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Question: What is the difference between foul and surface water sewers and combined sewers?
Answer: Foul sewers carry used water from properties. Surface water sewers carries storm water away from a property. Where separate such separate sewerage networks are in place serving an area then the appropriate sewer should be utilised when making new connections to the network. However occasionally surface water can drain into a foul sewer where no other method of removal is available but this should only be a last resort because of the risk of foul water flooding. Used water should never be diverted into a surface water sewer because of the risk of pollution of a stream or aquifer. It is not uncommon in older developments to see combined sewers which are designed to carry both foul and surface water to an appropriate treatment facility.

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