Project: A2953 Client: East Anglia Offshore Wind Limited Title:
4 Embedded Mitigation
25. As well as compliance with MGN 371 the following table notes standard industry practices that are considered embedded mitigation. The impact assessment within Chapter 15 Shipping and Navigation, as well as any assessment within the NRA considered all of the following to be embedded and significance assessed accordingly.
Table 4.1 Embedded Mitigation Mitigation
Marked on Admiralty Charts Description
The windfarm would be charted by the UK Hydrographic Office (UKHO). This could include turbines, offshore cable corridor (specific location of export cables) and inter array cables for the appropriate scale charts.
Promulgation of Information
Appropriate liaison and dissemination of information and warnings through Notices to Mariners and other appropriate media, (e.g. Admiralty Charts and fishermen’s awareness charts) would enable vessels to effectively and safely passage plan around the East Anglia THREE project.
Navigational Marking and Lighting
Structures within the windfarm would be marked and lit in accordance with International Association of Lighthouse Authorities (IALA) Recommendation O- 139 on the Marking of Man-Made Offshore Structures (IALA, 2008), but may also include the use of other visual and sounds aids to navigation as agreed with THLS.
Minimum Blade Clearance Inter-array and export cable protection
Turbines would be constructed to ensure that the minimum rotor blade clearance (air draught) is at least 2m above MHWS.
Inter-array and export cables would be protected appropriately taking into account fishing and anchoring practices and an appropriate burial protection index study. Positions of cables would be promulgated and charted by appropriate means.
Compliance with MCA’s Marine Guidance Notice (MGN) 371 including
Date: Doc:
07.05.2014 A2539 East Anglia THREE Windfarm Appendix 15.1
Annex 5 specifies ‘standards and procedures for generator shutdown and
Page: 10
East Anglia THREE– Navigation Risk Assessment
www.anatec.com
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