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Draft Change with Water Density

How much the draft changes when a ship moves between water densities - sea to fresh, fresh to brackish, arctic to tropic.

StabilityDraft
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Formula, assumptions, and limits

ΔT=Tρ1ρ2ρ2\Delta T = T \cdot \frac{\rho_1 - \rho_2}{\rho_2}
SymbolMeaningUnit
TTCurrent draftm
ρ1\rho_1Current densityt/m³
ρ2\rho_2New densityt/m³
ΔT\Delta TDraft changem

Source: Derrett & Barrass Ch.8; IMO ICLL 1966

In short

Compute draft change when a ship moves between water densities.

Learn the theory Intact stability