Dock Water Allowance (DWA)

Loadline draft correction for brackish water. When the ship's dock-water density lies between 1.000 and 1.025, the Summer load line may be submerged by the dock water allowance without violating ICLL.

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

\text{DWA} = \text{FWA} \cdot \frac{1025 - \rho_{dw}}{25}

Symbol	Meaning	Unit
$FWA$	Fresh water allowance	mm
$\rho_{dw}$	Dock-water density	kg/m³
$DWA$	Dock water allowance	mm

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

In short

Loadline DWA for brackish water from FWA and dock water density.

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