How is energy harnessed from flowing water?

Answer 1

• You can build a dam with turbines and use the water moving through the turbines to generate electricity.
• You can install wave machines in the ocean to turn the movement of the waves into electricity.
• You can build barrages in tidal bays to take advantage of the movement of the tides to generate electricity.
• You can install turbines on the bed of fast-moving rivers and streams to generate electricity.
• You can build a watermill beside a stream or river and use the power of the moving water to turn millstones to grind grain into flour.

Answer 2

Basically you would have some device that transfers the rotational movement to an electric generator or equivalent.