[John Clark]

Thanks Michael.

It should be the same for upstream boundary condition? The inflow and outflow are made from lateral structures.

[John Clark]

I already saw it. Although it is not the same situation that I would like to simulate.

Probably the best solution is: 2 cross sections with Stage hydro hydrograph BC (in order to represent the tide levels) -> inlet structure (representing a “wall” for the channel in upstream) -> lateral structure with flap gate connecting US and DS of the “wall” structure.

It appears to work fine!

[John Clark]

Thanks Michael.

The problem is that I need to count with the inlet channel capacity as a reservoir. If I only put one lateral structure in the main channel I will not be able to do it right?

What is your suggestion to model the following scheme (upstream of the inlet structure):
river with tidal effect -> intake flap gate -> inlet channel (like a “reservoir”)?

I can not simulate the river as a storage area right? because I think that it is not possible to define a time series level stage boundary condition in storage areas.

[John Clark]

Sorry I did not get it. If I connect the inlet channel with the main channel, there will be 2 “connections” between the 2 channels (the flap gate and the junction).
How can I avoid flow leaving the main channel into the inlet channel through the junction, even with a very wide cross section?
Actually I want to model the inlet channel as reservoir (storage area).

I did not find a boundary condition for the time series level for a storage area.

[John Clark]

Hi Michael. You are right a schematic overview always help!

In my simulation, the inlet channel is not connect with the main channel (as you can see by the image cross section 1 is the last cross section). In cross section 1 I have a BC of a rating curve with almost zero flow, in order to avoid the inlet channel to lose water when both tidal gates are closed.

In my simulation the tidal gate 1 is simulated as a lateral structure flag gate avoiding negative flow (from main channel to the inlet channel). I have not yet the tidal gate 2. I would like to set the levels in the river as a time series. It is possible to do with a storage area? And then connect with a flap gate to the first cross section of the inlet channel?

Sorry for all my questions and long post

Thank you very much for your help.

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