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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

User Amal
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the sewers cannot handle the volume f waste from street runoff and sewage
cheers mate !

User Nazrul
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The sewers cannot handle the volume of waste from street runoff and sewage.
User Jules Copeland
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