Which factor is NOT considered when determining the slope of a gravity sewer line?

When determining the slope of a gravity sewer line, several factors play a crucial role to ensure effective flow and prevent issues such as blockages or insufficient drainage. Among those factors, the type of material used, the size of the pipe, and the expected flow rate are essential considerations.

The type of material can affect the frictional resistance and durability of the pipe, influencing how easily wastewater can flow through. The size of the pipe is vital because larger pipes can accommodate more flow, reducing the risk of backups and ensuring that the slope is appropriate for the volume of wastewater expected. The expected flow rate directly relates to how the sewer line needs to be configured; a higher flow rate may necessitate a steeper slope to maintain adequate movement of wastewater.

The diameter of the inlet pipe, while important for determining how much waste can initially enter the system, does not directly impact the calculation of the slope for the rest of the sewer line. Instead, the slope is primarily derived from the factors that ensure continuous and efficient flow throughout the entire system, rather than just at the point of entry. Therefore, the diameter of the inlet pipe is not considered when determining the slope of a gravity sewer line.