Deriving River Network & Catchments from a DEM using QGIS

[@adambuller4562]

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

[@geodeltalabs]

Glad you liked it!

[@reshmaantony6435]

Excellent tutorial. Explained in a simple manner.

[@giliais307]

Thank you, you just help me through by following exactly what you do here. I always come back to you whenever I forgot something he he...I even bookmarked this video.

[@dctr5534]

This tutorial is excellent. I also appreciate your overview on stream orders 👏🏼

[@geodeltalabs]

Glad it was helpful!

[@osmankoroma6495]

Thank you for the lecture. May God bless you.

[@gladysjoy7121]

thank you, I like how you explained in an easiest way🙂

[@geodeltalabs]

You are welcome 🙂

[@shivimridula7486]

Please help m, my fill sink is showing error

[@HungLingLim]

wow. West Malaysia. nice to have tutorial from Malaysia :D

[@geospatialsurvey6109]

Thank you very much. This is a very useful tip for deriving catchment area using QGIS. I'm excited to try this one.

[@geodeltalabs]

You are welcome 🙂

[@sathyanathanr717]

Thanks a lot. Your explanations of each step were very precise.

[@SnootyFarkleboob]

This is exactly what I needed! Thank you so much for this, it's saved my life! 😊❤❤

[@shivimridula7486]

Can u help me, my fill sink is not working, keep showing errors

[@avinashramessur5747]

Thanks a lot, very pedagogical and easy to understand

[@geodeltalabs]

Glad it was helpful!

[@peterchin6759]

Thank you very much for your crystal clear explanation.

[@geodeltalabs]

You are welcome :)

[@BasinikondaTrek]

Fantastic tutorial, hats off !!

[@tanushkareddy108]

An amazing video - so informative and descriptive. Thank you

[@rajitadas]

Well explained.. Thank you so much, I have been wanting this for so many days

[@geodeltalabs]

Glad you found us! :)

[@sarahbenzai5358]

very clear and useful! thank you

[@deepakgowda89]

Great Work! Salutations to your way of explanation. Thanks

[@evanslion3548]

Your videos are very helpful. Thanks

[@ANANTHUVDev]

thanks for the wonderful tutorial sir.

[@dr.mohanvasave3050]

Dear sir Excellent demonstration Please next video uploaded the Marphometric Analysis using QGIS ,,( Areal, Linner and Relief Aspect)

[@mugishaadam933]

This was so informative

[@veyselyazici]

Great tutorial. Much appreciated. Kindest regards.

[@geodeltalabs]

You are welcome :)

[@Rahul-dq4lk]

Thank you so much 🙏

[@anggapranata9619]

Thank you sir. So helpful

[@yeshisingye5089]

Powerful tutorial

[@rifkypasopati2807]

So comprehensive and excellent. My college task is as the same as this video, very useful, thank you so much. i likely to give you like and subscribe

[@geodeltalabs]

Great 👍😃

[@yoshuareece8785]

Fantastic tutorial

[@geodeltalabs]

Thank you! Cheers!

[@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.

[@daniellepacker2920]

You have been extremely helpful! Thank you

[@geodeltalabs]

Glad you liked it!

[@diggi3247]

Very helpful... Thank you kindly

[@geodeltalabs]

You are welcome

[@ericbriones6580]

Great video. Thanks!

[@piusnnwachukwu3411]

Thank you for this.

[@eugeniocondello6175]

Very Good, Thank you , great job!!!

[@FollowPlayer]

Nice. Thank you.

[@trollenz]

Excellent ! Thanks.

[@geodeltalabs]

You are welcome :)

[@njengnapoleonngenge1753]

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 KZbin video to lead me through the process. Thank you

[@sureshkotwal656]

Sir wonderful video thanks

[@Chamchijjige]

Thank you very much sir.

[@geodeltalabs]

You are welcome!

[@nuclearant9523]

Great video, clear and neat!

[@lmthunzi]

Really good stuff. I just subscribed 😊❤

[@geodeltalabs]

Welcome!!

[@KikelPryoHandoko]

Man, thanks for usefull tutorial. 👍

[@kateflower300]

Thank you! ❤😊

[@adarshdalavi659]

Great tutorial ,very helpful

[@Bartzeta]

Thank you so much :)

[@kurtwogau1076]

Thank you!

[@jimilustukan5362]

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

[@JackyVSO]

I'm also having this issue. Did you find a solution?

[@mriduleshtiwari597]

i am getting error in stahler order The following layers were not correctly generated.C:/Users/harshit/Desktop/major project/Final/strah.sdatYou can check the 'Log Messages Panel' in QGIS main window to find more information about the execution of the algorithm.

[@GeoScreen]

Quite educative, bless up

[@geodeltalabs]

You are welcome

[@GeoScreen]

@@geodeltalabs Thanks.

[@biplabbiswas8877]

EXCELLENT!!!

[@durgakc9967]

It's AWESOME

[@faizanmasoodi6246]

Brother can you also do a video on potential zones for Rainwater harvesting or ground water potential zones.

[@muasabrian7565]

Its a nice video, very informative although unfortunately my DEM didn't produce the strahler order.Just watched the rest...Thank you.

[@geodeltalabs]

Sorry to hear that. Did you try using a different DEM? you can download for free from USGS. Have a look at the following tutorial- kzbin.info/www/bejne/r4q6lat7rcaVftE

[@ewanharris5433]

Excellent Thx

[@glowworm1]

Very informative. :)

[@MurtadhaMenekher]

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

[@roseavery8449]

this is very cool!

[@gferrigno2268]

GG, BROOOO, THANKS UUUUUU

[@mosesperianaiagam823]

Thanks bro

[@geodeltalabs]

You are welcome :)

[@cristinacovataru7918]

Amazing :) thank you ^-^

[@geodeltalabs]

You are welcome :)

[@suryahafizh5498]

thanks you very mouch

[@منوعاتعالمية-ي8ش]

Thank you

[@geodeltalabs]

You're welcome

[@hemantk.vaishnav9345]

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

[@balpreetkaur6509]

I am getting the same pixelated DEM. Looking for a solution to it.

[@orcafourone]

Same problem

[@AliAhmed-zq8km]

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.

[@kyawzayertint1255]

Thanks

[@geodeltalabs]

You are welcome ☺️

[@DantonJohannes]

excellent

[@geodeltalabs]

Thanks!

[@raghukambaiah7031]

Thanks for the wonderful video uploaded. Is it possible to derive multiple sub watersheds in qgis? If so please give instructions on the same....

[@sbkarki1]

very nice

[@sug994]

great tutorial. How to fix th error saying "layers were not generated correctly" in the Fill sink execution? thanks

[@Vanshika-vlogss]

my god!!!! your voice

[@AK-me3vb]

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

[@coopernik]

I tried to upscale the skills you teach to a bigger basin. It took hours for the algorithms to finish 😂

[@geodeltalabs]

Yes, the pocessing times can significantly increase when delineating a large area and/or when using a high resolution DEM

[@ugandhara12]

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

[@rojalinpriyadarshini2277]

Sir, kindly help me in determining the longest stream among the channel network in a catchment area.

[@ata1088]

Very clear explanation, thank you. If heavy rain falls, can we predict the possible flooded area by this method? I think we should also look at satellite images to detect flooded areas from the past in order to be sure. Do you suggest more?

[@geodeltalabs]

Hi, a great question! To do a more realistic and an accurate simulation of the flooded area, you will have to use some hydrodynamic simulation tools, particularly for simulating river floods. You can use what we have discussed in this tutorial to, let's say, derive the corresponding catchment which can be used in a hydrological model to simulate the discharge from that catchment under design rainfall conditions (since your interest is in simulating floods). Once you do this, you can use the simulated discharge from the hydrological model as an inflow boundary condition to a hydrodynamic model which can actually simulate the water level of the river along the river stretch which you are interested to see whether it floods or otherwise. If you use a 1D hydrodynamic model like MIKE 11, you will only be able to simulate the water level along the river banks, and by seeing how high the water level rises over the banks, you might be able to get an idea of the stretches of the river which can actually flood under the given inflow boundaries. However, if you want let the flood water move into the flood plain, you will have to use a 2D hydrodynamic model such as MIKE 21 + MIKE 11 or HEC-RAS (recent versions) to see how much of an inundation happens in the adjacent flood plains. And yes, you may use satellite images to sort of validate your hydrodynamic models by checking whether the model is able to simulate the flood extents as closely as possible to the real historical floods :)

[@ata1088]

@@geodeltalabs Thank you very much. That is really helpful :)

[@akshaydahiwale8776]

how to calculate how many number of 6th order streams are present in basin?

[@biplabbiswas8877]

Can we do Stream Ordering here and also a couple of exercises like Drainage Density, Ruggedness Index etc. Thanks

[@Oldmoney.777]

Which Qgis version and saga version do you use ?

[@nathanmwasembe6278]

Great Tutorial, I came across an error while running the Strahler Order input 'The following layers were not correctly generated. • C:/Users/User/Desktop/BLAH/Tasarim/kayabasi 2/STRAHLER_ORDER.sdat You can check the 'Log Messages Panel' in QGIS main window to find more information about the execution of the algorithm. ' How do I solve this problem? Your help will be greatly appreciated.

[@aadityarajbhattarai46]

dont put space in path. your kauabasi 2 folder has a gap

[@hurairairfan5658]

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.

[@monitoring_evaluation]

Thank you for the wonderful tutorial. I'm using QGIS Desktop 3.26.3. Please why is it that when I lunch a SAGA tool, I get this Message: SAGA version 7.8.2 is not officially supported - algorithms may encounter issues. Also, SAGA tools do not work well. Please how can I resolve this issue?

[@udeshwijepala6915]

Hi, did you get any solutions for this? I also getting this warning.

[@julitofatima6575]

❤❤❤❤

[@geodeltalabs]

(Y)

[@reshmaantony6435]

Sir, I need a clarification on using filled DEM . Can we use filled DEM as the input for hydrologic modelling in models like HECRAS for the preparation of terrain?

[@geodeltalabs]

Hi, yes, it should not be a problem.

[@Rahul-dq4lk]

How to download or find the Digital Elevation Model of any location? Please help

[@Nothingimportant1]

Can I ask what machine specification you use with such a speed? In my case, I am using a very strong machine, with 32 GB Ram but still takes time like one to two mins to complete the tasks. Thank you for your work as well.

[@dr.swatipatil-gulavane8759]

Pls share how to delineate first order second order river network

[@mothanaahmad6173]

Can use it to discover water ground and depth

[@marintothebush]

Hi, thank you again for another great video. I do have a similar problem than with Troy Nguyen but with the next step - the upslope tool. "Error: tool needs graphical user interface [Upslope Area]" (...) The layer were not generated properly. How do we make sure that SAGA 7.8.2 is supported on QGIS please? It looks like that might be the issue. Thank you!

[@ahmad-arrafi6711]

I am facing the same problem man

[@robertbachmann1573]

Check out: kzbin.info/www/bejne/ql6Vdqulrs18nKM&ab_channel=HansvanderKwast & gis.stackexchange.com/questions/407307/upslope-area-shows-an-error-stating-tool-needs-graphical-user-interface.

[@anggapranata9619]

@@robertbachmann1573 Thanks for the link

[@n762]

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

[@benjaminndobetarkang7982]

Thanks so much but how can I isolate the catchment area

[@nedsonkaunda5927]

This is really great video_But now how do you get the catchment area for hydrological studies ?

[@geodeltalabs]

After you generate the polygon, you can open up the attribute table, go to field calculator, and add a new field for area and perform a geometry calculation to get the area. Make sure it's all in a projected CRS.

[@nedsonkaunda5927]

Thanks Eng.

[@muhammadsyah3938]

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

[@muhammadfaour3211]

yes same here

[@orcafourone]

When I use the Raster Calculator and select the Strahler Order to Greater than or Equal to 5, I just get pixelated nonsense at the end of it. I'm doing exactly what you're doing but it comes out all weird. Any idea why that might be?

[@orzuodinaev3067]

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 generated.C:\Users\4BEC~1\AppData\Local\Temp/processing_c01f9474fa7a46379b398a946e7c0e36/c38651f8b05448a9bb716228107b6a2e/S_OUTPUT.shpYou 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!

[@sachinshrestha708]

Everything that you said worked smoothly till the upslope area from saga. It shows an error: tool needs graphical user interface. The layer was not correctly generated. Check 'log messages panel' to find more info. Sir can you please say what the solution to this problem can possibly be.

[@danieldoucelin8485]

Hi, did you find a solution ? I'm facing the same issue. Regards, Daniel

[@shhtoo7157]

Hello When I input data in Upslope area box and run, there is a error showing with missing parameters. So how can I fix this issue. If possible please explain for me. Thanks a lot for your very informative tutorial.

[@SuperDanisse]

I'm wondering which is the difference between using the reproject feature or simply exporting the layer in a different coordinate system?

[@fengfan3996]

when you export the layer in a different coordinate system you can't choose the method. with the warp function, you can choose the resampling methods

[@jamala.j.588]

Is there any reason why you choose Sungai Pahang tributary for this tutorial?

[@george5401]

Amazing tutorial. I have encountered a problem when I try to run my polygon clipping. It says 'wrong or missing parameter values'. What could be causing this?

[@geodeltalabs]

1. Could be an issue with projections. Make sure the raster that you are trying to clip, and the polygon which defines the clipping boundary are both in the same coordinate reference system 2. Sometimes, its worth trying out tools from different providers to achieve the same functionality (such as clipping in this case) to see if any other algorithms work even though your first choice end up failing. For example, for clipping, there are different algorithms that you can try out provided by GDAL/ SAGA etc., which you can access simply by typing 'Clip' in the search box of processing toolbox.

[@dumptruckmotorcade]

Could you provide a little more detail about the need to warp the projection at the beginning of the project? I tried the same and got crazy output when running the fill (I was using SRTM for Idaho-Wyoming)