Final answer:
1) Manhole. When vertical drainage lines connect with horizontal drainage lines, they typically enter through a manhole.
Step-by-step explanation:
The correct answer is option 1) Manhole.
When vertical drainage lines connect with horizontal drainage lines, they typically enter through a manhole. A manhole is a large opening in the ground that provides access to an underground sewer system. It allows for maintenance, inspection, and cleaning of the drainage lines.
The correct answer is option 1) Manhole. In plumbing and sewage system design, vertical drainage lines need to connect with horizontal drainage lines in a way that allows access for maintenance, inspection, and clearing of blockages. The point of connection is typically made through a manhole.
Manholes are critical components in municipal sewage systems, as they allow utility workers to access the underground network of pipes.
Examples of historic sewage systems, such as the famed Cloaca Maxima in ancient Rome, utilized large channels which could be considered early forms of manholes due to their functionality. Modern sewer systems are similarly complex and rely on manholes to ensure everything functions properly.