What can happen to an area upstream of a hydroelectric dam?

Upstream of a hydroelectric dam, the area can experience significant ecological and environmental changes. Water levels typically rise, creating a reservoir that can submerge land, alter habitats, and impact local wildlife. This flooding can displace communities and disrupt existing ecosystems, while also potentially leading to increased sedimentation and changes in water quality. Additionally, the altered flow of water can affect fish migration and other aquatic life downstream.