Question about Flow Variable for SWAT+ CUP Calibration

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Mahabub Chowdhury

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Mar 12, 2026, 10:23:08 PM (4 days ago) Mar 12

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Hello,

I am currently working on flow calibration in SWAT+ CUP and I am a bit confused about which output variable should be used for channel flow.

In the SWAT+ CUP calibration example shown in Karim Abbaspour’s video, the variable channel_sd_morph_day is used for calibration. However, when I checked the SWAT+ GitBook documentation and related GitHub discussions, I found that flo_out_mm is described as channel outflow for the morphology output, while in channel_sd_day the variable flo_out is reported in units of m³.

Because of this difference, I am unsure which variable is appropriate for discharge calibration against observed streamflow data. If I follow the Abbaspour video, it seems that the Channel Morphology output should be used.

Could you please confirm whether channel_sd_morph_day is the correct output for flow calibration in SWAT+ CUP, or if I should instead use the flo_out variable from channel_sd_day?

Thank you very much for your time and guidance.

Best regards,
Mahabub

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