Capacity of Sewer Pipes

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

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 of pipe (ft)
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 2860 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 = 0.227 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 (5.9 liter/s).

Related Topics

  • Fluid Flow and Pressure Drop - Pipe lines - fluid flow and pressure loss - water, sewer, steel pipes, pvc pipes, copper tubes and more
  • Water Systems - Hot and cold water systems - design properties, capacities, sizing and more

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