What is the primary purpose of river training structures?

Answer: B — To alter flow of the river

The primary purpose of river training structures is to alter the flow of the river. River training structures, such as dikes, levees, or spurs, are engineered features designed to modify the natural flow characteristics of a river. These modifications can help direct water flow towards designated areas, prevent erosion, control sediment deposition, and manage flood risks by guiding water through specific paths. By achieving controlled flow, these structures support various objectives, including navigational safety, flood management, and shoreline protection. While enhancing aquatic life is a beneficial side effect of some river training structures, it is not their fundamental purpose. The aim is not to increase overall water flow but to shape and direct existing flow patterns effectively. Similarly, while they can have implications for bridge foundation stability, that is not their primary intention.