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o Foundations (Turbine, collector station, convertor station and met mast). o Scour protection o Cable protection (including cable crossings)
The magnitude of the impact will be quantified by calculating the footprint as a percentage of each habitat within East Anglia THREE and EAST Anglia FOUR that would be lost if the entire windfarm were to be built within each habitat (worst case scenario).
It should be noted that this is an unrealistic worst case scenario and that this will lead to exaggerated percentage take figures, however this is the logical way of ensuring that the absolute worst case scenario is considered.
This will then be put into the context of the wider zone.
Assessment of the sensitivities will be guided by the assessments available on MarLIN
4.1.2.2 Physical disturbance: 31.
There is potential for physical disturbance of the seabed from jack‐up vessel legs during planned maintenance or, in the case or a cable failure, excavation of cables. In addition small localised disturbance may occur as a result of changes in physical processes instigated by the positioning of structures on the seabed. In general, the impacts from planned maintenance and changes in coastal processes should be temporary, localised and small scale and overall there would be less impact than during construction.
4.1.2.2.1 Proposed method for assessment: The ZEA provides known size of area of each habitat type across the zone which can also be augmented by the 2013 survey data and applied to the specific sites.
Calculations will be made of the area of disturbance using realistic worst case scenarios taking into account:
o Jack up legs (although they may not be used) o Cable installation (including sediment plumes and side casting)
The information generated by the physical processes chapters will be used to determine the magnitude physical disturbance through changes to the physical processes.
The magnitude of the impact will be quantified by calculating the maximum area of disturbance as a percentage of each habitat within East Anglia THREE and EAST
Evidence Plan Benthic Ecology Method Statement
East Anglia THREE & East Anglia FOUR Offshore Windfarms