How did the city determine impervious surface area?

For single family homes, a statistical sampling was taken using Geographical Information System (GIS) including aerial survey data. Each was measured and an average impervious surface area was determined. For businesses and other institutions, the city measured the impervious area using aerial survey data.

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1. What is stormwater runoff?
2. What problems does it cause?
3. Why are the storm water and sewer systems separate?
4. What is nonpoint source pollution?
5. What is impervious surface area?
6. How did the city determine impervious surface area?
7. What can I do to reduce pollution in stormwater runoff?