Answer:
Fish populations can be impacted if fish cannot migrate upstream past impoundment
dams to spawning grounds or if they cannot migrate downstream to the ocean. Upstream fish passage can be aided using fish ladders or elevators, or by trapping
and hauling the fish upstream by truck. Downstream fish passage is aided by
diverting fish from turbine intakes using screens or racks or even underwater lights
and sounds, and by maintaining a minimum spill flow past the turbine.
Hydropower can impact water quality and flow. Hydropower plants can cause low
dissolved oxygen levels in the water, a problem that is harmful to riparian
(riverbank) habitats and is addressed using various aeration techniques, which
oxygenate the water. Maintaining minimum flows of water downstream of a
hydropower installation is also critical for the survival of riparian habitats.
Hydropower plants can be impacted by drought. When water is not available, the
hydropower plants can't produce electricity.
New hydropower facilities impact the local environment and may compete with other
uses for the land. Those alternative uses may be more highly valued than electricity
generation. Humans, flora, and fauna may lose their natural habitat.
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