problem to make run off

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Hi users,

In my domain, I have three rivers. I try to use make _runoff in Croco tools but the result is: there are no rivers in your domain. It is mainly because there is not any data about the rivers in my domain. How can I solve this problem? is there any Matlab code to make runoff? or how can I add the features of my river on the data file?

please help me with your interesting comments