18.4.2.2 Magnitude 25.


The magnitude of effect has been considered in terms of the spatial extent, duration and timing of the effect in question. Four levels of magnitude (high medium, low and negligible) are considered with example definitions for a generic receptor provided in Table 18.8.


Table 18.8 Definitions of the Magnitude Levels for a Generic Receptor Magnitude


Definition High Medium Low Negligible No change


Loss of resource and/or quality and integrity of resource; severe damage to key characteristics, features or elements


Loss of resource, but not adversely affecting integrity of resource; partial loss of/damage to key characteristics, features or elements


Some measureable change in attributes, quality or vulnerability, minor loss or, or alteration to, one (maybe more) key characteristics, features or elements


Very minor loss or detrimental alteration to one or more characteristics, features or elements


No change from the baseline or existing environment.


18.4.2.3 Impact significance 26.


Following the identification of receptor value and sensitivity and magnitude of the effect, it is possible to determine the significance of the impact, as shown in the matrix in Table 18.9. This matrix is used 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.


27.


For each of the impacts identified in section 18.7 criteria, including sources and justifications, for quantifying the different levels of impact are provided. Where possible, this is based upon quantitative and accepted criteria, together with the use of value judgement and expert interpretation to establish to what extent an impact is significant.


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 18 Infrastructure and other users Page 16


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