Brackish water interpolation between FWA (fresh) and zero (sea).
Formula
$$ \text{DWA} = \text{FWA} \cdot \frac{1025 - \rho_{dw}}{25} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $FWA$ | Fresh water allowance | mm | loadline certificate |
| $\rho_{dw}$ | Dock-water density | kg/m³ | hydrometer reading |
| $DWA$ | Dock water allowance | mm | result |
Sources
- IMO ICLL 1966.
- Derrett & Barrass Ch.8.