What is the total fixture unit value of a 3" basement floor drain, including trap and branch?

The total fixture unit value of a 3" basement floor drain, including trap and branch, is generally assigned a value based on plumbing codes and standards. For a floor drain of this size, the appropriate designation is 3 fixture units (FU). Fixture units are a method of quantifying the load that a plumbing system must handle during peak demand, taking into account both the characteristics of the fixture and its connection to the drainage system.

The 3 fixture unit value corresponds to standard guidelines which consider factors such as flow rate, frequency of use, and potential simultaneous discharges from the drain. A basement floor drain is typically designed to handle wastewater from various sources in a basement area, and the 3 FU value reflects the average expected usage and capacity under normal conditions.

Other choices reflect higher values which are not typically assigned to a 3" floor drain; these might apply to multiple fixtures or larger systems but do not accurately represent the capacity of a singular 3" basement floor drain. Understanding how fixture units work aids plumbers in designing effective drainage systems that can adequately manage wastewater while adhering to relevant plumbing codes.