What is a requirement for adjacent trenches in serial distribution systems?

In a serial distribution system for septic systems, managing the flow of excess liquid is vital for maintaining proper function and preventing issues like system overload or failure. A relief line plays a crucial role in this context as it allows for excess effluent to be redirected effectively, ensuring that the system does not become overwhelmed. Proper installation and management of a relief line can help maintain the water balance within the soil and prevent saturation that could lead to environmental contamination or system malfunctions.

The requirement for a relief line addresses the potential need to manage excess liquid that may accumulate in adjacent trenches due to various factors like heavy rainfall or if the system is being heavily used. This helps maintain the efficiency and longevity of the septic system while adhering to health and environmental standards.