Calibration trade-off: good fit on small events, underestimates large flood

[Barbara Popczyk]

Dear WRF-Hydro community,

 I have a calibration problem in my WRF-Hydro setup for the 1742km2 mountain catchment in Poland.

 During the period June–September 2024 (with several small events and one major flood in mid-September), I face a strong trade-off:

 - When parameters are tuned for smaller events, the model significantly underestimates the large September flood peak.

- When tuned for the big flood, it strongly overestimates peaks during smaller events.

 I mainly adjusted REFKDT, OVROUGHRTFAC, MaNN, but the conflict remains.

 Has anyone experienced similar behaviour?

What parameters or approach helped you to find a better compromise?

 Any advice would be greatly appreciated.

Best regards,

Barbara