Sewer Collection Systems Operator Practice Test

What kind of sewer receives waste water from a relatively small area and discharges into a sub-main sewer?

Sub-main Main sewer Interceptor Branch sewer

Correct Answer:

Branch sewer

Explanation:

Branch sewers collect wastewater from a relatively small area, such as a few streets or a single block, and discharge into a sub-main. This setup is what allows local areas to feed into a larger conduit that carries the combined flow toward the main sewer. In the hierarchy, a sub-main then receives from several branches and feeds the main sewer, the main sewer collects from sub-mains and transports toward the treatment system, and an interceptor is the largest line that carries wastewater over long distances to treatment. Because the scenario specifies a line serving a small area that feeds into a sub-main, the branch sewer is the best fit.

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