Fresh-Water Allowance (FWA) and Dock-Water Allowance (DWA) per Load Line Convention - the standard loaded-draft correction when crossing densities.
Formula
$$ FWA = \frac{\Delta}{4 \cdot TPC}, \quad DWA = FWA \cdot \frac{1025 - \rho_{dock}}{25} $$Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $\Delta$ | Summer displacement | t | load-line certificate |
| $TPC$ | Tonnes per cm immersion (SW) | t/cm | hydrostatic tables |
| $\rho_{dock}$ | Dock-water density | kg/m³ | hydrometer |
Sources
- Load Line Convention 1966/1988.