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usually when they plumb your sump pump in (depending on city regulations) they will plumb it directly into the city sewer.

It's a good problem you have because that means your ground water is going into your sump and not into other parts of your basement! In terms of what to do either extend the pipe to the city street or install some drain channel, that you can get grates for. A plumber may be able to plumb your discharge line directly into your sewer BUT you would have to check with him on local codes whether they allow this or not