hello, I am a masters student. I am using catchment calibration and not pest calibration and my observed is higher than my modelled. when I adjust the parameters, the observed doesn't change. how can I solve this problem.

Essy,

The observed data wouldn't change by changing the parameters. Remember that the observed data is the historical reading from measurements in the field, and would only be affected by changing the time-series itself which contains these readings. Changing hydrology parameters would change the modeled flows instead.

Hope this helps and let me know if I misunderstood your question.

Thanks,
Doug