What does the term "horizontal run" refer to in plumbing?

The term "horizontal run" in plumbing refers to a section of pipe that is installed level, meaning it is positioned parallel to the ground. This is critical for various plumbing applications, especially in drainage systems, where maintaining a slope is important to ensure proper flow and prevent blockages. In a horizontal run, the pipe must be level to allow waste to move efficiently through the system without pooling or creating backups.

Understanding the significance of horizontal runs is essential for plumbers, as it directly impacts the efficiency of water flow and drainage systems. When pipe sections are improperly installed at angles or slopes that are not suitable, it can lead to complications such as leaks, clogs, or even the failure of the entire plumbing system over time. Thus, ensuring that a horizontal run is truly level is essential for proper plumbing function and maintenance.