I love these:
Whirlpool Turbines Can Provide 24/7 Renewable Energy For Dozens Of Homes (3:15) ~ Tech Insider, 2018-02-09

I like this "OpenSourceLowTech" channel:
The $50 Water Turbine -DIY, Portable, Powerful, and Open Source (7:45) ~ OpenSourceLowTech, 2019-12-03

• https://OpenSourceLowTech.org

Another good "MrHydrohead" channel (providing versions of all 18 parts with and without music):
Part 18 MicroHydro Power System in CO (7:54) ~ MrHydrohead, 2017-10-07

From a channel almost completely unrelated:
Archimedes Hydropower Screw Generator (2:26) ~ Sign Monkey, 2016-12-27

Our Hydroelectric Power (7:36) ~ RaspberryIsland, 2019-02-07

Imagine if many rivers and streams big and small were lined with big and small versions of these...
Ultra-Small Water Power Generator (4:41) ~ JVT-en, 2019-05-14

Vertical turbine hydro generator system. Low rpm permanent magnet generator, home madel (10:22) ~ markp0177, 2014-01-08

Water Generator Running Off Grid Cabin (13:44) ~ luke Fugate, 2019-03-29

Janky but effective:
Free Power for 16 years from a modified Washing Machine / Water Wheel (13:16) ~ Marty T, 2020-05-10

Homemade Hydro Electric Station! Alternative energy! Free Electricity! Autonomous energy (4:41) ~ KREOSAN English, 2018-06-08

One of many similar designs for camping, Luddites, or third world:
Energy to go: the world’s smallest hydropower plant | Eco-at-Africa (13:16) ~ DW News, 2017-03-09

https://duckduckgo.com/?q=Micro-HydroPower

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