32.
Hydrology, including drains, ditches, ordinary watercourses, main rivers as well as ponds and lakes;
Hydrogeology, including the type of aquifers and potential groundwater flow direction beneath the site and surrounding area; and
The presence of groundwater Source Protection Zones (SPZ).
In order to fully understand the hazard posed to groundwater and surface water information from Chapter 19 Soils, Geology and Ground Condition, regarding the type of geology and potentially contaminative sources present within the study area, has been used to aid this assessment.
33. A flood risk screening assessment and watercourse assessment has been undertaken through a desk based study of available data (using the data sources listed in Table 21.5). A site walkover will be also undertaken to verify the desk-based assessment of the watercourse crossings and to carry out visual appraisal of the watercourse crossing sites. This will incorporate a walkover of the landfall location and key accessible areas of the onshore cable routes close to the crossing locations. A photographic record of the site walkover survey will be provided in the final ES Chapter. This walkover is required due to potential changes of access required for Scenario 1 and therefore is dependent on the outcome of the consultation for PEI.
34. An FRA will be completed, building on the findings of that undertaken for East Anglia ONE and conclusions will be incorporated into the final ES Chapter. The FRA will examine the existing environment through a site visit, consultation with relevant bodies including the Environment Agency and the Local Lead Flood Authority (LLEA) and review of relevant documentation to identify potential sources of flooding.
21.4.3.1 Sensitivity 35.
The general approach taken towards impact assessment is discussed in Chapter 6 Environmental Impact Assessment Methodology. Consistent with this approach, the sensitivity of each topic specific receptor has been considered based on the criteria presented in Table 21.6. The impact assessment has, therefore, been undertaken with reference to the definitions provided in Tables 21.6, 21.7 and 21.8.
Table 21.6 Definitions of Receptor Sensitivity Definition
Sensitivity High
Hydrogeology (Groundwater)
Site within a groundwater Source Protection Zone (SPZ) 1
Principal Aquifer
Preliminary Environmental Information May 2014
Hydrology (Surface Water)
Water body classed as high (ecological quality) under the WFD.
Site is within hydraulic continuity East Anglia THREE Offshore Windfarm
Chapter 21 Water Resource and Flood Risk Page 17
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