Did you know that the amount of water lost to evaporation from all the reservoirs in the world is estimated to be greater that the total global domestic and industrial water demand?

So why is this important loss of water from reservoirs not addressed more often in river basin plans, or the costbenefit analysis for new dams? The main reason is that it is difficult to accurately calculate the evaporation rate from a reservoir. You need access to advanced meteorological data that can be expensive and difficult to collect.

In today’s video I’m going to show you how to estimate evaporation losses from a reservoir using free remote sensing data. We’ll use the Kajaki Reservoir in Afghanistan as an example, and compare our results to the hydrological modelling work done by the USGS.

Chapters
00:00 Introduction
00:39 Content of the video
01:18 Reservoir water balance
02:12 CHIRPS precipitation (Climate Engine)
02:53 MODIS MOD16 PET (AppEEARS)
03:40 Calculate Net Evaporation
05:30 Comparison with USGS study
06:18 Calculate evaporation volume
10:01 What does 91 MCM look like?
10:45 Economic impact of evaporation losses
13:12 Conclusions
13:36 Final words

Disclaimer: This video is based on open source data & the purpose is to train you how to use Excel for water resources investigations. 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 EXCEL data & calculations: https://bit.ly/3Nbn8rt
Link to PPT presentation: https://bit.ly/3wggQ2O
Link to CHIRPS precipitation video:    • Climate Engine: Download FREE Daily C...  
Link to: MODIS Evapotranspiration video:    • Evapotranspiration: Download FREE dai...  
Link to Reservoir Storage Monitoring video:    • Excel: Reservoir Storage Monitoring f...  
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Some useful links:
The Global Water Monitor for Lakes & Reservoirs: https://blueice.gsfc.nasa.gov/gwm/lak...
Video on Reservoir volumes from DEM:    • QGIS: Reservoir volume from DEM  Kaj...  
Video on Reservoir ElevationAreaStorage Capacity Curves in Excel:    • Excel: How to add a 2nd Axis to a Cha...  
Link to the 2007 USGS report on the Kajaki reservoir: https://pubs.usgs.gov/sir/2007/5148/p...

#Evaporation #Reservoir #WaterBalance