Frequently Asked Questions
What is an impervious surface? Impervious surface is any hard surface that will not allow rainwater to soak through into the ground. Examples are roof top, sidewalks, driveways (concrete or asphalt). Rainwater runs off impervious surfaces until it reaches a surface such as grass or dirt where it begins to soak in.
How do you determine how much impervious surface is on my property?
Measure all sidewalks, driveway, parking area, rooftop or any other hard surface that will not allow water to soak through to the ground. Adding all these surfaces together forms a total square footage of impervious surface.