[SWAT] ArcSWAT calibration: too large CN2 after SWAT-CUP calibration?

21 May 2021 1 7K Report

Hello everyone,

I have setup and calibrated the SWAT model with SWAT-CUP, the NSE coefficient is as high as 0.85 both for calibration and validation periods at five gauge sites. But the CN2 parameter for most of the subbasins are as high as 98, I don't think it's reasonable in the physical sense. I wonder how can I decrease CN2 by modifing other parameters?

Would you please give me a suggestion about which other parameter is equivalent or have similiar effect with CN2?

Thanks in advance.

Mohammad Reza Eini

Hi,

What is your method for changing CN?

I suggest you change it in +-0.3 range (relative change).

Do not use V (replace) for this parameter and soil-related parameters.

Best,

Mamad

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