Fresh Water Allowance (FWA)
Loadline draft shift allowed when moving from sea water to fresh water. Loadline Convention: FWA (mm) = Δ / (4·TPC).
Inputs
FWA
278mm
The Summer load line may be submerged by 0.278 m in fresh water.
Formula, assumptions, and limits
$$\text{FWA} = \frac{\Delta}{4 \cdot \text{TPC}}$$
Applies to the draft shift between sea water (1.025 t/m³) and fresh water (1.000 t/m³) at the summer load line. For brackish / dock water, use the DWA calculator which scales this result by (1025 − $ρ_{\text{dw}}$) / 25.
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