27. With respect to duration of potential impacts, those associated with construction are considered to be short term, occurring over a maximum of 2.5 years. Impacts associated with operation are longer term, occurring over the operational lifetime of the proposed East Anglia THREE project.


Table 11.5 Definitions of Magnitude of Effect Magnitude


Definition High Medium Low


Fundamental, permanent / irreversible changes, over the whole receptor, and / or fundamental alteration to key characteristics or features of the particular receptors character or distinctiveness.


Considerable, permanent / irreversible changes, over the majority of the receptor, and / or discernible alteration to key characteristics or features of the particular receptors character or distinctiveness.


Discernible, temporary (throughout project duration) change, over a minority of the receptor, and / or limited but discernible alteration to key characteristics or features of the particular receptors character or distinctiveness.


Negligible


Discernible, temporary (throughout project duration) change, over a minority of the receptor, and / or limited but discernible alteration to key characteristics or features of the particular receptors character or distinctiveness.


No Impact No loss of extent or alteration to characteristics, features or elements.


11.4.3.6 Impact significance 28.


Table 11.6 applies the significance criteria to the assessment of an effect, taking into account the magnitude of effect and sensitivity of the receptor. In the context of impacts on fish and shellfish receptors, a low magnitude combined with a low sensitivity results in a minor significance. Those effects which are moderate or major are considered significant with respect to Environmental Impact Assessment (EIA) assessments.


29.


The matrix is seen as a framework to aid understanding of how a judgement has been reached from the narrative of each impact assessment and it is not a prescriptive formulaic method. To some extent defining impact significance is therefore qualitative and reliant on professional experience, interpretation and judgement.


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 11 Fish and Shellfish Page 23


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