Use QGIS to Delineate the Catchment of Discharge Measurement Coordinates
Channel: Hans van der Kwast
Date: 2021-06-19

This video demontrates how to delineate a catchment of a known lat/lon coordinate of a discharge device. Two methods to get the point in QGIS are used: (1) import CSV file and (2) digitize lat/lon coordinate using the Lat Lon Tools plugin. The SAGA tools are used for the channel and catchment delineation.

Data: reprojected and clipped SRTM DEM, backdrop (c) OpenStreetMap Contributors
Software:

QGIS 3.16 LTR
SAGA tools
Lat Lon Tools plugin: https://github.com/NationalSecurityAgency/qgis-latlontools-plugin/#readme

0:00 Introduction
0:40 Fill sinks
1:23 Add coordinate from CSV file
3:48 Creat point from coordinate using Lat Lon Tools plugin
5:05 Derive channels
5:50 Snap pour point
7:07 Add XY coordinate to attribute table
7:44 Delineate catchment
8:22 Polygonize catchment

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