Anyone who know if there is a method of creating rivers network from digital elevation model in qgis as it does in contour.

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You can use TauDEM: https://docs.qgis.org/2.18/fr/docs/user_manual/processing_algs/taudem/index.html

It uses code from http://hydrology.usu.edu/taudem/taudem5/index.html, which can be used also outside qgis

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