I think everything has a negative impact, good and bad, for and against, primary and secondary, short and long term.
Of course, now the advantages of hydropower far outweigh the disadvantages, but I think there are still negative effects. For example, the cascading development of hydropower slows the flow of water in rivers and carries sediment. , and transforms living water into stagnant water; the existence of dams Aquatic animals are confined to a certain area and forced to change their living environment; the life of downstream populations is directly linked to the survival of the large flow dam; -head power plant...
Haha, personal opinion