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# Capacities 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.

### Sewage Pipe Capacity - SI Units - liter per second

Note! - the charts are based on clean plastic pipes - calculated with the Manning formularoughness coefficient 0.015 and fill 50%.

### Example - Capacity of a Sewer Pipe

The capacity of a 4 inch sewer pipe with decline 0.5% is aprox. 25 gpm (1.6 liter/s).

• 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

### Decline and Slope

Calculate between different units for decline and slope

d = 8.33 s(in/ft)

= 100 s(ft/ft)

= 100 s(m/m)

= s(ft/100ft)                                                    (1)

where

d = decline (%)

s = slope

#### Example - % Decline

1/8 in/ft slope can be transformed to % decline as

d = 8.33 (1/8 in/ft)

= 1.04 %

## 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 service systems - design properties, capacities, sizing and more

## Tag Search

• en: sewer, capacity, pipe, carrying
• de: Kanalisation, Kapazität, Leitung, Durchführung

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## Citation

• Engineering ToolBox, (2003). Capacities of Sewer Pipes. [online] Available at: https://www.engineeringtoolbox.com/sewer-pipes-capacity-d_478.html [Accessed Day Mo. Year].

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