Different manning n values for channel bottom, walls and lid

[Anonymous]

Hello people,

I am modelling the flow (mostly steady, free flow) inside of a diversion tunnel, and would like to define different roughness coefficients for the channel bottom, the walls and the lid.
I haven’t found a way to do this, anybody got a solution or idea?

Thanks for any advice

[Anonymous]

In the geometry data editor select options and select “vertical variation in n values”

However, this would require you to model the tunnel using cross sections with lids.

[Author]

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