ET and FLOW_OUT calibration tips

[Rym Hadded]

Dear Dr Kareem,

I calibrated my swat project with swat cup 2012 with one variable (fllow_out) but when introducing the second variable the ET , it didn't work. 

my project is daily time step and the study site is very ard climate so the calculated Et is so low comparing with the observed one and the calculated discharg is too high comparing to observed one.

to solve errors (which are the same when there is a mistake in input data and when the calculation don't converge to  a solution) I did first a calibration with canmx separately and then with ch_k1 an ch_k2 to reduce the calculated flow _out and then I introduced other parameters to ameliorate the result.

but when introducing the ET variable it didt work . I reduced the parameters to esco , epco, GW_revap, revapmn but this error appears :

please is ther some tips to calibrate th ET? 

may be calibrating with monthly data is better ?

I have 2863 number of data points for the ET variable, may be is too big data ?

please if someone have experience with ET calibration give me some tips on this mail rimno...@gmail.com 

thank you

[Wang Kelin]

I have the same problem too. May I ask how you solved it?