Modeling culverts with stormdrain junction in 2D

[laurenaliviamorgan]

Hello all, I have created a 2D HEC-RAS model with 1D culverts as 2D connections for floodplain purposes. One aspect has me stuck — I am trying to create a stormdrain with 3 different culverts connected to it. I’ve attached an image. The circled junction is the stormdrain.

I figured I could model the stormdrain as a storage area and connect the culverts somehow, but I’m not sure how to go about this. Alternatively, I believe I could possibly add flow hydrographs instead of modeling the culverts at all.

How would you approach this situation?

Thank you for your help

[Anonymous]

If you know the flow hydrograph you can draw a boundary condition line inside of the 2D area.

That sounds easiest.

If you want multiple culverts coming out of a storage area you can try doing them as 1D reaches using cross sections with lids. It works in theory but can be tricky in practice because of stability issues.

[Author]

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