What is an impervious surface?

Impervious surface means those disturbed or hard-surfaced areas that either prevent or restrict the natural entry of water into the soil. Rooftops, buildings, streets, parking lots, sidewalks, asphalt, concrete, other paving, driveways, gravel, patios, artificial turf, and storage areas are all examples of impervious surfaces. Impervious areas affect natural infiltration, creates more runoff, increases the rate of runoff, and alters runoff patterns of stormwater that drains from an area.

Show All Answers

1. Are sewers and storm drains the same thing?
2. What do I do if I observe someone dumping trash and other pollutants into storm drains?
3. What is a Catch Basin?
4. What is a Rain Garden?
5. What is an impervious surface?
6. What is stormwater and why is it a problem?
7. What is surface runoff?
8. What kinds of pollutants are found in the storm drain system?
9. What watershed am I in?