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A pontoon boat is a flattish boat that relies on nautical floats for buoyancy. Common boat designs are a catamaran with two pontoons, or a trimaran with three. [2] In many parts of the world, pontoon boats are used as small vehicle ferries to cross rivers and lakes. [3] An anchored raft-like platform used for diving, often referred to as a pontoon
They are allowed to haul only their own traps, and must display their buoy colour or license number on their boat so law enforcement officials know what they should be hauling. The buoys are brightly coloured with highly visible numbers so they can be seen in poor visibility conditions like rain , fog and sea smoke .
The mooring is held up in the water column with various forms of buoyancy such as glass balls and syntactic foam floats. The attached instrumentation is wide-ranging but often includes CTDs (conductivity, temperature depth sensors), current meters (e.g. acoustic Doppler current profilers or deprecated rotor current meters), and biological sensors to measure various parameters.
The mast itself was topped with a Styrofoam float that helped insure that a capsizing, (especially in shallow water that could damage the mast), would be easily righted and result only in the boat going part way over. If capsized it was designed to rest on one hull, with the ball at the top of the mast preventing it from going fully inverted.
Water-logging commonly occurs over a long period in polystyrene foams that are constantly exposed to high humidity or are continuously immersed in water, such as in hot tub covers, in floating docks, as supplemental flotation under boat seats, and for below-grade exterior building insulation constantly exposed to groundwater. [60]
Floating docks, Gdynia, Poland. A floating dry dock is a type of pontoon for dry docking ships, possessing floodable buoyancy chambers and a U-shaped cross-section. The walls are used to give the dry dock stability when the floor or deck is below the surface of the water. When valves are opened, the chambers fill with water, causing the dry ...
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Of these, 617,901 (93.7 percent) were made of decomposible natural materials, while 44,034 were non-biodegradable Styrofoam floats. There were 163,679 fewer krathong collected than in 2015. The city mobilized 210 workers and 45 boats to collect floats from the Chao Phraya River and canals. [38]
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