How should the perforations in collection lines be oriented?

The correct orientation for the perforations in collection lines is downward. This design allows for optimal drainage and ensures that any liquid waste enters the collection system effectively. By placing the perforations facing downward, the gravity helps facilitate the flow of effluent into the surrounding soil, promoting adequate filtration and absorption. This positioning also helps prevent the accumulation of solids within the collection line, which could lead to clogs and system failures.

Orientation choices like facing upward or sideways can hinder the natural flow of liquid and lead to inefficient operation of the septic system. An upward-facing orientation, for instance, could cause accumulation of waste and solids at the perforations, while a sideways orientation would not align with the typical gravitational flow necessary for effective waste management.