Deriving River Network & Catchments from a DEM using QGIS

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.

[adambuller]

This was so comprehensive and excellent. Preparing my thesis now and the software i tried to use to delineate my catchments wasn't working properly. This saved me. Cheers

[wordsfromhills]

I am using Qgis 3.16 and the saga tool box does not work when I try to use channel network and drainage. Is there any solution

[hemantk.vaishnav]

Sir, After run strahler order it is not showing drainage network .It shows lots of pixels in B&W.. Plz suggest. I followed all steps properly

[jimilustukan]

The following layers were not correctly generated.
• D:/Anak Kampus/Teknik Sipil Undana/fill sinks (wang & liu)/area.sdat
You can check the 'Log Messages Panel' in QGIS main window to find more information about the execution of the algorithm.
Why ? Help me

[bijiliparasa]

hi, your explanation was too good, thank you for giving this video. but in current version of qgis there is no option for starhler order option. please tell me how to overcome this issue. thank you.

[AliAhmed-zqkm]

thanks alot for this tutorial
i hafe a problem in getting the catchment area it can apear with me and give me a massage say the following layers were not generated.

[AK-mevb]

When I apply the fill_sinks function, nothing changes in my data set. It has the same values as the DEM before. As soon as I apply the Strahler-tool, I get only a diffuse image (with 12 Strahler-classes) and no flow lines even after filtering for exclusively higher Strahler-orders (Strahler-order >=9). What can be the reason for this?

[modellazioneidraulicagis]

Dear all, when I use Upslope Area and Run why try a error "SAGA Version: 7.8.2 (64 bit) Error: tool needs graphical user interface [Upslope Area]" and dont create basin? Thanks

[muhammadsyah]

I can't do upslope. it says "The following layers were not correctly generated.". Does anyone have the solution to my problem?

[shientoh]

hi, may i know which website this DEM was downloaded from? I am trying to obtain a high res DEM of Singapore! Thank you!

[reshmaantony]

Excellent tutorial. Explained in a simple manner.

[orzuodinaev]

Dear sir, I did all the steps until the polygon clipping, when I run the process, the next error comes out "The following layers were not correctly can check the 'Log Messages Panel' in QGIS main window to find more information about the execution of the algorithm.". Can you help me pls!

[Oldmoney.]

Which Qgis version and saga version do you use ?

[ugandhara]

Sir after running reprojected dem.. Its showing "The following layers were not generated properly".. Not able to generate Filled DEM layer.. Kindly help

[n]

order 8 stream i.e. main river isn't coming after deriving channels under SAGA tool 'channel network and drainage basin'. What could be the reason. Thanks

[hurairairfan]

hi, I find your tutorials very helpful however my upslope saga tool is constantly giving error and isn't working, can you help me out with it.

[mriduleshtiwari]

i am getting error in stahler order
The following layers were not correctly can check the 'Log Messages Panel' in QGIS main window to find more information about the execution of the algorithm.

[njengnapoleonngenge]

Thank you for your very powerful, and well simplified and articulated demonstrations. It always saves some of us out here. Please could you do something on how to generate knickpoints in ArcMap for us? I really need to generate Knickpoints for my studies but i am unable to do it, and I cannot also lay my hands on any YouTube video to lead me through the process. Thank you

[MurtadhaMenekher]

Thank you so much for all your videos, May I know the algorithm for applying this technique, please?

[lizzelmakokha]

Hello Sir. I am stuck. After Running my Upslope area my watershed has not been delineated. Kindly Help