Drains and Sewers - Capacities vs. Size
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.
Related Topics
• Sanitary Drainage Systems
The purpose of the sanitary drainage system is to remove effluent discharged from plumbing fixtures and other equipment.
Related Documents
Cast Iron Soil Pipes - Dimensions
Dimensions of cast iron soil pipes.
Cleanouts in Draining Systems
Cleanouts provides access to the sewer for rodding.
DFU - Drainage Fixture Units
DFU are used to calculate the drainage flow from fixtures and the required capacities of sewer service systems.
Drain Pipes and Vent Stacks
Drain pipes and vent stack sizing.
Draining Systems - Main Vents
Vents in draining systems protects traps against pressure differences that could cause them to siphon or blow out .
Fixtures Trap Sizes
Recommended drain trap sizes for different types of fixtures
Horizontal Drainage Pipe - Required Slopes
Minimum pitch of horizontal drainage pipes.
Sanitary Drainage Systems - Volume Flow
Calculate expected volume flow load in sanitary drainage systems.
Sanitary Piping - Drainage Fixtures Unit Loads
Maximum Drainage Fixture Unit - DFU - loads in sanitary piping systems.
Septic Systems
Septic systems handles waste from drain systems.
Sewer Pipes - Capacities vs. Slope
Carrying capacities of sewer and wastewater pipes - gpm and liter per second.
Trap Sizes vs. Fixture Units
No. of fixture units and required trap size.
Water Supply Fixture Units - WSFU vs. GPM and Liters/sec
Converting WSFU - Water Supply Fixture Units - to GPM.
Water Supply Fixture Units WSFU
WSFU is used to calculate water supply service systems.