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Calculated value for Capacity Full- Flex table results

Hello,

I'm simulating a SW network in SewerGEMS. Pipe dia is 0.9 m slope 0.0004. But the capacity full is not showing correctly except in the first pipe.

May I know how to correct this or the reason for this? (I have allowed for full flow.  My capacity design is same as the Capacity full flow. Simulating the model in GVF- Rational solver)

BR

Nishadi

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  • Hello Nishadi,

    The full capacity does look correct for that first pipe. Can you confirm that the properties of the other pipes do indeed show the same diameter, slope and roughness? Did you attempt to execute constraint-based design?

    In the calculation summary (which appears after computing the model), check to make sure it shows "convergence achieved".

    Also, try going to File > Database Utilities > Synchronize Drawing, then re-compute the model.

    Lastly, check your software version, as seen under File > Help > About. The latest version is currently 10.03.04.53 - if you are not already using this version, upgrading is recommended in case a related issue has already been resolved.

    If this does not help, please provide a copy of the model for review: Sharing Hydraulic Model Files on the OpenFlows Forum


    Regards,

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

  • Thanks for the reply Jesse, I did the suggested steps. But didn't get the results. I have shared the model.

    Thanks and Regards

    Nishadi

  • Thanks for sending the model. Some of those pipes have a higher capacity because the number of barrels is set to 2. Add the column "Number of Barrels" to your conduit table and you will see that the "correct" pipe has one barrel and the others have two. Two barrels of 900mm pipe have twice the capacity of one. Two "barrels" means that the single conduit element represents two pipes with the same shape/diameter, roughness, slope and inverts, in parallel.

    See the following related article: Understanding the impact of multiple barrels for a conduit


    Regards,

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

    Answer Verified By: Nishadi 

Reply
  • Thanks for sending the model. Some of those pipes have a higher capacity because the number of barrels is set to 2. Add the column "Number of Barrels" to your conduit table and you will see that the "correct" pipe has one barrel and the others have two. Two barrels of 900mm pipe have twice the capacity of one. Two "barrels" means that the single conduit element represents two pipes with the same shape/diameter, roughness, slope and inverts, in parallel.

    See the following related article: Understanding the impact of multiple barrels for a conduit


    Regards,

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

    Answer Verified By: Nishadi 

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