• Zone 2 or ‘outer protection zone’ is defined by a 400-day travel time to the source. The travel time is designed to provide delay and attenuation of slowly degrading pollutants; and
• Zone 3 or ‘total catchment’ is the total area needed to support removal of water from the borehole, and to support any discharge from the borehole.
Information provided on the Environment Agency website indicates that three inner
zones (zone 1) are present which are crossed by the Preferred Onshore Cable Corridor Corridor. These are located near Culpho Hall, north of Akenham and north of
the
Converter Station Refined Area of Search (approximate distances crossed by the route are 600m, 1.75km and 1.5km respectively). Two further zone 1 areas are present south of the Preferred Onshore Cable Corridor, one at Tuddenham St Martin and one at Westerfield (see Figure 20.4).
Between Great Bealings and the Converter Station Refined Area of Search, the route crosses either the zone 1 areas detailed above, or is within the outer zone (zone 2).
The eastern end of the Preferred Onshore Cable Corridor, from the landfall to Great Bealings, does not cross any groundwater protection zones.
3.4 Hydrology
3.4.1 Surface watercourses The Preferred Onshore Cable Corridor crosses both fluvial and estuarine systems with associated creek networks and marshlands. The principal watercourses of interest are the River Deben, River Fynn and Lark, and the River Gipping, in addition to a number of smaller watercourses and drainage channels including a number of marshland areas to the East of the River Deben.
3.4.2 Flood zones
The EA has flood zone maps available on their website for much of England and Wales. The latest EA Flood Zone Mapping indicates that the majority of the Preferred Onshore Cable Corridor is located in Flood Zone 1, i.e. an area of low flood risk, but sections of the corridor are located in Flood zones 2 (medium risk) and Flood zone 3 (high risk of flooding) according to their proximity to watercourses.
It should be noted that a flood risk assessment has been produced as a separate document (see Volume 3, Appendix 22.1 and Volume 3, Appendix 22.2).
Formatted: Bullets and Numbering 3.4.3 Discharge consents
In terms of water quality, nine discharge consents are located close to the Preferred Onshore Cable Corridor, primarily for the release of final/treated sewage effluent from domestic properties or golf clubs. Receiving waters include the North Sea, the River Fynn, a tributary of the River Deben, the River Gipping, a ditch into the River Gipping and there is one consent for discharge to land.
East Anglia Offshore Wind Limited
Preliminary Risk Assessment, East Anglia ONE Windfarm 41388-PRA(03)
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