  


Duration; Frequency of occurrence; and


Reversibility (i.e. the capability of the environment to return to a condition equivalent to the baseline after the effect ceases).


125. The magnitude of effect has been assessed using expert judgement and described with a standard semantic scale. Definitions for each term are provided in Table 7.13. These expert judgements regarding magnitude of effect are closely guided by the conceptual understanding of baseline conditions presented in detail in Appendix 7.2, which is also summarised in section 7.5.


Table 7.13 Example Definitions of the Magnitude Levels for a Generic Receptor Magnitude


Definition High


Scale: A change which would extend beyond the natural variations in background conditions.


Duration: Change persists for more than 10 years. Frequency: The effect would always occur. Reversibility: The effect is irreversible.


Medium


Scale: A change which would be noticeable from monitoring but remains within the range of natural variations in background conditions.


Duration: Change persists for 5-10 years. Frequency: The effect would occur regularly but not all the time. Reversibility: The effect is very slowly reversible (5-10 years).


Low


Scale: A change which would barely be noticeable from monitoring and is small compared to natural variations in background conditions.


Duration: Change persists for 1- 5 years. Frequency: The effect would occur occasionally but not all the time. Reversibility: The effect is slowly reversible (1- 5 years).


Negligible


Scale: A change which would not be noticeable from monitoring and is extremely small compared to natural variations in background conditions.


Duration: Change persists for <1 year. Frequency: The effect would occur highly infrequently. Reversibility: The effect is quickly reversible (<1 year).


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm Chapter 7 Marine Geology, Oceanography and Physical Processes Page 29


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