Goldsmith, BJ; Hughes, MJ; Shilland, EM; (2009) Habitats Directive assessment of Llyn Anafon with respect to proposed water level changes. (ECRC Research Report 138 ). UCL Environmental Change Research Centre: London, UK.

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Abstract

This report was commissioned by Mott MacDonald in response to concerns over the structural integrity of the dam at Llyn Anafon, a now disused water supply reservoir owned by Dwr Cymru Welsh Water and lying within the Eryri Special Area of Conservation (SAC), North Gwynedd, Wales (SH697698). Llyn Anafon is classified as “Oligotrophic to mesotrophic standing waters with vegetation of the Littorelletea uniflorae and/or of the Isoëto-Nanojuncetea” under the EU Habitats Directive. It has an exceptional characteristic and distinctive aquatic flora that includes two extremely rare Potamogeton (Pondweed) hybrids. Water quality is also very high and the site is arguably one of the best examples of this habitat type within the SAC. Recent work commissioned under Section 10 of the Reservoirs Act 1975 identified significant seepage from the dam with a significant loss of fine material, with potential implications for the safety of the structure. The report recommended the water level be lowered by 1.0 m with immediate effect and that a long term solution to the defective dam be sought. The resultant lowering of the water level has had a direct impact on the otherwise favourable condition of the site and places the habitat and species therein at risk.

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