Hydraulic tunnel model

[GMF]

Hello, good morning;

I have modelled a long hydraulic tunnel (circular section) adding Lids in each cross section of the tunnel.
I have defined the bottom half of the section with Cross Section Coordinates (Station/Elevation) and the top half adding Lid with High and low coordinates (Station/High elev/Low elev).

the model apparently works properly but I have some doubts:

1- Which are the Manning´s Values at the lid (top half of the section) and how could I edit them?
I have slight deviations results between the model and simple check calculation in uniform regime and it could be because of that.
2 – When I check the result table of the model, I notice the top width is slightly bigger that the diameter (4.5m versus 3.7m approximately) What is the reason?

Thank you very much for you Help.
Kinds Regards

GMF

[Romain PAUL]

Hello,
Do you find an answer for your Manning into the LID? I have the same doubt.

Thank

[Luis Partida]

Mannings values are still controlled by the cross-section data editor just as if a Lid is not in place. If you want to vary roughness within the tunnel use vertical variations in mannings values by clicking options

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