Figure 26. First rock -mound breakwater constructed in the 



United States— the Delaware breakwater (Quinn, 1972). 



^ 



ICE P1ERS__.. Vx. \ 





<o 



\ ■••■ 





.'*^ 



'^•...- 



Yi,/ j^-i|m 



■• BREAKWATER 

 ■\ 1901 



\' 



... H / ^hjTf tionAP 

 "C ^ i/ HARBOR '' 



% 





"\J:\ \ OF 



V; (Refuge 



\ 



D e.-'l o w a r e .^'""-i.^ Boy 



\^ .-., .:>'rHE''GAP::;-i8.97 



ICE BREAKER ''^ss^^^ 

 1869 



Figure 27. Construction stages (U.S. Army Engineer District, 

 Philadelphia— in press, 1974). 



53 



