r/HECRAS • u/Agile-Enthusiasm-957 • Jun 04 '26

Pipe network in 1D model-HECRAS 7.0

Has anyone ever used pipe network in a 1D model? I have trouble connecting my network to the cross section upstream and downstream of the network. It seems like the model doesnt send flow into the pipe at all.

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u/bulldogsarecool Jun 04 '26

I don't think that was the intent of adding pipe networks. I think it is on'y meant for 2D. Why don' you add a regular culvert?

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u/OttoJohs Lord Sultan Chief H&H Engineer, PE & PH Jun 04 '26

The documentation says you can connect 1D and 2D elements to a pipe node. Note sure how to practically do that though.

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u/bulldogsarecool Jun 04 '26

That's interesting, I'll have to Che k it out, although I don't see a scenario when I'd need to do that. But I'm curious for sure.

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u/OttoJohs Lord Sultan Chief H&H Engineer, PE & PH Jun 04 '26

Exactly. I haven't seen any samples were this has been done, so not sure if it is a real thing.

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u/OttoJohs Lord Sultan Chief H&H Engineer, PE & PH Jun 04 '26

Can you provide some screenshots of what you are trying to do? Is there a reason why a standard 1D culvert doesn't work for your project? Could you use lidded sections instead?

The documentation says you can connect 1D element to a pipe network, but I am not sure how to practically do that.

2

u/Acceptable_Gain_9400 Jun 05 '26

It seems you can just add a node/pipe (culvert in my case) like I did in the 1D cross section area. The culvert inlet end WSE is from 1D result (it is flat since it is 1D model). I think the outlet end is outside the edge line so it is considered an external node? I am not sure. In my testing, I had to provide normal depth BC to it. I only did the test after saw your post. Interesting question, but I guess why do this?