Site: 



LAKE CUMBERLAND 



H=H 





Special Equipment: Plastic jugs painted orange are situated atop the 

 breakwater to warn boaters of its presence. 



Field Experience 



Operation: Litter entrapment is considered a minor problem; otherwise, no 



other operational problems have been seen. Under typical storm conditions 

 with waves 0.6 m (2.0 ft) in height and 11.9 m (39.0 ft) in estimated 

 length, the transmission coefficient is 0.50. 



Maintenance: Due to the structure's newness, no routine maintenance has as yet 

 been scheduled. 



Cost: The material components for the structure cost $1,300, mostly due to the 

 stainless steel parts. The builder felt that this was a high cost, but 

 necessary to avoid coupling failure. Labor was $800 and installation was 

 $300. These figures translate to an overall cost of $10.57/m 2 

 ($0.98/ft 2 ). 



Benefits: The estimated annual savings in maintenance to the facility is 



$1,000. The operator rated the breakwater as having a positive effect on 

 preventing shoreline erosion and a strongly beneficial effect on boaters' 

 comfort. He felt the structure had a negative effect on waterfront 

 appearance. The operator also rated the breakwater as providing excellent 

 performance in suppressing waves, meeting design goals, and satisfying his 

 needs. Overall performance was rated excellent. 



Project Analysis: While new with relatively little time for major problems to 

 develop, this FTB appears to be a success. While it is not built 

 according to the state-of-the-art, because of the modest site conditions, 

 the structure will probably fare well. The most extreme hazard the FTB 

 will face is likely to be limited structural failure due to the wire 

 cables cutting through the tires. This could have been prevented, 

 possibly with some money saved, by using rubber conveyor belting. The 

 simple use of orange plastic jugs as warning beacons is probably as 

 effective a means for preventing collisions as is warranted. One should 

 also note that this project has a deepwater site. An FB was really the 

 only option open to the operator. 



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