Capacity of Sewer Pipes

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The diagrams below can be used for design of sewage and wastewater gravity conveying systems where capacities in GPM or liter per second and the slopes of the pipe lines are known.

Sewage Pipe Capacity - Imperial units - gpm

Sewage Pipe Capacity - SI Units - liter per second

The table below indicates sewage pipe capacity in gpm:

The discharge rate is based on clean water and half filled pipes.

• 1 gal (US)/min = 6.30888x10^-5 m³/s = 0.227 m³/h = 0.06309 dm³(liter)/s = 2.228x10^-3 ft³/s = 0.1337 ft³/min = 0.8327 Imperial gal (UK)/min

Example - Capacity of Sewer Pipe

The capacity of a 4 inches sewer pipe with decline 12 ft per 100 ft pipe can be indicated from the table above to 93 gpm.

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