This free and open source turbine can be built for half the cost of a 120 watt solar panel, and will produce about ten times the power (5kWh with 3m drop and 35 l/s flow) per day. It can be plugged into any appropriate waterway without the need for earthworks, and uses only basic off the shelf and recycled materials, and simple hand tools.
This is a siphon action pico water turbine which uses water momentum to drive an alternator/generator for producing electricity, or air and water pumps for cooling, irrigation and similar.
The turbine is made entirely from easily sourced off the shelf materials, and should cost about $30-$50 for the unit itself, plus however much pipe you need to attach to take full advantage off your watercourse.
The turbine can be fabricated by one person in 1-2 days with basic hand tools (mostly just a drill) and should produce 200 watts at about 60VDC(rectified) x 3.3A with a 3 meter drop and 30-40 litres per second flow. This will of course vary according to local site specifics, material dimensions, and overall setup.