North Carolina Building Contractor License Practice Exam

Where is sediment most effectively controlled?

1. In temporary barriers

2. Ponds

3. Permanent ground cover

4. Underground storage

The correct answer is: Permanent ground cover

Sediment is most effectively controlled in areas with permanent ground cover. This is because permanent ground cover stabilizes the soil and reduces erosion by providing a protective layer over the surface. The roots of plants help bind the soil together, which minimizes the direct impact of rain on the soil surface, thus reducing the chances for sediment to be dislodged and transported by water. When soil is left exposed, it can easily wash away with rainfall or be blown away by wind, leading to increased sedimentation in nearby water bodies or on construction sites. Permanent ground cover, such as grass, shrubs, or other vegetation, ensures that the soil is held in place, retains moisture, and supports a healthier ecosystem which further aids in sediment management. While temporary barriers, ponds, and underground storage can be useful for sediment control, they are generally more effective as supplemental methods rather than as primary solutions. Temporary barriers may be installed during construction but do not provide a long-term solution. Ponds can collect sediment, but if not properly maintained, they can become overwhelmed or ineffective. Underground storage can manage water but does not inherently address the issue of surface erosion and sediment control. Thus, permanent ground cover remains the most effective means for controlling sediment in the environment.