Certified Storm Water Operator Practice Exam

What construction practice can minimize runoff and control erosion?

1. Allowing vegetation to grow freely

2. Incorporating multiple grading points

3. Utilizing temporary cover crops

4. Clearing the area completely before construction

The correct answer is: Utilizing temporary cover crops

Utilizing temporary cover crops is an effective construction practice for minimizing runoff and controlling erosion. Temporary cover crops, such as grasses or legumes, are planted in areas that will be disturbed during construction. These crops provide immediate ground cover that helps to stabilize the soil, preventing erosion from rain and wind. The roots of the cover crops bind the soil particles together, reducing the likelihood of sediment washing away from the site. Additionally, they help to improve soil health by adding organic matter and nutrients back into the soil as they decompose. This practice is particularly important in construction areas where bare soil can easily be dislodged during storm events, leading to increased sedimentation in stormwater runoff. By implementing temporary cover crops, not only is erosion controlled, but water quality is also improved, as less sediment enters nearby water bodies. In contrast, allowing vegetation to grow freely may not provide the necessary control over soil erosion since unregulated growth can lead to an uneven distribution of protection and may not be effective in the high-impact areas typical of construction sites. Incorporating multiple grading points could help manage water flow but does not directly address soil stability and erosion control. Clearing the area completely before construction exposes bare soil, which considerably increases the potential for erosion and runoff, leading to negative