Capacity of Sewer Pipes

Carrying capacity of sewer and wastewater pipes - gpm and liter per second

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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 wastewater pipe capacity gpm

Sewage Pipe Capacity - SI Units - liter per second

sewage wastewater pipe capacity liter per second

The table below indicates sewage pipe capacity in gpm:

Carrying Capacity of Sewer Pipe (gallons per minute)
Size of pipe (inches)	Decline per 100 ft pipe (feet)
Size of pipe (inches)	1	2	3	6	9	12	24	36
3	13	19	23	32	40	46	64	79
4	27	38	47	66	81	93	131	163
6	75	105	129	183	224	258	364	450
8	153	211	265	375	460	527	750	923
9	205	290	355	503	617	712	1006	1240
10	267	378	463	655	803	926	1310	1613
12	422	596	730	1033	1273	1468	2076	2554
15	740	1021	1282	1818	2224	2464	3617	4467
18	1168	1651	2022	1860	3508	4045	5704	7047
24	2396	3387	4155	5874	7202	8303	11744	14466
27	4407	6211	7674	10883	13257	15344	21770	26622
30	5906	8352	10223	14298	17717	20204	28129	35513
36	9700	13769	16816	23760	29284	33722	47523	58406

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

1 gal (US)/min = 6.30888x10^-5 m³/s = 0.0227 m³/h = 0.06309 dm³(liter)/s = 2.228x10^-3 ft³/s = 0.1337 ft³/min = 0.8327 Imperial gal (UK)/min

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