[JohnLonergan]

Hi Jarvus,
I will experiment with what you suggested tomorrow.
I will post again with the result and let the community know how this works.

Many thanks for the advice.

[JohnLonergan]

What has gotten me out of a bind a number of times in HEC RAS is to copy and the error message into google with quote marks. No gurantee but there is a fair that will lead you to a document or site where possible remedies will be discussed. In fact that is how I found this site.

[JohnLonergan]

You don’t need to enter an end time as such in the quasi unsteady flow data file. The end time will automatically be set as the time on the last row of data you entered.
However when you click “run sediment analysis” you must enter the start and finish time separately. You must make sure that the dates/times entered are within the range of dates/time contained in the flow data you enter.
In this “plan” page also ensure that the dates/times are entered in the correct format. ie
Date Time
“02AUG2013 0833” is the correct format but
“02 AUG 2013 0833” and “2 AUG 2013 08:33” are the incorrect format as they have spaces in the date field or “:” symbols in the time. Check this.

Also, ensure that you have specified a downstream boundary condition. Normal Depth is a good starting point. Enter the bed slope of the reach in the friction slope box that pops up.
I hope this helps you.

[JohnLonergan]

Yes, thanks.
I will try doing this today. I will post back to let you know if it is a success.

[JohnLonergan]

Does anyone have any advice on this?

I have this project due in a few weeks and this is presenting a complete block for me. I have been trying different files and using a basic token geometry but same problem occurring.

Any checks I should do or other advice would be greatly appreciated.

Thanks.

[JohnLonergan]

Hi,

I had a similar problem before I specified my temp series.
After I put in my temp data it worked (although I am still encountering other issues).

What I would advise is to review your flow and temp data and ensure that your flow and temp data cover the same period. ie, if you have 50 hours (rows) of flow data you should also have 50 hours (rows) of temp data. Also check that the dates and times correspond correctly in both tables whether that be start dates specified manually (fixed) or simulation time (automatic).

I hope this helps. Let us know how you get on as, as I mentioned, I am having issues with sediment transport calcs too. See my thread “Sediment transport in small hydro power <1MW" if you're interested.

[JohnLonergan]

Oh and I should add that I specified a Normal Depth downstream boundary condition and set the friction slope to 0.04 and saved my flow data. This has not helped.
For some reason when I go back into the flow data boundary condition and click on normal depth again the 0.04 is gone and the box is blank . Is this normal or could it be the issue?

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