In this very short and basic tutorial I will show you how to delineate a catchment using as main income a DEM from ASTER and a point feature, also indirectly other products like the accumulation flow raster and the drainage direction raster will be derived, yet these are not the main points of this exercise. Several tools are available to achieve this purpose, even tools not directly related to GIS like Matlab or Python scripts, but definitely GIS applications are the most widely used in these kind of tasks. The GIS offers a lot of flexible tools in order to derive these products, using as main input a Digital Elevation Model (DEM) of a study area. Very often catchment delineations are required for several processes in hydrological analysis.
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