how swat- cup calculate nash sutcliffe?

[shahab zarezade]

Hi dear all

 first time I ran swat-cup with  30 simulations while I chose only Cn2 ...... 0.....0 

you can see result underneath 

before running swat cup I calculated R2 and  nash sutcliffe in excel they were 0.655 and  0.64 respectively but the results in swat-cup are different as you see above

what is the problem?

I use this formula for calculating  nash sutcliffe (I found it on the net)

=1 - sumproduct((A1:A12 - B1:B12)^2) / sumproduct((A1:A12 - C1)^2)

where C1 is:

=average(A1:A12)

and A1:A12 contains the observed discharges Qo, and B1:B12 contains
the modeled discharges Qm

is it correct to calculate  nash sutcliffe?

finally what is your suggestions for improving my model?

best regards 

[Abbaspour, Karim]

Why would you run 30 simulations? The idea there is to run one simulation, which would be your original model, so you could use that to set your parameters.

Also, your swat.exe may be different from the swat.exe in the swatcup program. Replace the one in your swatcup project with your own swat version.

Karim

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[shahab zarezade]

Thank you dear Karim
You are right. I had to run 1 simulation
I'll do your suggestion
Regards