What is an impervious area?

An impervious area is defined as the surface within the parcel that does not allow soil infiltration to occur, and includes:

  • Driveways
  • Patios
  • Paved areas
  • Roofs
  • Sidewalks

Relationship Between Impervious Area & Runoff

There is a direct relationship between the amount of impervious area and the runoff generated by a parcel, therefore this area is a common basis for the establishment of a stormwater utility user fee.

Show All Answers

1. Why does the city need a stormwater fee?
2. What is an impervious area?
3. What is an SFU?
4. I think my fee is incorrect: what should I do?