What is the function of a manhole in a collection system?

The function of a manhole in a collection system is primarily to provide access for maintenance and inspection. Manholes are strategically placed along sewer lines to create entry points that allow workers to inspect the integrity of the system, perform routine maintenance, and address any blockages or issues that may arise. This accessibility is crucial because it enables effective monitoring and management of the collection system without the need for extensive excavation or disruption.

While some manholes can play roles in monitoring and separating pipeline sections, their primary purpose remains ensuring ease of access. It's essential for system operators to be able to evaluate the physical condition of the collection system regularly, and manholes facilitate this important task. Thus, option B correctly identifies the fundamental role manholes play in maintaining the efficiency and safety of wastewater collection systems.