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PondPack - Two Detention Ponds to Single POI

PondPack - Please see the following scenario that I am running with PondPack:

- Two detention ponds outfalling to POI
- Onsite bypass drainage area outfalling to POI
- Offsite drainage area outfalling to POI

Is pondpack able to h andle the scenario above? See files attachedPOI4_Pre_and_Post_with DP.zip

  • Hello Zhen,

    Can you explain more what the "POI" represents? If both ponds and the two larger catchments discharge to a common collection point, then yes, PondPack can model this. The screenshot and model you provided appear to be set up in this way, and I do not see any obvious problems with the setup. The flow at a given time from the four different sources appears to add up to the flow seen at the outfall.

    Are you trying to size the ponds using PondMaker, or are you manually entering the desired pond and outlet dimensions? The following article explains how to account for bypass flow with the predevelopment target in PondMaker, but I suspect that you may not need to use PondMaker in this case.

    Accounting for bypassed (undetained) flow in PondMaker


    Regards,

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

  • Jesse,

    Thanks for your response! 

    POI means Point of Interest which is the outfall point of Drainage Area. 

    I manually input the pond dimension and would like to design the pond outlet structure using PondMaker function. Thanks!

  • Hi Zhen,

    The article in my previous reply should help you understand how to adjust the predevelopment target peak flow in the PondMaker wizard to accommodate any undetained flow, but you can only design one pond at a time, so you'd need to also subtract an estimate of the peak outflow of the second pond. So in this case, you might consider designing the pond manually instead of using PondMaker. Meaning, select an estimated pond outlet structure for each pond, compute the model, observe the peak flow at the POI/outfall, adjust if needed, re-run, until you achieve the desired result.


    Regards,

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

  • Jesse,

    May I know what do you mean by I can only design one pond at a time?

    Can I have two detention ponds in PondMaker, then export scenario in Step 6 for both, then compute the post development scenario? 

    Please let me know if you find any problem in my model. Appreciate it!

  • Hello Zhen, 

    Using Pondmaker you can design a single pond at a time and not multiple ponds. So you would need to design ponds separately if you intend to use Pondmaker tool. Hence Jesse mentioned about designing the pond manually instead of using PondMaker.

    In your model, for scenario - post development 50 year, pond DP=1 is having some issues as it is over-topped and you need to revise the pond dimensions, please see below link for more information on this. 

    Elevation-flow-volume table data overtopped...routing results invalid user notification

    Regards,

    Sushma Choure

    Bentley Technical Suppport