Are there any downsides to hydroelectric power?

For this question, we first need to understand the principle of hydropower generation: The basic principle of hydropower generation is to use the difference in water level to produce electricity with a hydropower generator, that is to say, use the potential energy of water to convert the potential energy of water into the mechanical energy of the water wheel, and then use the mechanical energy to drive the water production machine. electricity and get electricity. Therefore, electricity generation itself relies on the impact force of the water to drive the turbine, resulting in no physical change in water quality. The disadvantages are: ecological damage: increased water erosion downstream of the dam, changes to the watercourse and impact on fauna and flora, etc. Dams are needed for resettlement, big investments in infrastructureare needed and the fertile alluvial soils downstream are reduced due to erosion, causing water changes.