Reservoirs

thumb|Kardzhali Reservoir|Kardzali Reservoir in [[Bulgaria is a reservoir in the Rhodope Mountains. |alt=]] thumb|Some reservoirs such as this in Argos, Peloponnese are made for recreational purposes, rather than storing [[fresh water.]]

thumb|Portuguese Cistern (Mazagan)|Portuguese cistern (Mazagan), [[El Jadida, Morocco (1514)]] thumb|The difference between a cistern and a well is in the source of the water: A cistern collects [[fresh water where a well draws from groundwater.]]

plastic balls used in resevoirs for environmental protection and reduce evaporation

thumb|Armon Knossos P1050995 A kouloura, or kouloures (Greek plural koulourai), is a circular subsurface pit with stone walls found in certain settlements within Ancient Crete, including the Minoan palaces at Phaistos, Knossos, and Malia. According to the stratigraphy, the kouloura were all constructed around MM II (1850–1750 BC).

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every type of water storage, drinkable or not