what is sewerage system?
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A sanitary sewer or foul sewer is an underground carriage system specifically for transporting sewage from houses and commercial buildings through pipes to treatment facilities or disposal.
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Ans-Sewage contains various contaminants including disease-causing bacteria and other
microbes. ... If this contaminated water is used for drinking, then it can cause diseases such as
cholera, typhoid, dysentery, etc. which may lead to death. That is why it is harmful to discharge
untreated sewage into rivers or seas.
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