Marine Outfall Design Calculator

Estimate the structural and hydrodynamic impact of marine growth (biofouling) on offshore members — effective diameter, added weight, and drag/inertia force increases.

Inputs

Bare member OD (m)

Growth thickness (mm)

Growth density (kg/m³)

Member length (m)

Cd clean

Cd fouled

Max wave velocity (m/s)

Cm clean

Cm fouled

Tab to move between fields

Results

Effective OD with growth (m)

1.2

Total growth mass (kg)

13,736.6

Drag force increase (%)

93.8

Diameter increase (%)20

Submerged weight of growth (N/m)1,017.03

Inertia force increase (%)62

Relative roughness (e/D)0.08

How to Use This Calculator

Enter bare member outer diameter (m) and radial marine growth thickness (mm).
Enter growth density (kg/m3) — hard fouling ~1325 kg/m3 — and member length (m).
Enter drag coefficient for the clean (Cd clean) and fouled (Cd fouled) member.
Read fouled member effective diameter and additional added mass from marine growth.
Use increased drag force (kN/m) to update structural load calculations for the grouted member.

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