I have 2 questions. I am aware that the headloss is the same in all intakes into a water container.

My question is, is this illustration correct that the flow is different for different outlets? enter image description here

And when you calculate the headloss for this system, how do you go to calculate the splits? As 1 pipe which has the surface of the 2 pipes or is there something I'm missing?


1 Answer 1


Diagram A is correct.

There are several piping head loss methods, but a very common one is to apply equivalent feet for Tees and elbows. Here's one example You would then change the length of the pipes to make them all equivalently equal.

  • $\begingroup$ how do the parapel pipes fit into the equation :D $\endgroup$
    – Sangoku
    Feb 5, 2021 at 7:30
  • 1
    $\begingroup$ @Sangoku all the pipes need to have the same equivalent length $\endgroup$
    – Tiger Guy
    Feb 5, 2021 at 13:46
  • $\begingroup$ this ignores the pressure at the pipe ends - one is far lower, that will have an effect. equivalent lengths ignores different flowrates in the different pipe segments. $\endgroup$
    – mart
    Mar 9, 2021 at 10:16
  • $\begingroup$ @mart, yes, if there are height differences. The lack of h on the diagram indicates to me a plan view. $\endgroup$
    – Tiger Guy
    Mar 12, 2021 at 16:55

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