with two dock -breakwater extensions each 91.4 m (300.0 ft) long. 

 Enclosing the southern side of the marina is a second FTB, 161.6 m 

 (530.0 ft) long. The width of these units is 3.7 m (12.0 ft). Primary 

 flotation is derived from polyurethane foam poured into the tire crowns. 

 Rubber conveyor belting fastened with bolts is used to couple the tires. 



Site: 



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25 50m 





BBBBMM | Pier/FTB 



Docks/FTB 



LAKE 

 CHARLEVOIX 



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Installation: The breakwaters are both tied to pilings and anchored by 9 kg 

 (20 lb) danforth anchors. Anchors and pilings are spaced from 3.0 m 

 (10.0 ft) to 3.7 m (12.0 ft) apart. Mooring lines are of wire rope and 

 vary from 3.0 m (10.0 ft) to 18.3 m (60.0 ft) in length. 



Special Equipment: Red and green navigational lights are placed on the 



structure at the entrance to the marina. White lights are also placed at 

 15.2-m (50.0 ft) intervals along the breakwater. A wood dock running the 

 full width of the structure is installed atop the first breakwater by 

 means of a massive steel frame. The docks have full electrical and water 

 service. 



Field Experience 



Operation: The only moderate problems which have been encountered are ice 

 damage and coupling failure to the rigid docks. Fouling growth is 

 considered a minor problem. Litter entrapment is frequent, but due to the 

 accessibility of the breakwater, this is considered a simple way by which 

 the marina can be kept clean. The only problem encountered in the day-to- 

 day operation of the structure has resulted from children who enjoy 

 playing on and around the FTB. If he could rebuild the breakwater, the 

 operator would suggest adding more flex joints at the corners of the docks 

 and using different dock-to-piling connections for quieter operation. 

 Under typical storm conditions with waves 1.1 m (3.5 ft) in height and 

 19.7 m (64.5 ft) in estimated length, the transmission coefficient is 

 0.57. No deterioration in performance has been noted since installation. 



Maintenance: Scheduled maintenance includes checking the moorings and 



couplings, removing entrapped debris, and occasionally redriving piles. 



65 



