Fresh Water Allowance (FWA)
Loadline draft shift allowed when moving from sea water to fresh water. Loadline Convention: FWA (mm) = Δ / (4·TPC).
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Formula, assumptions, and limits
| Symbol | Meaning | Unit |
|---|---|---|
| Summer-load displacement | t | |
| Tonnes per centimetre at SLWL | t/cm | |
| Fresh water allowance | mm |
Source: IMO ICLL 1966; Derrett & Barrass Ch.8
In short
Compute Loadline FWA from displacement and TPC.