Neither of the installations at Sitka or Tenakee Springs has experienced 

 any icing of consequence. The Puget Sound sites are ice-free. 



Water quality problems that could arise in a small-craft harbor enclosed 

 by an impermeable barrier are avoided by the floating breakwaters. In many 

 cases, the floating breakwater and anchor lines enhance or provide additional 

 habitat. 



Some designs for the concrete caisson breakwater have proposed a hollow 

 structure, thus eliminating the cost of the usual Styrofoam core, and then 

 relying on the integrity of the concrete shell and inspections to avoid loss 

 of buoyancy through leakage. The foam core provides a good form for casting 

 and also allows the box to be formed by a continuous pour. However, care must 

 be exercised to assure that the foam does not compress during the pouring 

 operations, thereby altering the design freeboard levels. It is suggested that 

 fabricators be allowed the option of which method is the most economical, or 

 that close cost comparisons be made before a design is fixed. The foam core 

 is good insurance against flooding. 



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