Gravity pipe hydraulic calculations

Flow rate and speed calculations for sewer, rainwater and drainage systems (Colebrook White)

Select usage:
- Utility sewerage systems
- Rainwater sewerage systems
- Drainage systems: type UP
- Drainage systems: type MP 120°
- Drainage systems: type LP 180°
- Drainage systems: type LP 220°
- Drainage systems: type TP 360°
Select product:

Unfortunately, no products have been found in selected usage category.
Select parameters:

SN class (
kN/m²
) :
Calculate:

Nominal dimension, DN (
mm
) :

Filling height, H (
%
) :

Internal diameter (
mm
) :

Sole gradient, i :

Brīvās krišanas paātrinājums :

Operational roughness (
mm
) :

Caurplūdes attiecība :

Liquid temperature (
^oC
) :

Traverse wall stress (
N/m²
) :

Hidrauliskais rādiusa koef :

Plūsmas ātruma attiecība :

Minimālais ieteicamais plūsmas ātrums (
m/s
) :

Minimālais pildījuma augstums (
%
) :

Maksimālais pildījuma augstums (
%
) :

Ūdens blīvums (
kg/m³
) :

Kinemātiskā viskozitāte (
m²/s
) :

Incorrect values or formula

Recommended minimum sole gradient value¹

m/m

cm/m

%

mm/m

m/km

‰

¹If the selected sole gradient value is less than the recommended minimum, the calculation should be updated with this value to obtain a correct result to prevent sedimentation.

¹If the selected sole gradient value is less than the recommended minimum, the calculation should be updated with this value to obtain a correct result to prevent sedimentation.

¹If the selected sole gradient value is less than the recommended minimum, the calculation should be updated with this value to obtain a correct result to prevent sedimentation.

¹If the selected sole gradient value is less than the recommended minimum, the calculation should be updated with this value to obtain a correct result to prevent sedimentation.

¹If the selected sole gradient value is less than the recommended minimum, the calculation should be updated with this value to obtain a correct result to prevent sedimentation.

¹If the selected sole gradient value is less than the recommended minimum, the calculation should be updated with this value to obtain a correct result to prevent sedimentation.

Average flow rate²

m/s

²It is recommended to maintain the optimum flow rate in the range 0.7 - 4 m/s.

Throughflow

l/s

dm³/s

m³/h

m³/s

DN

mm

The calculations made and the results provided are informative. They may help you choose the appropriate solutions or products to be used if the user has an understanding of the specific calculation principles. The results of these tools and related information do not replace recommendations from a competent and professional specialist in the field and cannot be extended to products from other manufacturers. EVOPIPES reserves the right to restore and change the content of the information at any time without prior notice, as well as to make improvements and changes to the operation of calculators.

How to use calculator

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Gravity pipe hydraulic calculations

Select usage:

Utility sewerage systems

Rainwater sewerage systems

Drainage systems: type UP

Drainage systems: type MP 120°

Drainage systems: type LP 180°

Drainage systems: type LP 220°

Drainage systems: type TP 360°

Select product:

Select parameters:

Calculate:

Recommended minimum sole gradient value¹

Average flow rate²

Throughflow

DN

Additional project details:

How to use calculator

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