Reservoir - online puzzles

Reservoir

A reservoir (; from French réservoir [ʁezɛʁvwaʁ]) is an enlarged lake behind a dam. Such a dam may be either artificial, built to store fresh water or it may be a natural formation.

Reservoirs can be created in a number of ways, including controlling a watercourse that drains an existing body of water, interrupting a watercourse to form an embayment within it, through excavation, or building any number of retaining walls or levees.

In other contexts, "reservoirs" may refer to storage spaces for various fluids; they may hold liquids or gases, including hydrocarbons. Tank reservoirs store these in ground-level, elevated, or buried tanks. Tank reservoirs for water are also called cisterns. Most underground reservoirs are used to store liquids, principally either water or petroleum.

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