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Rivers and Streams and Standing Open Water (including ponds) are listed as Broad Habitats and Reed beds are listed as Priority Habitats on the UKBAP and LBAP and so all rivers, reed beds and ditches must be considered to have both national and local importance. Current proposals show that the majority of crossings will be by open cut methods with some crossings using non-open cut methods (as shown in Figure 24.10.2). Direct impacts on the rivers and ditches from open cut methods will require work under a method statement with impacts fully mitigated. This will include the installation of fencing to protect the ditch banks and silt netting to protect the ditches from construction runoff during site works.
4.2 Aquatic Invertebrate Assemblages
Whilst some of the invertebrate assemblages present (the four Local species) may have a restricted distribution within the UK, the majority of species present are considered common within suitable habitats.
The presence of Local species adds to the
conservation value of the waterbodies however no Notable or Rare species were recorded. At many sites, the lack of a diverse aquatic vegetation assemblage has resulted in a restricted invertebrate diversity.
It is important to note, however, that these results are based on a single summer survey and invertebrate diversity is likely to be higher than has been recorded in these samples. However, given the results and that the survey was undertaken in the optimum period, no further surveys are deemed to be required.
East Anglia Offshore Wind Limited
East Anglia ONE Offshore Windfarm – Aquatic Invertebrate Survey 854188 (Rev 02)