The best version of off-grid micro-hydro I’ve seen on YouTubes is where someone uses the pump on a discarded washing machine to create 12VDC to charge a bank of batteries. I would have to search for it
You may be a little disappointed with it’s performance as a water turbine. I have a water turbine but I need to gear it up (or belt it up) to about 600 rpm to get the generator functioning. This high speed can not be achieved in the water stream due to cavitation and other resistances… and a word of caution… the critters that contact with the moving parts don’t fare too well.