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Hello Bentley,

I am trying to calculate Peak flow rate  for same watershed with two different software's both calculate based on SCS method. I used Tr-55 and Pondpack model for same case. I also assigned same Tc and same landcover area with soil type. But, I got different results from two software's, where it seems they are nearly close but not too close.

Now my problem is which one is right? Is there any reason behind that  ?

Please find the following attachments. And I double checked that I used same value for both case.