When only one set of sewers is used to carry both sanitary sewage and stormwater, it is called a ________ system.

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Partial sewer

Direct sewer

Separate sewer

Combined sewer

answer is A.

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Detailed Solution

Combined sewer systems consist of only one sewer to carry out both stormwater and sanitary sewage.

A glance at other options

In a separate sewer system, the domestic and industrial wastes are carried out in one set of sewers whereas the Strom and surface are carried out in another set of sewers.
A partial sewer system is a modification of a separate sewer system. In this system, two sets of sewers are laid. A portion of stormwater is allowed to enter in the sewers carrying sewage and the remaining stormwater flows through a separate set of the sewer.
A direct sewer system does not exist.

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