Drains and Sewers - Capacities vs. Size
Drainage Fixture Units (DFU) connected to building drains and sewers.
Note! - charts are based on clean pipes. Friction coefficients may vary with pipe material.
The Drainage Fixture Unit Values (DFU) are defined by the Uniform Plumbing Code (UPC) and can be used to determine required drainage capacities from fixtures and service systems.