I have the polygon of my catchment of interest, I call it catchment A (Reyran in the schema). (format
I have also the x-y coordinate of a dam that is situated in the catchment. I have also a
*.tif file that includes elevation information of the catchment A.
I would like to define and split in GRASS (QGIS) the corresponding upstream (catchment I) and downstream catchment (catchment O) that we could define in catchment A at the upstream and downstream of the dam.
I need to get the shapefile (
*.shp) of the upstream catchment. How could I do it? Here is the schema of the catchments.