What is the minimum fall requirement for a house sewer?

The minimum fall requirement for a house sewer is defined to ensure that wastewater flows effectively through the pipes. A fall of 1/8 inch per foot is crucial because it provides enough slope to maintain the momentum of the wastewater, preventing it from settling in the pipeline and reducing the risk of blockages or backups.

This specific measurement is a balance between having enough slope to facilitate drainage without being too steep, which could lead to the wastewater flowing too quickly and potentially causing problems such as splashing or insufficient scouring of the pipe walls. Hence, the standard of 1/8 inch per foot is established in plumbing codes and practices to ensure proper functioning of the sewer system and to meet health and safety regulations.

Other options listed do not meet the general requirements established in plumbing codes, as they either provide insufficient fall or suggest that no minimum is necessary, which would compromise the flow and functionality of the sewer system.