What is the primary purpose of a "buffer zone" in erosion control?

The primary purpose of a buffer zone in erosion control is to intercept and filter sediment and pollutants from runoff. These zones are typically composed of vegetation that stabilizes soil and slows down the movement of water, which allows sediments and pollutants to settle out before they enter water bodies. Buffer zones play a crucial role in improving water quality by acting as a natural barrier that captures runoff, thereby preventing contaminants, such as fertilizers and chemicals, from reaching streams and rivers.

Maintaining vegetative cover in these areas not only reduces the speed of surface water flow but also enhances infiltration, which further reduces erosion and sediment transport. As a result, buffer zones are essential components of effective erosion and sediment control strategies, making them a critical aspect of environmental management in both urban and rural settings.