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Removal of large rocks
from a stream can decrease the stream's resistance to flow. This results
in an increase in the stream's velocity.
Increased velocity can cause downstream flooding. In addition, the removal
of large rocks often leaves a stream bed with small, uniform-size rocks.
This destroys important habitats of aquatic plants, fish,
Dredging is generally performed with large machinery. Large machines in small streams disrupt the stream bed and cause a short-term siltation event. The siltation event can be harmful to downstream aquatic communities. Siltation is observed as increased turbidity . Increased turbidity can lead to increased water temperature.
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