[timeinput]

This isn't quite what you're after, but it's a pleasent read. https://ludens.cl/paradise/turbine/turbine.html there have been some discussions on here about it too.

It at least gets you all the right words to start googling for turbine options which helped me to do some back of the envelope math. It's a steeper hill than seemed feasible to me.

[ehnto]

Thid has reminded me of this gentleman who has been using gravity fed old washing machines as turbines for electricity generation on his property for 16 years https://youtu.be/Xb6TIWub6KU

He doesn't need the pumped storage part of the equation due to a natural water flow, but it is part of the solution at least.