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Hydraulic Grade Line below invert of pipe!

Hi,

We have a Storm Drainage network with Soakaways scattered along the ROW and all interconnected with overflow pipes. The overflow lines are achieved with a control structure in the pipe line. However, I have modelled the network but at certain locations, the HGL seems peculiar which is running below the pipe invert and in V shape. The overflow connection is same as any other upstream/Downstream overflow pipes(Refer to screenshots below) where HGLs are running normal. Appreciate if anyone can elaborate this unusual


behavior of HGL.

Parents
  • Hello Mohthesham,

    First, make sure that you the start and stop nodes for the conduits are correct, as mentioned in this link. Based on the symptoms, I am not sure this is part of the issue, but it is worth checking. 

    I assume that this is occurring at the initial time step. What happens if you move forward one time step in the profile? 

    Otherwise, please let us know what product and version you are using. In addition, it may be useful to see a copy of the model files.

    Regards,

    Scott

Reply
  • Hello Mohthesham,

    First, make sure that you the start and stop nodes for the conduits are correct, as mentioned in this link. Based on the symptoms, I am not sure this is part of the issue, but it is worth checking. 

    I assume that this is occurring at the initial time step. What happens if you move forward one time step in the profile? 

    Otherwise, please let us know what product and version you are using. In addition, it may be useful to see a copy of the model files.

    Regards,

    Scott

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