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Many cities have combined sewers. In good weather, these systems funnel sewage to treatment plants. During rainstorms street runoff is combined with sewage. Combined sewers in cities can be problematic because

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Montse170
The sewers cannot handle the volume of waste from street runoff and sewage.
jdmvibes21
the sewers cannot handle the volume f waste from street runoff and sewage 
cheers mate !