Does anyone here know how to go about generating power from a stream? We have a stream that runs most of the year, occasional dry times in the summer when it flows underground so animals still get to drink from the remaining pools but no useful flow. This time of year when I'm really low on solar power it's flowing at 100 liters per second. I have several places with over a meter drop so a small wheel could be possible, I don't want to make to much of a weir and stop wildlife moving up stream. Or I could pipe water and run through a small turbine and back to the stream if I didn't draw to much from the flow. All I need is power to charge tool batteries run some low power lighting intermittently and maybe a small fan so 250W plus would be OK 500W and I'd have more than I know what to do with. I want the power about 50m from the stream but if necessary could build a battery charging box and just swap batteries between there and the barn as needed. Budget is even lower than the power requirement it's a small holding not half a county.