Table 21.8 Impact Significance Matrix Sensitivity


High High


Medium Low


Major Major


Moderate Negligible Minor Medium Major


Moderate Minor


Negligible


Magnitude Low


Moderate Minor Minor


Negligible Negligible Minor


Negligible Negligible Negligible


No change


No impact No impact No impact No impact


39. Where an impact has been assessed as major or moderate, this has been deemed to be significant for the purpose of the Environmental Impact Assessment. Where an impact has been assessed as minor, negligible or no impact, this has been deemed as not significant in terms of the EIA.


40. Embedded mitigation and existing commitments to good practice are discussed in section 21.3.3, and are referred to throughout the impact assessment. The impact assessment takes into account the embedded mitigation before coming to a conclusion of the potential impact to a receptor. If any additional mitigation is required, this is included within the impact assessment in section 21.6, and a description of any residual impact post-mitigation is provided.


21.4.4 Cumulative Impact Assessment 41.


For a general introduction to the methodology used for the Cumulative Impact Assessment, please refer to Chapter 6 Environmental Impact Assessment methodology. This chapter will focus on those cumulative impacts that are specific to water and flood risk.


42.


The further details of the methods used for the cumulative impact assessment, see section 21.7.


21.4.5 Transboundary Impact Assessment 43.


21.5 Existing Environment 44.


There are no transboundary impacts in relation to water resources and flood risk.


The characterisation of the existing environment is undertaken using data sources listed in Table 21.3 plus other relevant literature.


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 21 Water Resource and Flood Risk Page 20


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