21 WATER RESOURCE AND FLOOD RISK
21.1 Introduction 1.
This chapter considers the potential impacts of the proposed East Anglia THREE project on water resources and flood risk. It provides an overview of existing groundwater and surface water conditions. The chapter focuses on both water quality and water levels and flows and an assessment of the potential impacts to these receptors from construction, operation and decommissioning activities. The presence of potential contamination is considered in the context of hazard posed to controlled waters (groundwater and surface water) as a result of activities proposed during construction, operation and decommissioning phases.
2.
The chapter provides an assessment of the potential impacts of two scenarios for installing the onshore cables for East Anglia THREE and considers cumulative impacts of existing and proposed projects. Further information regarding the general approach taken towards impact assessment is discussed in Chapter 6 Environmental Impact Assessment Methodology. Consistent with this approach topic specific receptor sensitivity and magnitude of effect definitions have been provided within section 21.4. This chapter has been prepared by Royal HaskoningDHV.
3. 4.
National Policy Statement (NPS) guidance in relation to water resources and flood risk is discussed in section 21.4.1.
It should be noted that this chapter has the potential to interact with other chapters within the Preliminary Environmental Information Report (PEIR), these are covered as follows:
Chapter 8 Marine Water and Sediment Quality; Chapter 19 Soils, Geology and Ground Condition; and Chapter 23 Ecology.
5.
The onshore electrical transmission works for East Anglia THREE fall within the same area covered by the assessment of East Anglia ONE, therefore, the data collected for that project inform the baseline for this assessment.
21.2 Consultation 6.
Consultation undertaken to date is provided in Table 21.1. The consultation includes responses from consultees in relation to the East Anglia THREE Offshore Windfarm. Appendix 21.1 considers the consultation undertaken for East Anglia ONE PEIR (RSK
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 21 Water Resource and Flood Risk Page 1
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