The simulated flow in SWAT+ Toolbox is generally about 30 times higher than the measured flow

[Pengxuan Zhu]

Dear SWAT+ Developers,

I am a student currently using SWAT+ for my research, and I’ve encountered several issues during calibration that I hope you can assist with.   Below are the details:

1.   Discrepancy Between Simulated and Measured Flow
The simulated flow in SWAT+ Toolbox is consistently ~30 times higher than the measured flow.

Setup Details:

Created HRUs following YouTube tutorial guidelines.（https://www.youtube.com/@openwaternetwork/videos）

Used Weather Generator with SWAT2012-format weather station data for meteorological input.

Calibrated using monthly observed flow data.

2.   Data Import Issue in SWAT+ Toolbox
When importing observed flow data (monthly), the values displayed in the Toolbox do not match the original file:

Original max value: ~1000, but imported max is significantly higher.

Imported min values are also lower than observed.

3.   SWAT+ Toolbox Version Problems
Initially used v2.4 (bundled with SWAT+ from the official website， Installation | SWAT+ Installation & Help  ).

Attempted to upgrade to the latest version, but the Toolbox crashes on launch (even after adjusting OS time/number formats as suggested in other threads).

I have attached my pictures and the observed flow data

Request for Guidance
Are there known fixes for the flow overestimation ?

Could the data import issue be related to unit conversions or formatting?

Any solutions for the Toolbox crash in newer versions?

Thank you for your time and support.   I’d greatly appreciate any advice or troubleshooting steps.

Best regards,
Pengxuan ZHU
Nanjing University of Information Science and Technology/Student