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Edited by Moosa2, 26 October 2025 - 01:37 AM.

[breizh]

Hi,

Did you try your favorite search engine ?

To start with :

 Hagen–Poiseuille equation - Wikipedia

https://en.wikipedia...igation systems.

https://en.wikipedia...isbach_equation

 

All equations are related to head losses. 

Hagen-Poiseuille is specific to laminar flow 

Hazen-Williams is used for water pipe networks ( empirical correlation) , examples : water distribution networks or fire fighting networks 

Darcy-Weisbach is the reference equation for liquids in pipes.

 

Good luck

Breizh