How can streams be physically manipulated?

Streams can be physically manipulated through various methods, such as channelization, dam construction, and bank stabilization. Channelization involves altering the stream's path to improve flow or reduce flooding, while dams can control water levels and flow rates for irrigation or hydropower. Additionally, bank stabilization techniques, such as riprap or vegetation planting, help prevent erosion and maintain the stream's integrity. These manipulations can significantly impact the stream's ecosystem, water quality, and surrounding habitats.