Freshwater allowance, the difference between a ship's Plimsoll line in freshwater and saltwater, impacts the loading plan in varied salinity waters because the density of the water affects how much the ship sinks for a given weight. In freshwater, which is less dense than saltwater, a ship will sink deeper for the same amount of cargo loaded. The freshwater allowance indicates how much a ship can sink in freshwater compared to saltwater before reaching its load line, which....
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