86e61584-533e-4ca8-bcb9-5c7071490da1 eng series The Crown Estate +44 020 7851 5000 16 New Burlington Place London W1S 2HX United Kingdom mde@thecrownestate.co.uk http://www.thecrownestate.co.uk pointOfContact 2014-06-04 MEDIN Discovery Profile 2.3.8 2008, Emu Ltd, Kentish Flats Offshore Windfarm Post-Construction Swath Survey 2008-03 publication K Flats 31780-05-1.doc In accordance with the FEPA licence, there is a requirement to undertake pre-construction and postconstruction surveys of a selection of turbine locations and the associated cable corridors to determine rates of scour after construction. Emu Limited was commissioned by Kentish Flats Ltd. to carry out a series of hydrographic surveys spaced at 6 monthly intervals both before and after construction to achieve this requirement. This report represents the data from the seventh such survey, the sixth since construction of the turbine foundations. The fieldwork was performed between on 2nd and 5th November 2007 by our subcontractor Port of London Authority (PLA) using the survey vessel Verifier. Depth data were acquired by a multibeam system fully integrated with motion sensor and navigation software. In general the seabed levels, as in the five previous post-construction surveys, do not show any significant change beyond the areas close to the turbine bases. The scour at the turbine bases ranges from 1.5m to 1.9m indicating little or no change from the previous survey in March 2007. Backfill continues slowly at each of the depressions caused by the jack-up platforms used during construction. This ranges from 0.1m to 0.2m in the last 6 months. A new set of four spudcan depressions has appeared to the south east of turbine E2. These show between 0.2m and 0.3m increase in depth. No depth changes have been noted along the cable corridors. Vattenfall Wind Power Ltd +44 (0) 1434 611300 Bridge End Hexham NE46 4NU United Kingdom info@vattenfall.com http://www.vattenfall.com custodian EMU Limited - Head Office +44 (0) 1489 860 050 +44 (0) 1489 860 051 1 Mill Court, The Sawmills mail@emulimited.com originator notPlanned Post-Construction monitoring The Crown Estate Renewable Energy Development Phases 2012-05-15 revision 1 Bathymetry and Elevation SeaDataNet Parameter Discovery Vocabulary 2014-05-27 revision 84 Marine Environmental Data and Information Network Marine Environmental Data and Information Network Renewable Energy Lease area The Crown Estate Renewable Energy Development Areas 2012-05-15 revision 1 http://www.marinedataexchange.co.uk/pages/terms-of-use.aspx copyright copyright otherRestrictions http://www.marinedataexchange.co.uk/pages/terms-of-use.aspx http://www.marinedataexchange.co.uk/pages/terms-of-use.aspx eng environment oceans 1.0323 1.0804 51.2682 51.2843 2007-11-02 2008-03 series The survey was conducted without incident and all requirements were met. https://www.marinedataexchange.co.uk/details/803/summary A link to the web service or dataset. https://www.marinedataexchange.co.uk A link to the general host site.