Hello again,
I would strongly advise against changing the WL_EXCEEDANCE_FACTOR parameter before taking a better look at your model, as that will prevent you from spotting unstable behaviour in your model which could be simply caused by some overlooked detail that you can easily fix. Changing that parameter should be a last resort measure.
The link works fine for me but I'll transcribe the instructions. Here's what it says:
"Question:
Hydrodynamics: Errors: I get the error message No 25 during simulation:
"Error No 25: At the h-point (location) the water depth greater than 4 times max. Depth".
Why does this happen and what can be done to overcome this problem?
Answer:
This error message essentially says that your MIKE 11 model is unstable (numerical unstable or with erroneous waves introduced due to poor initial conditions)!
It frequently occurs when there is an inconsistency in your bed level elevations at the branch junctions. For example, if the bed elevation of the main branch is much greater than the side branch, then the water piles up and causes this error.
Another typical cause of this error to occur is if the simulation is made with a timestep which is too large compared to what is reasonable when analysing courant number criteria (Cr = v * dt/dx).
Some ways to avoid these are: Decrease the time step, Change wave approximation to Higher Order Fully Dynamic and/or increase the Delta value (0.5 in default) to 0.7-0.8. Wave approximation and Delta value are specified in the HD editor in the tabs Wave Approx and Default Values respectively.
In case the error 25 is caused by poor initial conditions these may either be improved or the allowed factor 4 exceedence may be increased to a larger value. The latter is done in the Mike11.ini file placed in the Windows folder. The line WL_EXCEEDANCE_FACTOR=4 may simply be changed to say WL_EXCEEDANCE_FACTOR=100."
Best regards,
Ricardo Machado
