culvert upstream and down stream opening is not same

[sthsajan]

how do we create a model if the culvert opening is different in upstream and downstream?
upsteam 34 ft wide and down stream 6 ft width

[Chad Ballard]

Have you thought about a rating curve instead? The approach that I would probably use would be to develop a rating curve outside of RAS then apply it to an inline structure to represent the culvert. Would be a tricky thing as the culvert changes from inlet to outlet control while I have not modeled a culvert like yours, I have used this approach to model complex structures that do not exactly fit the standard inputs.

[Anonymous]

Just like many of your posts, the answer would be lidded cross sections.

[sthsajan]

I am thinking to make a lidded cross section since I have a cross section in upstream and down stream and I will get few cross section with in the culvert with interpolation so I can get the real opening of the culvert.
just wondering will it give me the correct water flow level in steady flow analysis?

[Author]

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