The second step is to lessen the environmental impact of existing plants through plant environmental refurbishment. From ecological flows to acquiring knowledge on fish migration patterns, hydropower plants can be adapted and managed in a more nature- sensitive manner, as illustrated by a case study on the Allier River in the Loire Valley, France.
The third step is the restoration of the rivers’ natural functions,
in particular continuity and habitats. The case study on the construction of a reproduction channel next to the Imatra hydropower plant in Finland, illustrates active restoration measures that should be taken to complement mitigation measures at the plant itself.
download the WWF Report : https://www.wwf.eu/what_we_do/water/?uNewsID=2329866