What is a riparian buffer and how does it protect water resources?

• A. A vegetated strip along a watercourse that filters runoff, stabilizes banks, reduces erosion, shades streams, and provides habitat.
• B. A concrete barrier along a stream channel.
• C. A dry, unvegetated buffer strip to allow drainage.
• D. A pipe drainage channel.

Answer: (A)

Riparian buffers are vegetated strips along rivers or streams that act as living filters at the land–water edge. The plants trap sediments and absorb nutrients and pollutants from runoff, while their roots stabilize banks to reduce erosion. The canopy shades the water, helping keep temperatures lower and aquatic life healthier, and the dense vegetation increases infiltration and slows runoff, which reduces pollutant transport and flood peaks. These buffers also provide wildlife habitat, supporting ecosystem health. The other options describe structures or bare, non-vegetated areas that do not filter pollutants, stabilize banks, or shade the water, so they do not protect water resources in the same way.