QGIS: Reservoir volume from DEM - Kajaki Reservoir, Afghanistan

How can I find the volume of a reservoir or lake from a DEM? In this video we will calculate the elevation-area-storage capacity for the Kajaki reservoir, Afghanistan from the SRTM30 DEM. We will use data from a 2006 bathymetric survey, which used an arbitrary datum, to find the elevation-volume relationship below the SRTM30 water mask, and then combine the two data sets together in Excel. I will take you step-by-step through all the processing from the DEM to the final elevation area-storage capacity curves.

Chapters:
00:00 Introduction
02:13 Step 1: DEM to Equal Area Projection
03:45 Step 2: Create contour lines
04:19 Step 3: Select maximum flooded area
07:13 Step 4: Edit maximum contour line
15:11 Step 5: Contour line to polygon
16:00 Step 6: Extract reservoir DEM
17:11 Step 7: Calculate Elevation-Area-Volume
21:13 How to get the DEM below the SRTM water mask
22:14 Step 8: Excel processing
25:20 Final remarks

Disclaimer: This video is based on open source data & the purpose is to train you in QGIS & Excel. I am not responsible for what you do with this information/methodology. You need to check you own data, work and conclusions.

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Link to Kajaki reservoir data on Google Drive used for this video:
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Some useful links:

Images used under Creative Commons License
Bathymetric survey

#QGIS #VolumefromDEM #Reservoirs

[frenchcookerysnob]

As an engineering student specializing in hydrosystems management, your channel is the best thing that ever happened to me !

[woman_life_freedomiran]

I'm so glad that I got to know your channel!!!

[therealist]

Exactly what I was looking for. Thanks so much!

[Mallikbilugali]

Please do more videos on geology topics, we r waiting, loved ur explanation.

[Tom-ksxl]

This is Brilliant! Concerning the amount of repetitive commands it might be probably worth to either write a little plug in with python or so. That creates the table depending on z value. Maybe there is even already a plug in that we don't know

[atiqullahazad]

I am so glad to see your videos, but why you select Kajaki Dam for your working area?

[engahmadansari]

Thank you so much for the excellent work

[enashamed]

Thank you for this video .its amazing and very useful.i want to ask you if this method can be used for lakes upstream barrages in river reach or for dams only.

[africanahills]

Great video Mr. Andreas. Watching from Kigali, Rwanda. I am a dam engineer. Keep it up.
One Question: We are facing issues of measuring/estimating sedimentation levels/volume in our existing reservoirs such as the reservoir of Nyabarongo I hydropower project (location: -1.989096°, 29.633219°). Apart from Bathymetric survey, Any other method can you propose to us in the estimating sedimentation volume within a reservoir? Thx

[peterserey]

Thanks for sharing this wonderful work. I do have a question

Can we convert elevation-area-storage capacity into depth-area-storage capacity?

Please correct me if i am wrong.

I think this would be an elevation level ID 2 - an elevation level ID 1 and accumulate them all together to the rest.


Appreciate your through on this.

Thanks

[bibhorbista]

1) Is it ok that I got a different result than yours while calculating surface raster volume? Is it because the SRTM images that we import from the plugin are of different time?

2) What does 'count only below base level' mean?

[KKoKoRR]

3:11 You didn't change the CRS when save DEM. It is projected to ESRI 54034?

[Amadraniba]

This is great, how do i get the excel for this calcs?

[frankodoom]

please can i get the satellite imagery data of kajaki reservoir which is labeled, n32e065 1arc v3

[motivationalvideo]

How to get these file from where plz make video on that