When is it not necessary to loop the ends of a gravel distribution system?

In a gravel distribution system for septic installations, looping the ends of the system is designed to ensure equal distribution of effluent throughout the gravel medium. When using serial distribution, which is characterized by connecting multiple pipes in a sequence rather than providing a parallel layout, the flow of effluent is directed through each section in turn. In such a configuration, the primary concern is to ensure that each section receives its share of effluent. As a result, there is no requirement for looping the ends, since the system's design inherently promotes distribution through a linear pathway without necessitating additional looping for equalization.

In contrast, single pipe systems typically would require looping to manage flow balance effectively, while durable materials and the depth of installation generally pertain to considerations of system integrity and performance but do not directly influence the need to loop in a serial distribution setup. Therefore, the unique characteristics of serial distribution explain why looping the ends may not be necessary in this scenario.