Sedimentation mitigation from runoff is best addressed by which practice?

• A. Buffer strips and riparian zones.
• B. Cover cropping and reduced tillage.
• C. Integrated pest management.
• D. Erosion control and conservation practices.

Answer: (D)

Sedimentation from runoff is minimized most effectively by controlling soil erosion and applying conservation practices across the landscape. When you implement erosion control and conservation practices, you’re addressing the main pathways by which soil particles are detached, transported, and deposited into waterways. This includes methods that stabilize soil, slow and filter runoff, and intercept flow before it reaches streams—such as contour farming, terraces, grassed waterways, buffer strips, and cover crops. These strategies work together to reduce erosion risk, trap sediment, and improve water quality.

Buffer strips and riparian zones are important components because they filter sediment near waterways, but they are specific measures within the broader set of practices. Cover cropping and reduced tillage help lower soil loss and improve soil structure, yet they don’t always address all erosion pathways or the hydrological routing of runoff. Integrated pest management mainly targets pest control and has indirect benefits for soil health, but it does not focus on sediment control. Therefore, the broad category of erosion control and conservation practices best covers the range of approaches needed to mitigate sedimentation from runoff.