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4.9.        Environmental flows  

A flow regime which is based on environmental requirements is a prerequisite to reach good ecological status in rivers (EC, 2016). Establishing ecologically-based flow regimes is therefore an important measure in the RBMPs (EC, 2019b). In most Member States, the work on defining and implementing environmental flows was still ongoing in the second cycle (EC, 2019b). In the second RBMPs, environmental flows have been reported to be derived and implemented for all relevant water bodies only in three Member States. In the majority of Member States, environmental flows have been derived and implemented only for a subset of the total water bodies, either in all or in part of their RBDs (Table 4.6).