either a salient or a 

 tombolo. An interesting multipurpose single detached breakwater project was 

 constructed at Channel Islands, California. This structure overlaps the har- 

 bor entrance, simultaneously shielding boats from direct wave energy and 

 trapping material adjacent to the entrance. 

 Venice, California 



16. This rubble-mound breakwater (Figure 6) was constructed in 1905 to 

 protect an amusement pier. It is 180 m long, has a crest elevation of +3.1 m 



Figure 6. Detached breakwater at Venice. 

 California (circa 1970) 



15 



