Certified Storm Water Operator Practice Exam

Which consequence is a direct result of erosion and sedimentation?

1. Increased biodiversity in aquatic systems

2. Loss of fertile topsoil

3. Improved water quality in lakes

4. Higher crop yields

The correct answer is: Loss of fertile topsoil

Loss of fertile topsoil is a direct consequence of erosion and sedimentation. Erosion occurs when soil is displaced from its original location, typically due to wind, water, or human activity. This process often removes the nutrient-rich top layer of soil, which is essential for plant growth and agricultural productivity. When topsoil is eroded, not only is the soil's fertility diminished, but this can also lead to increased sedimentation in nearby water bodies as the displaced soil gets washed away. Sedimentation can further disrupt aquatic ecosystems, affecting both water quality and habitat availability for various species. While increased biodiversity, improved water quality, and higher crop yields might seem beneficial, they do not result directly from erosion and sedimentation. In fact, the opposite is often true; erosion typically degrades soil quality and leads to poorer water quality due to increased runoff of nutrients and sediment into water systems. Thus, the loss of fertile topsoil stands out as the consequence directly associated with these processes.