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Pond Outlets - CivilStorm vs. PondPack

Hi.  I typically use PondPack for pond modeling, but have been working more with CivilStorm lately.I have noticed that the pond outlet control structure (P.O.E.) is included in the link in PondPack and conversely the pond outlet control structure included in the node for CvilStorm.

The question I have is what information would I put into the CivlStorm link (coming from the P.O.E.), especially in the event the outlet is a culvert?

A few things I tried was using a virtual link (which apparently was not allowed), repeating the culvert twice (in the node and link), and modeling the culvert as an orifice in the node (P.O.E.) and as a culvert in the link.

Suggestions?

  • Hello Seth,

    In CivilStorm (and SewerGEMS), the link element (conduit or channel) downstream of a Pond Outlet Structure node represents the link that the control structure discharges to.

    The culvert pond outlet control structure represents a restriction due to the entrance of a culvert barrel. Although the barrel length is a parameter, you likely won't be double-counting by connecting this to a conduit that represents the length of the culvert barrel.

    If the pond outlet represents a culvert (or a weir the shape of the downstream channel), another option is to set "Has Control Structure" to "False" for the Pond Outlet Structure. In this case, assuming you're using the Implicit dynamic solver, the program will still simulate restriction based on the shape of the adjacent link element, then discharge the pond outlet into the upstream end of the link. See more on this here:

    Pond and pond outlet assumptions in StormCAD, SewerGEMS, CivilStorm and SewerCAD

    However with recent releases of CivilStorm, the Headwall element may be a better option for you. With this, you can replace the Pond Outlet Structure node with a Headwall connected to a conduit and the culvert loss and pond outflow restriction will be simulated.

    More on headwalls here:

    Headwalls


    Regards,

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

    Answer Verified By: Seth E 

  • Thanks for the update.  I am validating a model, and wanted to make sure I was entering info correctly.
     
    I did try using no outlet structure, and using the downstream culvert, but the pond ended up drawing down way too fast.
     
    Seth V. Erlich, P.E.*
    Project Engineer IV
    CHA ~ design/construction solutions
    Office: 518.453.3914
    *NY, GA
     
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