Storm Water Pollution Prevention Plan (SWPPP) Practice Test

Which erosion control best management practice increases water infiltration and reduces overland flow of stormwater?

1. Concrete barriers

2. Vegetation

3. Gravel paving

4. Riprap installation

The correct answer is: Vegetation

The choice of vegetation as the best management practice for erosion control is significant because it serves multiple functions in the context of stormwater management. Vegetation enhances water infiltration primarily through the root systems of plants, which create channels in the soil and improve soil structure. This allows more water to permeate the ground rather than flowing over the surface, which can lead to increased runoff and erosion. In addition to increasing infiltration, the presence of vegetation helps to slow down water movement across the ground, effectively reducing the velocity of overland flow. This dual effect of promoting infiltration while minimizing surface runoff plays a critical role in maintaining the health of watershed areas and mitigating the impacts of stormwater pollution. Moreover, vegetation acts as a natural barrier against soil erosion, holding the soil in place with roots and reducing the potential for sediment displacement during storm events. By embracing landscaping and plant cover, stormwater management systems are enhanced, leading to better environmental outcomes.