Texas Wastewater Class B Practice Exam

Where is a sewer manhole typically located?

1. At the treatment plant

2. At changes in alignment, diameter, grade, direction and intersection

3. Only at the starting point of a sewer line

4. At the neighborhood entrance

The correct answer is: At changes in alignment, diameter, grade, direction and intersection

A sewer manhole is typically located at changes in alignment, diameter, grade, direction, and intersection to provide access for maintenance and inspection. These locations are critical because they allow sewer system operators to easily access sections of the sewer line for cleaning, repairs, and monitoring. Having manholes at these points helps in managing the flow of sewage, allowing for efficient adjustments when there are alterations in the pathways that sewage takes. For example, if a sewer line curves, changes size, or meets another line, the manhole serves as an access point to address potential blockages or structural issues effectively. In contrast, while treatment plants and neighborhood entrances may have manholes for different purposes, they are not necessarily the places that align with the primary function of facilitating access during operational adjustments to the sewer system. Having a manhole only at the starting point of a sewer line is limiting because it would not provide adequate access to inspect or maintain the sewer line along its entire length.