Why are there tiers for the residential stormwater utility fees?

Having several tiers allows the city to bill properties based on how much runoff they contribute to the storm drain system. This is fairer than charging all properties the same amount no matter how much (or how little) demand they place on the stormwater drainage system. 

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1. Why is impervious area used to determine a property's stormwater utility fee?
2. What is considered an impervious surface?
3. How is the amount of impervious area on my property calculated?
4. What if I disagree with the amount of impervious area listed on my bill?
5. Why are there tiers for the residential stormwater utility fees?
6. What are the tiers?