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Why does my junction node reach a maximum peak flow rate?

Nathan Doty
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I have a pond (Basin F) upstream of a junction node (POI 4A).  POI 4A has its own catchments, and is also directly downstream of the Basin F composite outlet structure.  

When I run the model, the peak flow rate through POI 4A is 113.75.  If I make changes to the Basin F composite outlet structure, the peak flow rate through POI 4A is still 113.75.  Why is my junction node reaching a maximum peak flow rate?  

If I disable the POI 4A catchments, such that Basin F is the only upstream flow contribution to POI 4A, then changes to the Basin F composite outlet structure do effect changes to POI 4A flow (such that Basin F out = POI 4A in).

Thanks,

Nathan

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  • 0 Offline
    Hi Nathan,

    We noticed that you also submitted a service request for this. An answer should be provided to you shortly (if not already) via your service request (it is related to the timing of the junction's catchment's peak flow compared to when the pond elevation reaches the orifice in question.)

    After your service request has concluded, we'll post the solution here.

    Thanks,


    Regards,

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

  • 0 Offline in reply to Jesse Dringoli

    In this user's case, the peak flow in the junction node was being reached before the peak flow was happening in the pond.  As shown in the graph below, you can see this happening.  The elevation in the orifice is 59".  The pond does not peak until 12.22 hours while the junction node peaks at 11.93 hours.  Therefore you do not see a change when looking at the properties.

    Terry Foster
    Technical Support
    Hydraulics and Hydrology product line
    Bentley Systems, Inc.


    Answer Verified By: Sushma Choure 

Reply
  • 0 Offline in reply to Jesse Dringoli

    In this user's case, the peak flow in the junction node was being reached before the peak flow was happening in the pond.  As shown in the graph below, you can see this happening.  The elevation in the orifice is 59".  The pond does not peak until 12.22 hours while the junction node peaks at 11.93 hours.  Therefore you do not see a change when looking at the properties.

    Terry Foster
    Technical Support
    Hydraulics and Hydrology product line
    Bentley Systems, Inc.


    Answer Verified By: Sushma Choure 

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