In this tutorial, you will learn how to derive a river network through the identification of Strahler Order, and how to derive the corresponding catchment (watershed) pertaining to a defined outlet location along the river. The tool which is being used for this delineation of catchment and the derivation of the stream network is the SAGA tool of QGIS.

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Deriving River Network & Catchments from a DEM using QGIS
2.75 GEEK