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In page Water turbine:

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Negative consequences of water turbines are mostly associated with the dams normally required for their operation. Dams alter the natural ecology of rivers, potentially killing fish, stopping migrations, and disrupting livelihoods. Dams also cause less obvious, but potentially serious, consequences, including increased evaporation of water (especially in arid regions), buildup of silt behind the dam, and changes to water temperature and flow patterns. In the United States, it is now illegal to block the migration of fish, so fish ladders for species such as salmon and white sturgeon must be provided by dam builders.[citation needed]