What is a possible consequence of removing a dam?

Removing a dam can lead to better fish migration patterns. Dams often block the natural pathways that fish use to migrate for spawning and feeding. When a dam is removed, it restores the natural flow of the river, allowing fish to move freely upstream and downstream. This open passage can help to improve fish populations and overall aquatic ecosystem health, leading to better biodiversity in the area.

In contrast, while increased sedimentation in the reservoir may occur as a result of dam removal, this consequence does not directly benefit the ecosystem. Higher flood risks in upstream areas can also be a concern, depending on the location and dynamics of the watershed. More recreational boating opportunities could be a potential positive outcome, but it is not as direct a consequence as the restoration of fish migration patterns. Therefore, the enhancement of fish migration represents a significant ecological benefit following dam removal.