open TELEMAC-MASCARET The mathematically superior suite of solvers

Hello community. I have a problem with a pretty complex model that I want to perform. The domain contains a small river that crosses an urban area. My first model (that worked very well) consisted of two boundaries as follows:

inlet : Q (hydrograph)
outlet : free (444)

This to consider that there is no mitigation structures in the system.
Now the model that is having troubles uses the same domain and adding a new boundary as follows:

inlet : Q (hydrograph)
outlet : free (444)
intake : Q (stage discharge curve)

Both models starts with dry conditions because I want to appreciate the behavior of the system with no extra water volume added but initial conditions.

In the second model the process crashes with the message:

DEBIMP: PROBLEM ON BOUNDARY NUMBER 3
GIVE A VELOCITY PROFILE
IN THE BOUNDARY CONDITIONS FILE
OR CHECK THE WATER DEPTHS.
OTHER POSSIBLE CAUSE:
SUPERCRITICAL ENTRY WITH FREE DEPTH
IN THIS CASE GIVE A POSITIVE DEPTH
IN THE INITIAL CONDITIONS
OR PRESCRIBE THE DEPTH AT THE ENTRANCE.

The boundary number 3 is the new boundary added to the first model, I mean the water intake that must work with a stage discharge curve (discharge function of elevation)

Someone please could help me with any advice?

Best regards
Ricardo

Hi

What you name intake is a boundary where you want to have a discharge function of the water level.
As every prescribed discharge boundary, you should ensure there is water at the boundary to let Telemac impose the velocities computed to have the right discharge...
Maybe you should create a small pool in front of the boundary to be sure to ensure this condition...

Hope this helps

Thank you so much for your answer. Effectively, this kind of model is pretty difficult to work with completely dry conditions near the boundary with the stage discharge condition. I added a volume the water and it starts to work. But now I think I have another problem. The water intake seems like the discharge curve is adding volume to the domain, but my intention is that the boundary extracts volume of the domain following the stage discharge curve.
Please is just matter of change the sign of the flow rate in the curve, because now is with positive and as I have mentioned the flow rate is been added to the domain.

Best regards
Ricardo