How can I find the volume of a reservoir or lake from a DEM? In this video we will calculate the elevationareastorage 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 elevationvolume relationship below the SRTM30 water mask, and then combine the two data sets together in Excel. I will take you stepbystep through all the processing from the DEM to the final elevation areastorage 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 ElevationAreaVolume
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:
QGIS shape files & Reservoir DEM: https://bit.ly/3Lc70Ws
EXCEL data & calculations: https://bit.ly/3unSTaz
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Some useful links:
Link to the 2007 USGS report on the Kajaki reservoir: https://pubs.usgs.gov/sir/2007/5148/p...
Link to video on Reservoir ElevationAreaStorage Capacity Curves in Excel:    • Excel: How to add a 2nd Axis to a Cha...  
For more QGIS videos see the QGIS playlist:    • QGIS 101  

Images used under Creative Commons License
Bathymetric survey
Australian Government Australian Transport Safety Bureau, CC BY 4.0 https://creativecommons.org/licenses/..., via Wikimedia Commons
Source: https://upload.wikimedia.org/wikipedi...



#QGIS #VolumefromDEM #Reservoirs