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== Mechanical power ==
Prior to the widespread availability of commercial electric power, simple mechanical power was produced and used for [[irrigation]], and operation of various machines, such as [[watermills]], textile machines, sawmills, dock cranes, and domestic lifts.
Some of the work that it has been known to do is saw lumber, and grind grain. The water is usually transferred through a variety of ways; shafts, pulleys, wheels,cables and gears. Hydropower dates back to the Greeks who used vertical axis water wheels as early as 85 BC and horizontal axis wheels from 15 BC. The hydropower was the only source besides wind power to do useful work until the steam engine came along in the early 19th century.
==Small hydropower plants==
===parameters for the determination of a project===
===Vocabulary and definitions===