Steady Flow calculation stops!

[BlondesGift]

Hey guys,
I have built up my hecras model and changed the levees and ineffective flow areas. Then I wanted to calculate it. But the calculation stops after a few seconds in the calculation of XS Interpolation Surface (see Image). I don´t what to do now. Had anyone ever the same problem? I would be very thankful for help (Sorry for my bad english).

[cameron]

Was it ever working? I have seen HEC-RAS have issues like this when some of the cross-sections are set up to close together and are different lengths or cross-sections are overlapping.

[BlondesGift]

Hello,

thank you for answering! Yes, it was working. I have extended a cross-section to better represent the foreland. Then it was still running. After changing the levee in a cross-section the computation stops…
The cross-sections are set at a distance of 20 m from each other and do not overlap. Now I have adjusted the length to minimize the difference….but it still stops…

[cameron]

I would start doing tests by removing items until I found the issue. In your case, I would start with the levees by removing them all and adding them back in 1 at a time until the problem occurs.

[BlondesGift]

First I deleted the Levees. Computation stoped. Then I deleted the Ineffective Flow Areas. Computation still stoped. Then I upload the geometry via CSV and replaced the cross sections. Computation worked…
Thank you for your help!

[Anonymous]

Hi,
I have the same problem and cant seem to figure out the underlying issue. Also, I am developing HEC RAS model for the first time.
My model has 520 cross sections along four tributaries of total 42 km in length. The model works fine for 2-3 km reach in each tributary but the model stops computation, if I try to run it for the entire tributary. The weird part is- I have used the same approach for obtaining cross sections throughout tributaries. Any suggestion will be highly appreciated!
Thank you!

[BlondesGift]

Thank Nits for you post. It is certainly helpful if everyone describes the problem here if it occurs. So maybe we can figure it out…

… now in an other project the problem occurs again. It is a small model with 15 cross sections. Everything was fine till I interpolate new cross sections to integrate bridges. Than the computation stops! I don´t know why and I don´t want to build up the model again…

I would be really, really grateful for any suggestions! It is so frustrating…

[BlondesGift]

Hey Nits! Please try to run your model with the old HecRAS Version 4.1. I tried it and – tadaaaa- the model runs. I can now easily add, extend or interpolate cross sections and the computation runs. With the Version 5.0, 5.02 und 5.03 the problem appears.

I hope this was helpful 🙂

[Author]

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