LEED AP Building Design and Construction (BD+C) Practice Exam

When managing runoff, what must be done regarding changes in land cover?

1. Increase the area of impermeable surfaces.

2. No changes are necessary.

3. Manage the increase in runoff volume from natural cover.

4. Only manage runoff during storm events.

The correct answer is: Manage the increase in runoff volume from natural cover.

The focus on managing the increase in runoff volume from natural cover is crucial because changes in land cover—such as urbanization or deforestation—often lead to alterations in the natural hydrology of a site. When natural surfaces, which typically absorb water, are replaced with impervious surfaces like asphalt or concrete, the volume and speed of runoff can significantly increase. This heightened runoff can overwhelm existing drainage systems, lead to erosion, degrade water quality, and result in flooding. By managing the increase in runoff volume, strategies can be implemented to mitigate these impacts, such as using green infrastructure practices like bioswales, rain gardens, or permeable pavements that help in capturing and treating stormwater on-site. This approach not only addresses immediate runoff issues but also contributes to long-term sustainability by enhancing the site’s resilience to storm events and protecting natural waterways. The necessity of actively managing runoff volume underscores the role that effective stormwater management plays in sustainable construction and land development, conforming to LEED principles that prioritize environmental stewardship and resource conservation.