modelling a gate with tide

[Pallo]

Hello,

I am modelling in HEC-RAS a channel which discharges into Baltic See.

At the end of channel there is a gate, which is normally opened.
If the tide elevation is higher than 0.6 m, the gate will be closed. However, if the water elevation of river is higher than tide, it will be opened again.

Any idea to do that in HEC-RAS, please?

[Anonymous]

If you cannot come up with a simple way to do this, you could certainly do it with the Rules feature.

See Chapter 16 of the User manual: User Defined Rules for Hydraulic Structures.

[Pallo]

You are right. I have to use “Rule Operations”.

But I have never used this windows and I don’t know very well.

Thanks

[Anonymous]

There are some sample data sets that should have been installed or are available under help.
The Unsteady Rule example data sets can help a lot.

[Chris G.]

You could also use a lateral structure. The lateral structure has a flap gates option for culverts, which only allows one way flow. However, this is a simple binary operation in that it is open if the river is higher, closed if the sea is higher. There can be no other conditionals like “if the sea reaches 0.6 meters, close the gates”. In that case, I would certainly take Jarvis’ advice and use the gate rules scripting feature.

[Pallo]

Thank you.

My model with Rule Operations didn’t work and I didn’t find the mistake. Fortunately I could make it manually.

[Author]

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