Which is NOT a limitation of sediment barriers?

Sediment barriers are primarily designed to trap sediment and control the flow of water on a construction site or an area subject to erosion. Understanding their limitations is essential for their appropriate application.

The statement indicating that sediment barriers are effective for controlling concentrated flow is accurate and highlights a primary function of these barriers. They are specifically designed to handle situations where water flow is focused or concentrated, helping to prevent sediment from being transported downstream. When properly installed, sediment barriers can divert or slow down concentrated flows, allowing sediment to settle out before it can enter larger bodies of water.

In contrast, the other statements outline actual limitations of sediment barriers. For instance, the need to place them along slope contours helps optimize their performance against erosion. Additionally, they are not suitable for long flow lengths since they can become overwhelmed and ineffective, leading to sediment bypassing the barrier. Furthermore, their efficiency decreases with large contributing areas, indicating that they are best suited for smaller, controlled environments.

By examining the statements regarding sediment barriers, it becomes clear that the assertion about their effectiveness in controlling concentrated flow is valid and underscores a key advantage of using these structures in erosion control practices.