AutoCAD Civil 3D - Stormwater

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Contributor
kdave
Posts: 19
Registered: ‎09-13-2011
Message 1 of 8 (495 Views)

Multi-stage Riser

495 Views, 7 Replies
09-14-2011 07:30 AM

First of all, I want to say that this discussion group has been very helpful. Thanks to Matt who responds quickly and solves the problem which may take hours or days for someone like me who is new to the program. Thanks..!!

 

I am trying to model a multi-stage riser structure for a detention pond. I need to input 2 orifices and 1 weir which all drain to a barrel (primary outlet pipe of the pond). So I put in a barrel pipe as a culvert and connected it from the pond to an outfall. Now when I try to put orifices, I can not connect them to the culvert (barrel pipe). And if I try to connect the orifices directly to the outfall (thinking that the software will know that it is going through the barrel pipe), the program gives me an error saying that more than one inlets to an outfall is not acceptable. Any solutions as to how I can model this in SSA?

 

Thanks,

KD

Employee
Matt.Anderson
Posts: 2,906
Registered: ‎05-13-2005
Message 2 of 8 (490 Views)

Re: Multi-stage Riser

09-14-2011 07:48 AM in reply to: kdave

KD -

 

You will need to have your 2 orfices, and 1 wier connected to a Junction.  That junction then connects your outfall barrel to the outlet. 

 

 

Matthew Anderson, PE
Contributor
kdave
Posts: 19
Registered: ‎09-13-2011
Message 3 of 8 (484 Views)

Re: Multi-stage Riser

09-14-2011 08:14 AM in reply to: Matt.Anderson

Thanks.

 

One more question. I want to put in a Broad Crest Weir but I don't see that option in weir type. Any suggestions?

*Expert Elite*
wfberry
Posts: 1,747
Registered: ‎09-05-2006
Message 4 of 8 (463 Views)

Re: Multi-stage Riser

09-15-2011 11:37 AM in reply to: kdave

When you click on the down arrow next to Weir Type, Broad Crested is the very most top one.

 

Bill

 

 

Contributor
kdave
Posts: 19
Registered: ‎09-13-2011
Message 5 of 8 (461 Views)

Re: Multi-stage Riser

09-15-2011 11:45 AM in reply to: wfberry

Bill,

 

I don't see it for some reason. When I click on the down arrow on weir type, here is what I get,

 

ssa2.jpg

Contributor
kdave
Posts: 19
Registered: ‎09-13-2011
Message 6 of 8 (460 Views)

Re: Multi-stage Riser

09-15-2011 11:48 AM in reply to: kdave

Sorry the screen shot image didn't show up as good as I thought it would. I have attached the file with this message.

Product Support
Matt_Haokip
Posts: 99
Registered: ‎05-27-2011
Message 7 of 8 (447 Views)

Re: Multi-stage Riser

09-16-2011 10:49 AM in reply to: kdave

Hi kdave,

 

Although SSA does not list Broad Crested Weir in the dropdown list for the weir Types, you can account for Broad Crested Weir by defining the Physical Properties and Discharge Coefficient. The range for the Discharge Coeff. can be obtained by clicking on the ellipsis button next to Discharge Coeff.

 

Please see the attached image for reference.

 

Thanks.

If my post answers your question, please mark it as an Accepted Solution, so that others can find answers quickly!



Matt Haokip
Contributor
kdave
Posts: 19
Registered: ‎09-13-2011
Message 8 of 8 (443 Views)

Re: Multi-stage Riser

09-16-2011 11:27 AM in reply to: Matt_Haokip

Thanks a lot! That answers my question!

 

Thanks,

KD

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