Storm Water Pollution Prevention Plan (SWPPP) Practice Test

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What should be done to reduce the risk of undercutting?

  1. Plant more vegetation

  2. Use chemical stabilization methods

  3. Install filter fabric under BMPs and stormwater conveyance

  4. Increase the slope of the area

The correct answer is: Install filter fabric under BMPs and stormwater conveyance

Installing filter fabric under Best Management Practices (BMPs) and stormwater conveyance is an effective method for reducing the risk of undercutting. Filter fabric acts as a barrier that helps to stabilize the soil while allowing water to flow through, thus preventing the erosion that leads to undercutting. This approach is crucial in managing stormwater effectively and ensuring that structural integrity is maintained in areas prone to erosion. By preventing soil particles from being washed away, filter fabric supports the effectiveness of BMPs by ensuring they remain in position and function properly. This additional layer helps protect the underlying soil and enhances the longevity of the infrastructure designed to handle stormwater runoff. Other methods, such as planting more vegetation or using chemical stabilization, also play roles in preventing erosion and enhancing soil stability but may not directly address the specific issue of undercutting in the same targeted manner as filter fabric. Additionally, increasing the slope of an area could inadvertently increase the velocity of water runoff, amplifying the risk of erosion rather than mitigating it. Thus, installing filter fabric specifically targets the operational mechanics of undercutting prevention effectively.