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Head loss at open channels

Hello,

I'm modelling open channel (trapezoidal section) network in sewergems. is there any direct way to assign head loss in channel merging points instead of inslling dummy manholes and closed conduit channels?

BR

Nishadi

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  • Hello Nishadi, 

    Headlosses are considered in case of catch basins, manholes, headwall, transition elements etc. Headwall is used to model culverts. You can make some assumptions to consider losses in open channel.  A manhole assumes a vertical vault and would account for structure losses based on the selected structure loss method (or no losses, if no structure loss method is set). A transition assumes a sealed junction (no vertical vault) but can also model structure losses.

    Headloss from Entrance and Exit loss coefficients on a conduit 

    Regards,

    Sushma Choure

    Bentley Technical Suppport

  • Dear Sushma,

    Thanks for the reply. Could you please explain it further?

    My requirement is, I have one open channel and another one connected in the middle (another open channel). In that point I need to apply a head loss. How can I do that? (As I have no structure to assign head loss).

    BR

    Sumedha

  • What does this headloss represent? If there is a weir for example, you can use a start control structure on the downstream channel to model the head drop across the weir. You can also use this to model a user defined rating table for the head "loss". 

    Another option would be to adjust the cross section Mannings n to compensate for the head loss. Consider a sensitivity analysis where you try a range of adjustments and observe if there is a significant impact on the hydraulic results.


    Regards,

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

Reply
  • What does this headloss represent? If there is a weir for example, you can use a start control structure on the downstream channel to model the head drop across the weir. You can also use this to model a user defined rating table for the head "loss". 

    Another option would be to adjust the cross section Mannings n to compensate for the head loss. Consider a sensitivity analysis where you try a range of adjustments and observe if there is a significant impact on the hydraulic results.


    Regards,

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

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