Which runoff measure is effective for controlling erosion?

Slope drains are an effective measure for controlling erosion because they facilitate the controlled movement of surface runoff down steep slopes, thereby reducing the velocity and energy of water flow. This helps to prevent the detachment and transportation of soil particles, which are primary causes of erosion. By channeling runoff away from disturbed or vulnerable areas, slope drains can significantly reduce the likelihood of erosion occurring in these locations.

In contrast, underground drainage pipes may help manage water table levels but are not specifically designed for surface runoff management or erosion control. Concrete barriers, while they can redirect water flow, often lead to increased runoff velocity and can contribute to erosion if not designed properly. The effectiveness of slope drains in managing runoff and reducing erosion makes them a suitable choice in erosion control strategies.