River ecosystems function as a unit, from the water source all the way to the river;s end. A dam, by disrupting the river’s flow, inevitably causes ecosystem harm. Dams reduce water levels below, in some cases almost dewatering entire stretches of a river. Dams block the migration of fish and vital nutrients, sometimes even upstream as in the case of salmon. Dams change water levels, often destroying shorelines or exposing the rich shallow river waters. For more details and more damages see the link below.
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