regarding parameters range.

[raghu rai]

I am working on Mahanadi river basin. Now I am trying to calibrate my model so I am considering 13 parameters. With all the13 parameters, I am getting good statistics R2=.85 and NSE=.82 like. but with that out of 13 perimeter 2 or 3 parameters coefficient value is beyond the range like v__ALPHA_BF.gw, v__GW_REVAP.gw etc. Why it happening please suggest. I am attaching the all best parameters below.

[omc...@gmail.com]

Hi,

Numerically SWATCUP is telling that the best value for those parameters are outside that limit, however, SWATCUP is program to cap the value of a parameter to the limit. so if your result file tells you that  v__ALPHA_BF.gw best value is -0.46, in reality it is using the min_value of the range of  v__ALPHA_BF.gw, which by default is 0.

What I normally do is to check the range that SWATCUP recomends after every simulation, and then if that range is outside the limit of the variable, I change it to be inside the limit.

Regards,

Oscar