11.1.1 Green water is taken to mean the overtopping by water in severe wave
conditions, resulting in loading on the deck structure and any exposed equipment.
Significant amounts of green water will have an impact on the vessel deck structural
design, accommodation superstructure, equipment design and layout and may induce
vibrations in the hull. The effects of green water loading should be accounted for,
where applicable.
11.1.3 Appropriate measures should be considered to minimise green water
effects on the structure and critical equipment, including bow shape design, flare,
breakwaters and other protective structure such as turret housings. Adequate
drainage arrangements must also be provided, see also
Pt 4, Ch 7, 10 Scuppers and sanitary discharges.
11.1.4 Wave slamming effects should be taken into account for both hull and
mooring structure design. Locations on the hull which may be subject to effects of
wave impact include the forward bottom and bilge structure, stern structure, bow
flare and bow side. The effects of slamming on the structure should be considered in
design, particularly with regard to enhancement of global hull girder bending
moments and shear loadings induced, local strength aspects and limitations to
ballast draft conditions.
11.1.5 It is recommended that provisions are made during model testing, for
measurement of both green water loading and wave slamming pressures which can be
used for local structural design.