What is a common physical BMP used in erosion and sediment control?

• A. Concrete barriers
• B. Straw bales or silt barriers
• C. Plastic sheeting
• D. Sandbags

Answer: (B)

Straw bales or silt barriers are commonly used as best management practices (BMPs) for erosion and sediment control due to their effectiveness in trapping sediment and controlling runoff. These materials can slow down water flow, allowing sediment to settle out before it can be carried away by stormwater, thus reducing pollution in nearby water bodies. Straw bales, in particular, are biodegradable and can integrate into the environment, providing both physical barriers to sediment movement and contributing to soil health when they decompose.

Concrete barriers, while they can serve in erosion control, are typically more rigid and may not provide the same level of sediment filtration as organic materials. Plastic sheeting is often used for various purposes, such as controlling moisture, but it does not have the ability to filter sediment effectively. Sandbags can be effective for controlling water flow, but they are generally not as efficient as straw bales in managing erosion and sediment directly. Therefore, the use of straw bales or silt barriers is specifically suited for handling erosion and sediment control challenges in stormwater management.