Assistance Needed on SWAT+ Streamflow Calibration Using SWAT+ Toolbox

[Haris B. Ukat,CE]

Hi everyone,

I am currently working on my dissertation using SWAT+ to assess streamflow of a river.

I would like to seek your guidance on the use of SWAT+ Toolbox, particularly on the model calibration process. I am having difficulty improving the model performance, as my calibration results consistently show negative efficiency values (e.g., NSE < 0) despite several attempts. I would be sincerely grateful for any advice, references, or mentoring that you could share.

Thank you in advance for your help.