Wall-sided draft scaling with water density; ship sinks when density drops.
Formula
$$ \Delta T = T \cdot \frac{\rho_1 - \rho_2}{\rho_2} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $T$ | Current draft | m | draft marks |
| $\rho_1$ | Current density | t/m³ | hydrometer |
| $\rho_2$ | New density | t/m³ | hydrometer |
| $\Delta T$ | Draft change | m | result |
Sources
- Derrett & Barrass Ch.8.
- IMO ICLL 1966.