UKTAG first published guidance on the classification of ecological potential in 2008. This guidance included lists of mitigation measures relevant to the range of adverse impacts on the water environment that the different water uses can have. For impoundments for the purposes of water storage and supply, 12 mitigation measures were identified. These recommendations supersede the existing guidance on assessing whether a measure is in place and adequate for 3 of these 12 mitigation measures, and have been determined following consultation and a stakeholder workshop throughout 2013.
Water bodies identified as being at significant risk of failing to achieve good ecological status because of modifications to their hydromorphological characteristics resulting from past engineering works, including impounding works, were provisionally identified as heavily modified for the Artic