Siphon
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A siphon is any of a wide variety of devices that involve the flow of liquids through tubes. In a narrower sense, the word refers particularly to a tube in an inverted "U" shape, which causes a liquid to flow upward, above the surface of a reservoir, with no pump, but powered by the fall of the liquid as it flows down the tube under the pull of gravity, then discharging at a level lower than the surface of the reservoir from which it came.
Siphoning the beer after a first fermentation
Siphon irrigation of cotton at St George, Queensland.
A siphon used for homebrewing beer
Water seal under a sink. Inverted siphoning occurs below the line "A".
Reservoir
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A reservoir is an enlarged lake behind a dam, usually built to store fresh water, often doubling for hydroelectric power generation.
Kardzali Reservoir in Bulgaria is a reservoir in the Rhodope Mountains.
Lake Osceola on campus of the University of Miami in Coral Gables, Florida, May 2006
Some reservoirs such as this in Argos, Peloponnese are made for recreational purposes, rather than storing fresh water.
Lake Vyrnwy Reservoir. The dam spans the Vyrnwy Valley and was the first large stone dam built in the United Kingdom.