Flat Water Surface Elevation

[Anonymous]

Hi,
I am working on a small steady flow model with cross sections every 25 ft. When I run the model the water surface elevation is a straight line at an elevation much higher than the expected elevation. I feel like this could be caused by an issue with my boundary condition. I am using a known water surface elevation for my downstream boundary condition.

Any advice/suggestions would be helpful. Thank you.

[Anonymous]

Unless there is an error in your model I suspect your boundary condition is well above normal depth. You can test this by changing the boundary condition to Norma ldepth. If the profile drops then you will know the known water surface is the issue.

[Anonymous]

I have changed the boundary condition to normal depth and that didn’t change the water surface elevation. I have no errors when I run the model. The water surface elevation is well above the critical water surface elevation.

[Ian Sharp]

Manning’s n too high?

[[email protected]]

Hello,

Did you ever solve this issue. I am running into the same problem

[cameron]

what is your downstream boundary?

[Anonymous]

Hello, I have similar problems with steps in water stage and undesired bank overflow especially in areas with bridges while performing steady flow model. Current goal is to keep water in channel.
I have a reach that splits and join back to the main river channel. Flow data at start and end of the reach where calculated (not observed data). Boundary conditions at the beginning and end of the whole river network are Normal depth data approximated from channel slope. I have tried to change the “n” values in the channel, High Flow Method (Bridge Modeling Approach Editor), but no results.
Any proposed ideas would be highly appreciated.
Best regards,
Nikol

[Author]

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