Sewer Pipes - Capacities vs. Slope

Carrying capacities of sewer and wastewater pipes - gpm and liter per second.

Sewage Pipe Capacity - Imperial units - gpm

Download Sewer Pipe Capacity as pdf-file

Sewage Pipe Capacity - SI Units - liter per second

Download Sewer Pipe Capacity as pdf-file

Note! - the charts are based on clean plastic pipes - calculated with the Manning formula, roughness 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 decline and slope units

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 %

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Sewer Pipes - Capacities vs. Slope

Carrying capacities of sewer and wastewater pipes - gpm and liter per second.

Sewage Pipe Capacity - Imperial units - gpm

Sewage Pipe Capacity - SI Units - liter per second

Example - Capacity of a Sewer Pipe

Decline and Slope

Example - % Decline

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