3 Pipes flowing into manhole

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Brett Robinson
Posts: 5
Joined: Tue Oct 15, 2019 12:22 pm

3 Pipes flowing into manhole

Post by Brett Robinson » Thu Nov 14, 2019 11:29 am

Good morning all,

I'm trying to model in (12d Version 11) three pipes going into one manhole and when trying to run a storm analysis I'm getting an error mentioning that it isn't a unique pit name for that particular manhole.

The two pits in the error message (both the same name) mentioned have the exact same x and y and pit type. When I try to change the name of one of the 'manholes' stacked onto each other the other man hole changes with it.

Not sure how to proceed, does anyone have another idea I could try?

Cheers,
Brett

Owen Thornton
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Joined: Tue Oct 04, 2005 12:50 pm
Location: Brisbane
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Post by Owen Thornton » Thu Nov 14, 2019 11:45 am

V11 is getting a bit long in the tooth ... assuming you have a license under maintenance, please send a 12daz of the drainage model to "support at 12d dot com" and we'll have a look. Please also mention the pit name.

I suspect there is a string or flow direction mismatch, but can't be sure without seeing it.

Owen Thornton
Posts: 4891
Joined: Tue Oct 04, 2005 12:50 pm
Location: Brisbane
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Post by Owen Thornton » Thu Nov 14, 2019 1:25 pm

Brett, I think I have found the issue. I have emailed you a reply.

Cheers,
Owen.

Victor Wong
Posts: 3
Joined: Mon Oct 17, 2016 1:20 pm

Re: 3 Pipes flowing into manhole

Post by Victor Wong » Sun Jun 07, 2020 5:30 pm

Hi Owen

I have the same issue where I have a junction pit with 1 inlet pipe and 2 outlet pipes. I can't run the drainage analysis. The error 'non-unique pit name' keeps coming up. What is the solution here?

Thanks
Victor

Owen Thornton
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Joined: Tue Oct 04, 2005 12:50 pm
Location: Brisbane
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Re: 3 Pipes flowing into manhole

Post by Owen Thornton » Mon Jun 08, 2020 1:07 pm

Hi Victor, that would be a different issue (diverging/bifurcating pipe flows). A solution is described in this other topic:

viewtopic.php?f=3&t=11673

(Note that you don't need to do this with the dynamic analysis, where the hydraulics are automatically balanced.)

Victor Wong
Posts: 3
Joined: Mon Oct 17, 2016 1:20 pm

Re: 3 Pipes flowing into manhole

Post by Victor Wong » Mon Jun 08, 2020 8:40 pm

Thanks Owen. Great info.
Victor

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