The Water Directors of European countries agreed to set up a specific Ad-hoc Task Group (ATG) on best practice and guidance to deal with hydromorphology. One of the core activities of the Working Group (WG) ECOSTAT of the WFD CIS has been to compare the ecological quality expected by different countries for water bodies impacted by water storage. This report is based on information collected via a template on mitigation measures for water bodies impacted by water storage, which was completed by 23 countries.

<p>In the latest Work Programme 2016-2018 of the Common Implementation Strategy of the Water Framework Directive (WFD), the Water Directors of European countries agreed that a specific Ad-hoc Task Groups (ATG) should be set up on best practice and guidance on dealing with hydromorphology. Ecologic Institute has been commissioned by the Norwegian Environment Agency to provide to support and advice in the preparation of a report on the comparison of mitigation measures for the definition of good ecological potential (GEP) of heavily modified water bodies (HMWB).</p>&#13;