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Fresh-Water & Dock-Water Allowance

Fresh-Water Allowance (FWA) and Dock-Water Allowance (DWA) per Load Line Convention - the standard loaded-draft correction when crossing densities.

Load LineFWADensity
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Formula, assumptions, and limits

FWA=Δ4TPC,DWA=FWA1025ρdock25FWA = \frac{\Delta}{4 \cdot TPC}, \quad DWA = FWA \cdot \frac{1025 - \rho_{dock}}{25}
SymbolMeaningUnit
Δ\DeltaSummer displacementt
TPCTPCTonnes per cm immersion (SW)t/cm
ρdock\rho_{dock}Dock-water densitykg/m³

Source: Load Line Convention 1966/1988

In short

Fresh-Water Allowance (FWA) and Dock-Water Allowance (DWA) per Load Line Convention - the standard loaded-draft correction when crossing densities.

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