What is a branch interval?

A branch interval refers to a specific measurement in a drainage system, which is defined as the distance greater than 8 feet between branch connections. This concept is important in plumbing design to ensure proper drainage and venting within the system. Maintaining adequate space between connections helps to reduce the potential for clogs and ensures efficient flow throughout the drainage system.

The other concepts provided in the options relate to different components or configurations of plumbing systems. For example, while connections and vertical columns of pipes are essential elements, they do not address the specific measurement of distance that defines a branch interval. Understanding this terminology is crucial for designing effective drainage systems that meet standards and perform reliably.