protection for the facility. The FTB also serves as a means for boat 

 traffic control . 



Design Source: The builder utilized design literature from the New York Sea 

 Grant Program and the Goodyear Tire and Rubber Company. 



Construction: This FTB is 121.9 m (400.0 ft) in length and 5.9 m (19.5 ft) in 

 width. Primary flotation is derived from polyurethane foam poured into 

 the crowns of the tires. Rubber conveyor belting fastened with nylon 

 bolts is used to couple the tires. The only problem encountered in the 

 design stage was the public's reluctance to accept the project due to 

 their anticipation that the FTB would have an unsightly effect on the 

 waterfront. The operator noted that this bias vanished once the structure 

 was deployed. 



Site: 



ST. LAWRENCE RIVER 



<Kt&tM*/»//m*Mamjaam 



Installation: The breakwater is tied to pilings on both its exposed and 



sheltered sides and anchored also on its leeward side. The pilings are 

 spaced 18.3 m (60.0 ft) apart. The anchors are 136-kg (300 lb) concrete 

 blocks and are spaced 15.2 m (50.0 ft) apart. Mooring lines are of chain 

 and are 30.5 m (100.0 ft) in length. 



Special Equipment: A blinking green navigational light and a daymarker are 

 installed as per local Coast Guard requirements. White blinking lights 

 are placed on each outside piling, as well as fluorescent red traffic 

 cones between pilings. 



Field Experience 



Operation: Fouling growth and litter entrapment pose minor problems to the 



operation of this breakwater, otherwise the structure performs admirably. 

 Under typical storm conditions with waves 0.9 m (3.0 ft) in height and 

 6.4 m (21.0 ft) in estimated length, the transmission coefficient is 0.17. 



Maintenance: Scheduled maintenance includes checking the fastenings, removing 

 entrapped debris, and replacing batteries in the blinking lights. 



59 



