What is the maximum recommended distance between manholes in a sewer system?

The maximum recommended distance between manholes in a sewer system is 400 feet. This distance is generally established to ensure effective maintenance and access for cleaning and inspections. Manholes provide access points to the sewer line, allowing for easier and more efficient removal of blockages, necessitating that they are not too far apart.

If the spacing were greater than 400 feet, the difficulty of maintenance could increase significantly, potentially leading to more significant issues within the sewer system. The standard of 400 feet strikes a balance, ensuring that plumbing professionals can perform necessary work without overly taxing resources or time. Furthermore, it enhances the system's overall reliability and functionality.