A sewer ejector sump discharging at 20 gpm is equal to how many DFUs?

To determine the number of Drainage Fixture Units (DFUs) associated with a sewer ejector sump discharging at 20 gallons per minute (gpm), it's essential to understand how DFUs are assigned to various plumbing fixtures and systems.

A sewer ejector sump is typically used in residential applications to pump wastewater from a lower level to a higher level, allowing it to reach the main sewer line. The capacity of this system is measured in terms of flow rate, such as gallons per minute, which indicates how much water is being moved.

In plumbing code, one DFU is generally considered equivalent to 1 gpm for continuous flow purposes. Therefore, if a sewer ejector sump discharges at 20 gpm, this means it is effectively handling the equivalent load of 20 DFUs. This helps in sizing the plumbing system to ensure it can manage the expected waste flow without overloading.

Thus, a discharge rate of 20 gpm correlates directly to 20 DFUs, which aligns with the interpretation of how these units are calculated based on the flow characteristics of the ejector system.