Welcome to the RAS Solution Forums HEC-RAS Help Lateral Inflows in 2D

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  • #7367
    DH
    Participant

    Hello,

    Is there a way I can add lateral inflows to a 2D model? (Similarly to assigning a lateral inflow hydrograph BC to a specific XS in a 1D model.)

    I already have an upstream flow hydrograph BC, but I want to add to these flows at a downstream gauge location to account for lateral inflows.

    But, when I add a flow hydrograph BC internally, the flow goes forwards and backwards from this BC line, causing the channel to flood excessively upstream of it.

    Thank you,

    DH

    #12384
    ckatsoulas
    Participant

    why not add a wall behind it (using SA/2D connection) so that water does not push backwards. After adding the SA/2D connection change the weir elevations to be above the water levels and that way the flow will then proceed in downstream direction

    #12385
    DH
    Participant

    This would affect flows coming from upstream of where I want to add my lateral inflows. I want to add to the flow of the channel without interfering with it.

    #12386
    ckatsoulas
    Participant

    ok, why don’t you use a culvert to transfer the flow.

    I would place my inflow in a non flooded area and then collect the water with a large sized culvert. To ensure no loss/spillage of flow you could put an SA/2D connection to trap the flow at that location so it all gets into the culvert. The culvert should hopefully have positive momentum into the channel. Depending on the channel grade I think regardless of what you do you will always get some backwater effect until flows upstream start to combine.

    #12387
    DH
    Participant

    Okay, I’ll try that. Thanks for your help!

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