Issue with Hydraflow

Issue with Hydraflow

pmhereS5MEY
Contributor Contributor
158 Views
5 Replies
Message 1 of 6

Issue with Hydraflow

pmhereS5MEY
Contributor
Contributor

Experiencing an issue with Autodesk Hydraflow, a drainage analysis tool within Civil 3D. Specifically, when running a storm sewer network analysis, one of the pipe segments (line 38) generates a hydraulic grade line (HGL) that starts at an incorrect elevation 

 

File attached

 

 

0 Likes
Accepted solutions (1)
159 Views
5 Replies
Replies (5)
Message 2 of 6

fcernst
Mentor
Mentor

I don't see a file attached.



Fred Ernst, PE
C3D 2026
Ernst Engineering
www.ernstengineering.com
0 Likes
Message 3 of 6

pmhereS5MEY
Contributor
Contributor

attached zip

0 Likes
Message 4 of 6

fcernst
Mentor
Mentor
Accepted solution

Your Outfall stage elevation is 629.21.. so that's what it is using.

 

fcernst_2-1749831441755.png

 

 

fcernst_1-1749831387186.png

 

 

fcernst_0-1749831344924.png

 

 

 



Fred Ernst, PE
C3D 2026
Ernst Engineering
www.ernstengineering.com
0 Likes
Message 5 of 6

pmhereS5MEY
Contributor
Contributor

Fred

Thanks for the help. Can you say where it's getting that? I've tried to go in when I run it that the starting HDLI try to reset that it is setting the 629.21 and I don't understand why it's setting it there when the invert of that line is at 603. Could you tell me why that's happening?

0 Likes
Message 6 of 6

fcernst
Mentor
Mentor

The User sets that at run time, like I did here: 

 

fcernst_0-1750110677795.pngfcernst_1-1750110719431.png

 



Fred Ernst, PE
C3D 2026
Ernst Engineering
www.ernstengineering.com
0 Likes