I enjoyed this well made video illustrating how it works: https://www.youtube.com/watch?v=jh79YSCC8mM https://www.youtube.com/watch?v=jh79YSCC8mM And this one

I enjoyed this well made video illustrating how it works: https://www.youtube.com/watch?v=jh79YSCC8mM https://www.youtube.com/watch?v=jh79YSCC8mM And this one explaining how reservoirs can be used to trade-off water consumption for land requirements using side ponds: https://www.youtube.com/watch?v=SBvclVcesEE https://www.youtube.com/watch?v=SBvclVcesEE