ere are many thousands of years to produce mechanical energy. Mills, built along watercourses, were indeed with a paddle wheel driven by the current, powered a grindstone used to process the grain flour.
That the driving force of the water is sufficient to make a hydroelectric turbine turn, requires that the flow of the water is quite large and the height of fall is quite high. The rate is the volume of water flowing over a given period, usually a second. The drop height is the difference in elevation between a point upstream (water intake) and a point downstream (tailrace).More drop height, the greater the water goes down quickly and exerts force on the turbine. That's why we built retaining structures on some streams to increase the height of the fall thereof.
In Quebec, we use the driving force of water to produce a large part of the electricity we consume.
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