What does "Impervious Surface Area" mean?

As described in the Lewiston User Fee Study, Impervious Surface Area (ISA) means the total square footage of material on a property that resists or blocks the passage of water into soils as would occur under natural conditions. Examples of impervious surfaces include, but are not limited to, rooftops, roads, alleys, parking lots, sidewalks, patios, decks, graveled areas, and swimming pools. 

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1. What is the Stormwater Drainage System Services user fee?
2. How does this Stormwater Drainage System Utility benefit me?
3. Why is the City proposing a Stormwater Drainage System Services user fee now?
4. What will the Stormwater Drainage System Services user fee be used for?
5. What is a "Service Area"?
6. When would I start getting billed for this Stormwater Drainage System Services user fee?
7. What does "Impervious Surface Area" mean?
8. What does "Equivalent Residential Unit" mean?
9. Why can’t we wait to collect these user fees?
10. How is the Stormwater Drainage System Services user fee billed?
11. Is the sidewalk along my property included in the calculation of my user fee?
12. Is the Stormwater Drainage System Services user fee included in the Utility Assistance Program?
13. What happens if I don’t pay this user fee?
14. Why would I pay this user fee if all of my stormwater stays on my property?
15. Would the City be charged this user fee too?
16. What do I do when a storm water grate is plugged and causing water build up?
17. When it storms, the stormwater causes a big puddle by my driveway or washes the gravel from the end of my driveway. What do I do?