NPS requirements
Where necessary, assessment of the effects on the subtidal environment should include:
1. Loss of habitat due to foundation type including associated sea bed preparation, predicted scour, scour protection and altered sedimentary processes;
2. Environmental appraisal of inter-array and cable routes and installation methods;
3. Habitat disturbance from construction vessels’ extendible legs and anchors;
4. Increased suspended sediment loads during construction; and
5. Predicted rates at which the subtidal zone might recover from temporary effects.
Construction and decommissioning methods should be designed appropriately to minimise effects on subtidal habitats, taking into account other constraints. Mitigation measures which the Infrastructure Planning Commission (IPC) (now the Planning Inspectorate) should expect the applicants to have considered may include:
Surveying and micrositing of the export cable route to avoid;
1. Adverse effects on sensitive habitat and biogenic reefs;
2. Burying cables at a sufficient depth, taking into account other constraints, to allow the sea bed to recover to its natural state; and
3. The use of anti-fouling paint might be minimised on subtidal surfaces, to encourage species colonisation on the structures.
Where cumulative effects on subtidal habitats are predicted as a result of the cumulative effects of multiple cable routes, it may be appropriate for applicants for various schemes to work together to ensure that the number of cables crossing the subtidal zone is minimised and installation/ decommissioning phases are coordinated to ensure that disturbance is reasonably minimised.
Preliminary Environmental Information May 2014
Section 2.6.120 of NPS EN- 3
EATL are working with representatives of the Greater Gabbard Offshore Wind Farm and Galloper Wind Farm to agree appropriate methods for cable crossings to minimise impacts
Section 2.6.119 of NPS EN- 3
NPS reference
Section 2.6.113 of NPS EN- 3
Section Reference
1. Section 10.6.2 2. Section 10.6 3. Section 10.6.1 and 10.6.2
4. Section 10.6.1 5. Section 10.6.1
1. section 10.3.3 2. section 10.3.3 3. section 10.6.2.5
Colonisation of hard substrate would represent a change to the baseline environment is therefore not considered desirable.
East Anglia THREE Offshore Windfarm
Chapter 10 Benthic Ecology Page 19
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