up one of the nearby river estuaries had been ruled out at an early stage through consultation. Further consultation (subsequent to the constraint mapping study) on the potential landfall location to the south of Harwich resulted in this option being ruled out.
30.
An engineering feasibility study was commissioned to review the two remaining cable landfall options in terms of construction and cost. This included a review of beach and seabed geology, tides and currents, fishing and anchorage interactions, potential access for cable vessels and cable protection requirements. In order to assess the movement and stability of the shoreline and shallow subtidal areas, and the effects of coastal management plans over the next 50 years, a coastal stability study was also commissioned. This study showed that the coast both north and south of the Deben is eroding and that erosion rates are likely to increase over time. The study also highlighted the instability of the sandbanks at the mouth of the Deben Estuary.
31.
After taking both the constraint mapping and the engineering feasibility study into account the eventual landfall location chosen was a small section of the Suffolk coastline near Bawdsey. In summary, this site was chosen based on consultation, appraisal of constraints and engineering feasibility. The site was deemed to be the preferred location for the following reasons:
The landfall has the potential to accommodate cable requirements for 3.6GW to connect at Bramford;
The sea off the Bawdsey landfall is relatively sheltered in comparison with the strong tidal movement around the mouth of the Deben close to the Felixstowe Ferry landfall; and
There is the potential to avoid impacts on the Site of Special Scientific Interest (SSSI) designation at Bawdsey Cliffs through the use of horizontal directional drilling (HDD).
4.4.5 Onshore Cable Route 32.
As previously discussed the onshore cable route for East Anglia THREE was selected as part of the development works for East Anglia ONE. The East Anglia THREE export cables would be installed through one of the following scenarios, both of which are assessed within the PEIR:
Scenario 1- Use of pre-installed ducts for installation of onshore cables, (ducts installed during construction of East Anglia ONE); and
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 4 Site Selection and Alternatives Page 7
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