This video is a short presentation of a vessel, on how to get the Fresh Water Allowance (FWA) and her draft finding the new draft due to change in density when displacement is constant. When a ship operates in water of 1025 kg/m3 (salt water) to water density of 1000 kg.m3 (fresh water) or vice versa, the change in draft is referred to as Fresh Water Allowance. It is found by the formula: FWA (in mm) = Displacement/4 x TPC. FWA is applied as an increase in draft when calculating the draft from SW to FW, and as a decrease in draft when calculating the draft from FW to SW. A fresh water allowance can be calculated for a ship at any draft at which she is floating. It is normally of interest when the ship is at, or close to, her summer load line that is desired to determine how much deeper than the summer draft in salt water may immersed when operating in fresh water.

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