SPECIFICATION SHEET • SI METRIC
CAT: MARINE

Fresh Water & Dock Water Allowance

Calculate FWA and DWA to adjust vessel draft for water density changes.

💡 Engineering Knowledge PrimerFresh Water Allowance (FWA) and Dock Water Allowance (DWA) determine change in draft when moving between different water densities.
CALCULATION SCOPE — Deterministic calculation within the published assumptions. Independently verify all design decisions and project-specific code requirements.
Quick-Fill Material Presets
INPUT DESIGN PARAMETERS (SI)
t
t/cm
kg/m³
CALCULATED SPECIFICATION OUTPUT
Fresh Water Allowance (FWA)
250 mm
Dock Water Allowance (DWA)100 mm

Technical Methodology & Engineering Principles

GOVERNING EQUATION
FWA = W / (4 * TPC) DWA = FWA * (1025 - Density) / 25
Assumptions & Scope

Linear relationship between density and draft change.

Operating Range & Boundary

Use finite, physically meaningful inputs within the stated operating assumptions.