Lake Marathon or the Marathon Reservoir is a water supply reservoir formed from the construction of Marathon Dam at the junction of Charadros and Varnavas Torrents near the town of Marathon, in Greece. Since 1931 when the reservoir became operational was the primary the water supply facility for Athens until 1959 when water supply from Yliki Lake and Mornos Reservoir (operational since 1981) used, today is a backup source for water supply of Athens. The area of the lake at the height of the spilway of the dam is 2.45 square kilometres, the maximum deth is 54 m , the lake concetrates water from a watershed of 118 square kilometres with an average runoff of 14,400,000.0 m³ per year in an average rainfall of 580mm per year (standard deviation 135mm), the average inbound volume is 12,000,000.0 m³ per year and the maximum reservoir capacity is 41,000,000.0 m³ (effective volume 34,000,000.0 m³). The dam has a maximum height (from foundation to crest) 54m, maximum width 28m at base and 4.5 m at crest, length 285m , crest altimeter 227 m above sea level, toe altimeter 173 m above sea level (at lower point), the spilway is at 223 m above sea level and has a disgarge of 520 m³/s. The dam is costructed from concrete and is a gravity dam and is considered unique worldwide because of the external claddind of white pentelikon marble (the same marble used in constuction of the Parthenon and all the other buildings in the Acropolis. The dam constucted from the American firm ULEN (which had, in a BOT type contract, the ownership of water supply company of Athens until 1974) due to increased water supply needs from the rapid increasing of population of Athens from the huge influx of refugees from Asia Minor in after the end of Greek - Turkish war in 1922. The construction lasted from 1926 to 1929. See also EYDAP SA Athens Water Supply and Sewerage Company Marathon has multiple meanings Marathon (sport), an athletic event Marathon, Greece (and the Battle of Marathon), after which the sport was named Other places with the name in the United States Marathon (village), New York Marathon (town), New York Marathon, Texas Marathon, Florida Marathon, Ontario in Canada Until 1990, the... dam stands for dekametre. ... The Parthenon is the most famous surviving building of Ancient Greece and one of the most famous buildings in the world. ... This article refers to acropoleis in general. ... Bot may refer to: Internet bot: a type of computer program Larval Bot Kill Bot Bot, Tarragona: a small municipality in the comarca (county) of Terra Alta, Tarragona province, Catalonia, Spain video game Bot, see Zelda II: The Adventure of Link, small, bloblike creatures that jump about and have no...