This document describes the Level of Fouling (LoF) scale that is used to assess the level of biofouling on a vessels wetted hull surface.
This LoF scale has been used to define 'light fouling' in the Marine Pathway Plan. In the plan 'Light fouling' is defined as: small patches (up to 100mm in diameter) of visible fouling, totalling less than 5% of the hull and niche areas. A slime layer and/or any species of barnacles are allowable fouling. This is equal to an LoF 2.