Generally, a sewerage system means a network of mains and branches of underground conduits for the conveyance of sewerage to the point of disposal.
Sewers that carry only household and industrial wastage are called separate sewers; those that carry storm water from roofs, streets and other surfaces are known as storm water drains, while those carrying both sewage and storm water are called combined sewers.
In some towns where there is no sewerage system, it is served by open surface drain, box drain, sylk pattern drain, etc., in these towns.
Sewage disposal:
The best method of disposing sewage is through water carriage system.
In big cities, this system leads to the sewer systems and in small towns it may lead to septic tank.
Dilution:
It is a method in which the sewage is disposed into water sources such as rivers, streams and sea, after having been suitably treated.
The solid part obtained from this treated sewage is used as manure in fields.
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