Question

Which of the following is true about impervious building materials?
a.
Impervious surfaces prevent pollutants from entering the water supply.
b.
Vegetation and gravel are common impervious materials.
c.
Having fewer impervious surfaces improves water drainage.
d.
All of the above

Answer 1

c. Having fewer impervious surfaces improves water drainage.

Explanation: Impervious surfaces (e.g., asphalt, concrete, rooftops) prevent water infiltration, increasing runoff and transporting pollutants into waterways (so statement a is false). Vegetation and gravel are generally pervious (they allow infiltration), so b is false. Reducing impervious surface area does improve infiltration and drainage.