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RE: SewerGEMS Manhole Headlosses

Ref: communities.bentley.com/.../24540

More than 5 years have been passed, but it appears that SewerGEMS still ignores the headloss coefficient calculation for pits.
I'm using SewerGEMS SS4 08.11.04.54. Is there any newer version that can do this calculation?

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  • Hello,

    Could you offer some clarification on what you mean by a "pit"? Is this a manhole or a catch basin?

    It might be helpful to see a copy of a model where this is occurring. Adjustments to the calculation options may provide the headlosses you are looking for, but seeing the setup of a sample model would be useful in such a case.

    There are two options for sharing your model files on Communities. If you would like the files to be visible to other members, compress the files into a zip file and upload them as an attachment using the ‘Advanced Reply editor’ before posting. If your data is confidential, you can follow the instructions in the link below to send it to us via Bentley Sharefile. Files uploaded to Sharefile can only be viewed by Bentley.

    communities.bentley.com/.../7079.be-communities-secure-file-upload

    If you upload the file to Sharefile, please post here with the name of the file so we know that it is available.

    Regards,
    Scott
  • Hi Scott,

    Thanks for your reply. Actually a pit is a catch basin, I mean.

    I was wrong in my previous post saying SewerGEMS ignores headloss coef. calculation. Yes, the software now DOES headloss coefficient calculations, but unfortunately, in the example as attached, it appears that the software does not calculate the headloss (or provides a wrong water surface level in catch basin).

    Given the pipe is full flowing, the water surface level in the catch basin would be at least = 30.119+0.3+2.01*2.57*2.57/(2*9.807) = 31.096m assumed the energy slope is equal to the pipe slope, not 30.490 as calculated by the software as shown in attached screenshot.

    Phuong

    SewerGEMS Headloss.zip

  • Hello,

    We are looking into the the assumptions that SewerGEMS is using for modeling a case like this. I will let you know when we have some additional information for you on this issue.

    Regards,
    Scott
  • Hi Scott,

    Thanks for your reply. I'm sorry for making you guys confused by my WRONG confirmation on my earlier post that the software can do headloss coefficient calculation. Actually I put that coefficient of 2.01 into the model manually, and the software still saved that coefficient and plot it, even when I switched the headloss method to HEC-22.

    In fact, it did not calculate that coeff. at all.

    Not sure if any of you guys there is lucky of getting the software does that calculation.

    Regards,
    Phuong
  • Hello Phuong,

    Yes, the coefficient in the screenshot, "Headloss Coefficient (Downstream)" is actually related to the Generic headloss method and not used by the HEC-22 method. The developers are currently looking into the HEC-22 calculations. We will let you know as soon as we have some information on the issue.

    Regards,
    Scott
Reply
  • Hello Phuong,

    Yes, the coefficient in the screenshot, "Headloss Coefficient (Downstream)" is actually related to the Generic headloss method and not used by the HEC-22 method. The developers are currently looking into the HEC-22 calculations. We will let you know as soon as we have some information on the issue.

    Regards,
    Scott
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