Automate Stream and Catchment Delineation in QGIS with the Graphical Modeler

This video shows how to automate the stream and catchment delineation procedure in QGIS using the Graphical Modeler.
This video is part of IHE Delft OpenCourseWare. More free materials are available at www.gisopencourseware.org
(c) OpenStreetMap Contributors
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Note that with the new dependencies in QGIS this will not work.
For work around see: • Install QGIS with SAGA...
And also see: github.com/qgis/QGIS/issues/4...
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[@asn2406]

Hello hans very good lecture.... please keep for watersheds creation and land use creation.also..

[@romeuandrevieira]

Really nice webinars. Nice book also. But how can I define the sub basin (without having the outlets)?

[@GeoGuru1]

Hello Hans, Thanks for this informative video. Just wanted to know can we connect both the model into one. Means is there any chance to extract x and y coordinates of 'snapped outlet' and feed as an input to 'upslope area' within in a single model. I have tried two methods to do so one is using expression of 'pre-calculated value' for 'target X coordinate' and another by editing python script of the model. But failed in both attempts.

[@HansvanderKwast]

That's not possible. We can only do that with Python. Check the PCRaster Tools plugin playlist for more integrated tools.

[@janaa5074]

hoe to delineate Sub basins?

[@HansvanderKwast]

If you have the outlets of the subcatchments you can use this video: kzbin.info/www/bejne/fqLGkGR5gsaXnqM

[@immoll]

I am struggling to be able to view the SAGA tool within my toolbox. I've activated it but its not appearing anywhere. Does anyone know how to fix this?

[@HansvanderKwast]

First you need to check if you use the LTR version. Here's a video that explains the difference between the newest version and the LTR: kzbin.info/www/bejne/fHfJZJKGa5Jnd8k Then if the Processing Toolbox is still missing after installation you can try in this order: 1. Activate processing toolbox from the plugins menu 2. If that doesn't work, start a clean profile: settings -> profiles -> new profile. That will give you a clean QGIS. 3. If that doesn't work go to the OSGeo4W shell and type setup. Then go to Advanced Desktop installation and run the updates. Make sure the LTR, GRASS and SAGA are installed.

[@immoll]

@@HansvanderKwast Thank you!