Does anyone have a suggestion for how to do a hydro-power demonstration?

Question

for my final project in high school i have to do a presentation on hydropower which needs to be 20 minutes long. i have a slide show and also a poster. but that's still doesn't fill the 20 minutes. so i was thinking of doing a demonstration of how a hydropower plant works and then i realized i didn't know where to begin. i tried looking on different websites but i couldn't find anything. so i'm hoping you can help me. or if you have any other suggestions that you think will help please let me know.

Answer 1

In addition to the powerpoint presentation, you could demonstrate how a hydropower generator works by building a simple generator out of a kleenex box, wire, nail,  and a small magnet - instructions at the first link.

Also, don't forget to to cover the ecological effects of hydropower on fish ( second link):