Table 21.7 Example Definitions of the Magnitude Levels for a Generic Receptor Receptor
Criteria High Hydrogeology
Major change from the baseline conditions. Major permanent or long-term change to groundwater quality or available resource. The quality and / or quantity of the existing resource is impacted beyond repair. Changes to quality or water levels would have a significant impact upon ecological designated sites.
Medium
Changes to the local groundwater regime are predicted to have a slight impact on resource use but not derogate any existing abstractions. Minor impacts on local and regionally important ecological sites may result.
Low
Changes to groundwater quality, levels or yields would only have minor, short-term impact on existing resource use or ecology.
Negligible
Negligible change to groundwater baseline conditions approximating to a ‘no change’ situation.
21.4.3.3 Impact significance 37.
Hydrology (Surface Water Quality)
Impacts result in ‘widespread’ water quality deterioration resulting in a deterioration in the WFD status of the water body.
Significant change in water flow leading to damage to fisheries or sensitive habitats.
Impact to water quality limited in spatial extent so that it does not constitute deterioration in the water body status.
Change in water flow but limited in temporal extent so that there is no damage to fisheries or sensitive habitats.
Impact to water quality limited in spatial and temporal extent so that it does not constitute deterioration in the WFD water body status.
No measurable change in flow.
No discernable change in water quality.
No measurable change in flow.
Following the identification of receptor sensitivity and magnitude of the effect, it is possible to determine the significance of the impact. A matrix as presented in Table 21.8 will be used wherever relevant.
38.
The impact significance is then determined by considering magnitude in relation to the sensitivity of the receptor impacted, as demonstrated by the matrix presented in Table 21.8.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 21 Water Resource and Flood Risk Page 19
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