Why does the Water Department flush water mains?

The Water Department flushes water mains to remove sediments from the mains. This helps maintain the pipes and keep them clean. It is reccomended that residents run cold water, preferably through a garden hose, for a few minutes after flushing has occurred to prevent any loose sediment from entering your internal plumbing. 

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1. What should I do if I see water coming up in the street or in my yard?
2. What should I do if I have discolored water?
3. Why does the Water Department flush water mains?
4. Who should I contact with questions regarding my water bill?