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Table 5.24 Indicative East Anglia THREE project characteristics at landfall Landfall


Landfall location


Method for crossing intertidal Number of cables Number of ducts


Number of transition pits


Mid way between Bawdsey and the mouth of the river Deben


HDD Up to 4


Up to 4 (Scenario 2 only) Up to 4


271. Note that under Scenario 2 there would also be up to four ducts installed at the landfall for later installation of export cables for the proposed East Anglia FOUR project (as discussed in section 5.2).


272. The East Anglia THREE landfall site is characterised by exposed London clay with an eroding shingle terrace at the base of low lying cliffs (approximately 10m above ordnance datum) which are partially vegetated by grasses, gorse and other small shrubs. At the wave break point are the remnants of suspected anti-personnel barriers, associated with military coastal defence dating from World War II, which are present along the coast. There are no formal coastal defences associated with flood prevention or coastal stability at the landfall location.


5.5.2 Landfall Construction Methods 273. Under Scenario 1 ducts would already be present as these would have been installed during the construction of the proposed East Anglia ONE project. Under Scenario 2 HDD operations would be needed to install up to four ducts which would accommodate up to four export cables associated with the proposed East Anglia THREE project and up to four ducts for the proposed East Anglia FOUR project. Therefore the following paragraphs on HDD operations are only relevant for Scenario 2. Under Scenario 1, the construction of the proposed East Anglia THREE project at the landfall would be reduced to cable pulling and construction of transition pits (and in the case of the short HDD option some tracked excavator activities on the lower shore).


274. There are two options for HDD at the landfall, either the long or short HDD method. Under the long method EATL anticipates that the cable ducts would be installed from shore with a setback distance of up to 180m from the cliff top to allow for natural coastal erosion, with duct ends buried in the sea bed up to 1,100m from the base of the cliff. Cables installed within the ducts would either be connected to the offshore


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 5 Description of the Development Page 60


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