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Outlet to a Pond Flows

RKJ
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I have a model I have been working on which contains a detention pond with multiple areas contributing flows into it. We are developing a site adjacent which has underground stormwater piping which outlets into the pond. In my model I have an outfall element linked to the pond using the boundary element boundary condition. This allows all backwater effects to be taken into account as pond levels exceed our outlet elevation. I also have 2 catchments which drain directly to the pond overland, so they are connected directly with the pond as an outflow element.

The problem I am having is that the outfall which is only supposed to carry flows from the underground piping is showing a much larger flow than the flow in the conduit. It doesn't make sense since there are no other elements connected to it. Does anyone know how I can fix this problem? I need to demonstrate our developments impact on the existing pond in order to utilize its capacity. I have attached a screenshot of the outfall, conduit, and their associated graph with flows.

  • 0 Offline

    Hello,

    Could you also provide the model so we can look into this? There are two options for sharing your model files on BE 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/.../bentleysecurefilesupload.aspx

    If you upload the model to Sharefile, please post here as well so that we know that it is available.

    Regards,

    Scott Kampa

    Bentley Technical Support

  • 0 Offline in reply to Scott Kampa

    Scott,

    I have uploaded the zip file with all of the model files to Sharefile and they are called Keller Site.

    Thanks,

    Ryan

  • 0 Offline in reply to RKJ
    Hello Ryan,

    Are the data inputted into the model correct? The profile "CB-1 to Pond" has a large drop in invert elevations. Plus the size of the conduits decreases downstream (the diameter of CO-INFIL is particularly small compared to the rest of the diameters). Some of this may be contributing to the issue, so knowing if the input in accurate will help with further troubleshooting.

    If you want to send a private message with the information, that will be fine. I can post the final solution to the forums again when the solution is identified.

    Regards,
    Scott
  • 0 Offline in reply to Scott Kampa
    Hello Ryan,

    I think I see what is happening in the model. This can actually be reproduced in a sample model too, but the scale of the impact on the results is more pronounced in your model because of the size of the catchment "STORAGE UNITS".

    What is happening is that all inflow into the pond is being reported at the outfall, instead of just the flow from the upstream conduit. If you graph the flow for the CO-OUTLET, O-OUTLET TO POND, K-6 and STORAGE UNITS on the same graph, you will see that the sum of flow for K-6, STORAGE UNITS, and CO-OUTLET is equal to the flow at O-OUTLET TO POND. The reference number for this 143155.

    This reporting issue has been send to the developers, and this will be resolved in a future release of SewerGEMS. For now, the flow on CO-OUTLET should be accurate.

    Please let me know if you have any questions.

    Regards,
    Scott

    Answer Verified By: RKJ 

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