Don't get Qr in my results

A discussion forum for RETC users. RETC is a program which can be used to analyze the soil water retention and hydraulic conductivity functions of unsaturated soils.
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Ikenna
Posts: 9
Joined: Wed Apr 11, 2012 9:08 am

Don't get Qr in my results

Post by Ikenna » Fri Apr 13, 2012 7:20 am

Hi dear,
I'm using RETC to predict hydraulic parameters from measurements of water content and potential. After I run the program, I only get Qs, alpha and n in the ASCI output file.
Why am I not getting Qr?

Thanks!
Ikenna
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Jirka
Posts: 6195
Joined: Sat Mar 16, 2002 3:47 pm
Location: USA
Location: Riverside, CA

Post by Jirka » Fri Apr 13, 2012 1:55 pm

It is probably equal to zero. It should be mentioned in the output file. J.
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Ikenna
Posts: 9
Joined: Wed Apr 11, 2012 9:08 am

Post by Ikenna » Fri Apr 13, 2012 3:10 pm

Ok.
Many thanks!
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tcolivei
Posts: 3
Joined: Mon Dec 11, 2017 7:15 pm
Location: Brazil

Re: Don't get Qr in my results

Post by tcolivei » Tue Jan 19, 2021 7:44 pm

Dear Jirka,
Even with Qr equal to zero, it should be associated with a standard error, isn´t it?. I am getting a bunch of Qr=zero, however I need the standard error to compare the quality of the prediction with other methods (e.g., inverse modelling).
Thanks!
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Jirka
Posts: 6195
Joined: Sat Mar 16, 2002 3:47 pm
Location: USA
Location: Riverside, CA

Re: Don't get Qr in my results

Post by Jirka » Tue Jan 19, 2021 8:39 pm

RETC (which is not written by myself) stops fitting Qr if its fitted value drops below 0.001. It then sets Qr=0, and drops it from the list of fitting parameters. The code can then not give you the standard error. J.
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