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SewerGEMS Best Way to Connect Conduits to a Channel?

I am working on a stormwater modeling using SewerGEMS, and I will need to connect a couple of conduits to a channel element (see simple diagram included). I am hoping that someone could show me what the best way to connect these conduits to a channel is. I am new to using channels in SewerGEMS and want to make sure I get this channel set up correctly. It looks like I will need to have at least one cross section to define my channel (it is a uniform channel, so only one is needed unless it is better to use more than one). Each of the conduits will have an end section where they dump into the channel. It looks like I could use either a headwall or an outfall on the end of my conduits. My question then is how to get my outfall/headwall connected to the channel? If someone could set up a diagram similar to what I have provided using SewerGEMS elements that would be great. Thanks!

  • Hello Joshua,

    Cross section elements can be used to create channels or gutters, so you could use cross section elements here to define a channel. 

    Conduit vs. Channel 

    Also you can read about connecting model in help documentation. 

    Your network can look like below. 

    Regards,

    Sushma Choure

    Bentley Technical Suppport

    Answer Verified By: Joshua Hesting 

  • Thank you for the reply. So in this instance is it not necessary to have the outflow headwalls for each conduit modeled? I can go ahead and connect the conduit straight to the channel cross section? Just want to make sure I wasn't leaving out something.

  • Joshua, 

    You would probably only model the outflow headwalls if they made some significant hydraulic difference in the results of what you're modeling. If there isn't going to be, then yes, you can leave them out. You might also be able to account for any small headlosses in the channel cross section if you want to take some of the losses the headwalls might have into account. I haven't looked at the properties of the cross sections in a bit though, so I can't say that for sure. 

    Mark 

  • Hello,

    To add to Mark's response, it is possible to model headwall elements at either end of the channel, which will help account for headlosses. The channel link element shape is typically defined by cross sections. This is why you often see cross sections used as the end nodes for a channel.

    However, you can also use headwalls. In the section "Headwall on both sides of a channel" of the link above, you can find the general steps to do this. If you set the property field "Has Cross Section?" to True, you can define the shape of the channel. Since you are using the headwall element, you can also set the inlet description to define losses related to the opening of the headwall and endwall.

    Regards,
    Scott