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.
Water storage
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Water storage is a broad term referring to storage of both potable water for consumption, and non potable water for use in agriculture. In both developing countries and some developed countries found in tropical climates, there is a need to store potable drinking water during the dry season. In agriculture water storage, water is stored for later use in natural water sources, such as groundwater aquifers, soil water, natural wetlands, and small artificial ponds, tanks and reservoirs behind major dams. Storing water invites a host of potential issues regardless of that water's intended purpose, including contamination through organic and inorganic means.
Great Nile Dam, at first cataract, Egypt, 1908, Copyright, 1908, by Stereo-Travel Co. Brooklyn Museum Archives
Wetlands in Donana National Park (Huelva, Spain)
The Hoover Dam
Nyalual Deng Joak carries a distribution of buckets back to her community. As well as constructing latrines and conducting health campaigns, Oxfam provides essential materials such as buckets, soap and mosquito nets that help people store water safely and protect family members from fatal illness.