Why is maintaining soil ground cover important for erosion control?

• A. It has no effect on erosion
• B. It reduces runoff velocity and soil loss
• C. It increases wind erosion only
• D. It only affects aesthetics

Answer: (B)

Maintaining soil ground cover is important because it creates a protective layer that absorbs raindrop energy and slows surface runoff. When the soil is bare, raindrops strike with high energy, detach soil particles, and fast-moving water can wash them away. A cover—whether live vegetation or surface litter—reduces that impact energy and increases surface roughness, which slows runoff and allows more water to infiltrate. With slower runoff, fewer particles are detached and carried away, so soil loss is reduced. Ground cover also helps shield the soil from wind, reducing wind erosion. So, keep soil covered to cut both the speed of runoff and the amount of soil that erodes, rather than assuming it has no effect, only affects aesthetics, or increases erosion in any direction.