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Jonathan Lahive

18/02/2015 18:27:53

I am trying to model 2 parallel culverts, 12.5m long and 0.6m in diameter, with one pipe having a different slope to the other. What is the best way to model this? Is it possible to model 2 culverts in parallel? If so how would you go about doing it?

Thanks in advance.

Lei Yang

19/02/2015 08:53:41

Best answer

You can model the culverts by inserting junction unit at their upstream and downsteam ends. This method works well to represent culverts in parallel. Good luck with your modelling.

Jonathan Lahive

19/02/2015 10:35:56

Thanks, do you mean use one junction unit to connect the two culverts or should I use two junction units i.e. one junction unit for each culvert? Is it possible to show a screenshot of the model at this location?

davidforde

19/02/2015 11:14:01

Hey Jonny!

This is all you have to do:

Read from left to right: RIVER XS-RIVER XS - JUNCTION - CULVERT INLET - CONDUIT - CONDUIT - CULVERT OUTLET - JUNCTION - RIVER XS - RIVER XS

Instead of just one culvert branch, as shown above, you will have two separate branches connecting to the same junctions. Label each A or B; or something similar so you can tell them apart.

Be careful with initial conditions. Also, connect an 'overtopping spill' to each junction if there is risk of structure overtopping at high flows.

Hope this helps.

Jonathan Lahive

19/02/2015 11:48:52

Hey Dave,

Yeah that seems to have done the trick.

Cheers for that!

Mike.A.Snikta

15/01/2016 09:44:56

Hi David,

I hae just come across this post and have a question. For dual dulverts sharing the same headwall, is it necessary to have 2 culvert inlet units?  If i didnt want to model the losses caused by the headwall twice, is it possible to have the following arrangement?

RIVER XS-RIVER XS -CULVERT INLET  - JUNCTION -  CONDUITaU/S - CONDUITbU/S - CONDUITaD/S - CONDUITbD/S - JUNCTION - CULVERT OUTLET  - RIVER XS - RIVER XS.

 

Thanks,

 

Mike.

 

davidforde

15/01/2016 10:42:31

Hi Mike,

 

I've never tried that but I think it is not possible to do that. The culvert inlet unit needs to be connected to a conduit or river XS immediately downstream. I don't think having a junction instead will work; as you need at least 2 river/conduit sections upstream of a junction. In previous work I have usually just included 2 culvert inlets and checked the model results to ensure the losses aren't unreasonable. You could do a hand calc using the CIRIA C689 design guide to verify your results if the inlet isn't too complicated. The CULVERT INLET is based on this guide.

I hope this helps.

David

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