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40d:Water wheel
A water wheel is a machine component that provides power via water flow, constructed at a carpenter's workshop. It requires 4 wood and generates 100 power, which can be used for operating a pump or mill. Use axles and gears to access the power produced by a water wheel.
Construction
A channel 3 tiles long should be built above the water flow where you plan on putting the wheel. An axle can then be built perpendicular to this. Once the axle is complete, you can place you wheel. Power won't be generated until the water level is at least 3. Once this is done, you can transport the power to wherever it is needed.
Perpetual motion
Due to the low power draw of a screw pump, a self-powering assembly can be made with a water wheel that still leaves plenty of excess power for other uses. This is probably a bug.v0.27.169.33a
A simple design is available at this forum post.