Which of the following is true about impervious building materials?

Impervious materials, such as concrete and asphalt, do not let water soak into the ground. With fewer impervious surfaces, more rainwater can infiltrate the soil, improving drainage and reducing runoff. Vegetation and gravel are generally permeable, so choice b is false; impervious surfaces can also carry pollutants into waterways, making choice a false. The true statement is “Having fewer impervious surfaces improves water drainage.”

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