How is my impervious area calculated?

The impervious area of a property is determined by using the following:

  • Aerial Photography
  • As-Built Drawings
  • Building Permits
  • Field Surveys
  • Final Approved Site Plans
  • Other Appropriate Engineering and Mapping Analysis Tools

Here is a commercial property fee example using aerial photography. The property is outlined below and the impervious area is shown in red hatching.

Impervious Area

Impervious Area Calculation

Show All Answers

1. How will my stormwater bill arrive?
2. My property is tax-exempt. Am I required to pay the stormwater utility fee?
3. What is an impervious area?
4. How is my impervious area calculated?
5. I think that the impervious area calculated for my property is incorrect? What should I do?
6. I own a commercial property and have made some improvements to my property that changed the impervious area (larger parking lot or building size). Will my stormwater utility fee change?
7. I believe that there may be an error to my fee. How do I make a request for an adjustment?
8. I live in a subdivision with stormwater BMPs and drainage infrastructure. Why do I have to pay the stormwater utility fee?
9. Who pays the stormwater utility fee?
10. What is the fee based on?
11. How much will I pay (fee rates)?
12. Can I petition for an adjustment of my stormwater fee?