Table 25 



Provincetown Harbor Breakwater 



Provincetown, Mass. 



Date(s) Construction and Rehabilitation History 



1970- A 2,500-ft-long rubble-mound breakwater was constructed, providing 

 1972 Provincetown Harbor protection from storm waves (Figure 28, plan 



view). The breakwater was placed shore parallel, except for a 350- 

 ft-long shoreward hook at its northern end, and located approximately 

 2,000 ft offshore in water depths of -11 to -20 ft mlw. The design 

 geometry consisted of a +15.5 ft mlw crown elevation, a 10-ft crown 

 width, and 1V:1.5H side slopes. The breakwater heads differed only 

 in having 12-ft crown widths (via 100-ft width transition sections). 

 The 0- to 50-lb bedding stone was placed in a 3- to 4-ft-thick layer 

 and extended 5 to 8 ft beyond the cross-section toe. The core stone 

 and slope stone below -8 ft mlw were 100 to 4,000 lb in size. A 

 double layer of 5- to 8-ton cover stone was placed above -8 ft mlw. 

 The contract cost for placing an estimated 328,000 tons of stone was 

 $3,534,000. The design was based on an 8-ft, 7.3-sec fetch-limited 

 wave height and a maximum tide level of +12.2 ft mlw. Stone size was 

 selected using Hudson's slope stability formula. 



1978 The breakwater was found to be in excellent condition during a visual 

 inspection. 



1984 Recent yearly visual inspections indicated that the breakwater was in 

 good condition. 



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