Allowing a calibration against additional variables (e.g. reservoir volume)
With airGRiwrm, we simulate more variables that could be linked to physical systems, and sometimes observations exist. We can make the hypothesis that using these additional sources of data for calibration could make the integrated model more robust (i.e. more temporally or spatially transferable). Therefore, it would be great to allow that. I guess that allowing that would require some changes in airGR (namely, allowing the access to other variables than Qsim, SWE and SCA for calibration).