HomeCalculatorsDock Water Allowance (DWA)

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.

StabilityLoadline

Inputs

Fresh Water AllowancemmFrom the FWA calculator or loadline certificate.Dock water densitykg/m³Typical harbour brackish water 1010–1020 kg/m³.

DWA

120mm

Formula, assumptions, and limits

Linear interpolation between FWA (ρ = 1000) and zero (ρ = 1025). Applies in the port until the ship enters full sea water - at which point the Summer load line must emerge.