In a pipeline, what is the term for the lowest point on the inside?

The term that refers to the lowest point on the inside of a pipeline is known as the invert. This is an important concept in the design and maintenance of drainage and sewage systems, as the invert provides crucial information about the flow dynamics within the pipeline.

The invert level is critical for ensuring that gravity can move waste or stormwater effectively through the system. It is typically measured from the top of the pipe to the lowest point inside, influencing how the fluid will flow based on gravity and pressure factors in the surrounding environment.

Other terms like outlet, drain, and channel refer to different components or concepts within a drainage system but do not specifically denote the lowest point inside a pipeline. An outlet refers to where the water exits, a drain is generally a structure for removing excess water, and a channel often describes a path for directing water rather than specifying internal pipeline geometry. Hence, understanding the term invert is essential for anyone involved in collection system maintenance.