[Chris Goodell]

Rich-thanks for that tip (I realize I’m about 7 years late to this party)! 🙂

[Chris Goodell]

The program crashing is a bug. You might try a different version of RAS, and/or check the release notes/known bugs documents on the HEC website to see if HEC is aware of this. As for the cross-crossing, you already took care of the two most likely culprits (cross sections must be drawn left to right, looking downstream and the stream lines must be drawn from upstream to downstream). I’m not sure if this would cause edgeline issues, but I have noticed poor and/or inconsistent bank stations can cause some weirdness in the interpolated surface, so you might look into that as well. Good luck!

[Chris Goodell]

Eric, thanks for the reminder. This fell (way) off my radar. I’ll see if I can get it fixed asap.

-Chris

[Chris Goodell]

Hi Andre- To avoid these issues, you need to change your Windows Regional Settings to English (United States). Just changing the decimal character type to “.” is not enough as you found out. Language and dates also have an influence on RAS operation. So best to just get it all set properly with by changing the regional settings. Hope this helps.

[Chris Goodell]

That sounds like a bug. I would send a bug report to HEC.

[Chris Goodell]

Hi Kendall. If your bridge abutments (as defined in the SA/2D editor) significantly blocks the bridge opening, then yes, you should include ineffective flow areas under the options menu item in the SA/2D editor. They will impact the bridge HTAB curves which are used to simulate the force impact of the bridge in 2D equations. And yes, it’s a good idea to use the 2D results to help inform how you would set up the ineffective flows (better that than to use the old “ratios” method.

[Chris Goodell]

I agree with Eric. Also, increase your weir stablity and decay exponents to 3 (computation options and tolerance window).

[Chris Goodell]

You would probably have to look deep into the plan HDF file. You might explore the HDF5 Write Parameters in the Output Options window and see if there is anything in there for you.

[Chris Goodell]

Do any of your bridges happen to be named “2D bridge”? If so, that’s the one.

[Chris Goodell]

The profile plots are only for 1D reaches, that’s why the drop down boxes are empty. You can draw a profile line in RAS mapper over the culverts, but in the current version, you won’t be able to see what is happening inside the culverts. That ability is not yet available in RAS. Hopefully soon!

[Chris Goodell]

Impossible to know for sure what is causing your model to crash without seeing it. I suggest try deconstructing your model, one element at a time, running between each one so that you can isolate the element that is causing the crash. That may help inform you how to fix it.

[Chris Goodell]

Paul, I’ve never heard of that issue before. Not sure what is going on. The only thing I can suggest is to keep trying, but try differently. What I mean is try to draw your river again, but see if there’s a different sequence of mouse clicks or whatever that makes it work. Kind of a long shot, but sometimes you just have to try to “trick” RAS. If you can’t get that to work, you should send a bug report to HEC about it.

[Chris Goodell]

That’s going to be tricky with the built in functionality of RAS. In short, there’s no direct way to do this. However, if you can develop rating curves for the gate/culvert combos, then you can use the Rules boundary condition to do this (I think). Will require some scripting on your part.

[Chris Goodell]

Keep in mind that when you add in a bridge, it will use whatever low flow bridge method you select to add an extra force term to the cell faces at the bridge centerline. So there will be some difference for sure, even if the water does not touch the bridge deck. You might be able to minimize this effect if you use very small n values on the bounding “dummy” cross sections, but that is just a guess. My suggestion would be to not include the bridge if the water doesn’t touch the deck and there are no piers.

[Chris Goodell]

Sounds to me that you have those RSs listed in your unsteady flow file, but there aren’t enough flow records in each to cover the entire simulation.

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