This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Link has adverse slope and flooding not reporting

1- In the model attached, the User Notifications says " CO-4 has adverse slope" however when I look to the profile does not show that, and the link properties does show the valuse = 1.526 mm/m?

2- the Profile from MH31 to LS-33 shows flooding, however; when I check Manholes (MH31 and MH32) properties " is Ever Overflowing? it shows False. 

would you please clarify?

Regards.......Mohamad

D1_LS_33 and 44.stswpkg.zip

  • Hi Mohamad,

    1) I can see what you are saying and I suspect it may be due to the negative elevations. Please allow us some time to investigate further. Thank you for your patience.

    2) I also see this, but the lack of overflow may be due to this. Again, we will investigate further and get back to you.


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows Products
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

  • 1) Upon closer inspection, it appears that the adverse slope warning is due to the downstream wetwell. When the conduit is configured to automatically set the invert to the stop node, it picks up on the wetwell base elevation (-3.41 m), but it appears that the warning message in question is incorrectly using the minimum elevation (-3.0 in your case), hence you get the adverse slope warning. I have reported this to our development team as Defect #1060214 . They will prioritize and investigate for a future release. In the meantime, you can either ignore the message, or set the wetwell minimum elevation to -3.41 m).

    2) I can confirm that the lack of overflow at MH31 and MH32 is because the numerical solver ignored overflow in favor of stability, because the overflow would be due to backwater effects from the downstream wetwell water level. If you change the LPI coefficient to 5.0 for example, you will start to see overflow (graph the HGL, rim elevation and overflow together to see), but the results are less stable and will require further tweaking of advanced calculation options per this article, if you want to account for overflow. See:

    Zero overflow at manhole despite HGL above rim.

    Troubleshooting unstable SewerGEMS and CivilStorm results using the Implicit solver


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows Products
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

    Answer Verified By: Mohamad Azzam