Can you draw culverts either way, or is one of these wrong?

[Wick]

Hi all,

Having some trouble with culverts in 2D flow areas. I had been tracing my culvert line as a SA/2D connection, then copying the GIS coordinates and pasting as the barrel centerline, but I was getting errors that my culvert did not cross the GIS centerline on occasion (option 1). So I tried drawing it as you would a bridge with a culvert passing through (option 2), and that seemed to work. Is it okay to draw a culvert either of these ways? Here are some images of what I’m talking about: https://imgur.com/a/XeA4T1E

Thank you!

[alister.hood]

“Perpendicular” is the only way that makes sense. The culvert is going through a road embankment or similar terrain feature that acts as a barrier to flow. Normally you should draw a 2D breakline along the crest of this feature. If there is a culvert through the feature you convert the 2D breakline into a 2D connection.
The angle it crosses should match reality, so it doesn’t need to be truly perpendicular (90 degrees).

[Author]

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