Who else classifies gravel as impervious?
The City is following a nationally accepted standard by classifying gravel as impervious. In Virginia, the Department of Environment Quality publishes the "Virginia Stormwater Management Handbook," which defines impervious as, "a surface composed of any material that significantly impedes or prevents natural infiltration of water into soil. Impervious surfaces include, but are not limited to, roofs, buildings, streets, parking areas, and any concrete, asphalt, or compacted gravel surface."

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1. Why are gravel driveways considered impervious?
2. Who else classifies gravel as impervious?
3. I poured water on my driveway and it disappeared. Is it really impervious?
4. Can I get credit for my gravel driveway?
5. Are there permeable driveway surfaces?