What distinguishes a “pervious surface” from an “impervious surface” in stormwater management?

• A. Pervious surfaces allow water to infiltrate, while impervious surfaces prevent infiltration
• B. Pervious surfaces are only found in urban areas
• C. Pervious surfaces are more expensive to maintain
• D. Pervious surfaces always require additional drainage systems

Answer: (A)

The distinction between pervious and impervious surfaces is fundamental in stormwater management. Pervious surfaces, such as grass, gravel, or porous pavement, allow water to infiltrate into the ground, promoting natural groundwater recharge and reducing surface runoff. This infiltration helps manage stormwater by filtering pollutants and decreasing the volume of water that flows into storm drains and waterways.

In contrast, impervious surfaces, such as concrete and asphalt, do not allow water to penetrate, resulting in increased runoff, which can lead to flooding, erosion, and water quality degradation. Understanding this difference is critical for implementing effective stormwater pollution prevention strategies.

Recognizing that pervious surfaces facilitate infiltration while impervious ones hinder it illustrates why the first choice is the correct one in this context. It highlights the role of different surfaces in managing stormwater impacts, which is a core principle in sustainable urban design and environmental protection measures.