February 20, 2025
Full Momentum Episode 37: All Things Gates
Gates play a crucial role in hydraulic modeling, impacting water flow, flood control, and dam operations.
Is it normal with a 2D full momentum model to run without any WSEL errors? Or should I expect a few?
You can have a 2D full momentum model without errors if:
- Your cell size and computation interval is appropriate
- Everything is moving very slowly
- Stages are high
- Slopes are shallow
- N values are high
- Discharge doesn’t change too suddenly
- It’s a 2D only model (i.e. no connections to 1D)
- You are a skilled HEC-RAS modeler
- A combination of any or all of these (and some other factors I’m not thinking of), sure, you can have no errors.
Is it normal? I certainly wouldn’t call it abnormal. Actually, you’d be surprised at how well the 2D solution works compared with the 1D solution. I’ve found I get a lot less errors and instabilities in 2D areas than I do with 1D reaches. Most of the time, my big errors happen at and around 1D/2D connections.
If you are lucky to get a simulation with no errors, double check your solution-make sure it looks reasonable. Your instincts are correct and you should question the results. But if everything looks good and reasonable, chalk it up to your skill and claim your bragging rights!
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