Why are gravel driveways considered impervious?
Gravel driveways are considered impervious because they prevent infiltration, which results in stormwater flowing off these surfaces at a higher rate than pervious surfaces. This is typically due to compaction of the underlying soil and stones by vehicles.

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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?