page_title: Lake Copais
section_title: Drainage
hierarchical_section_title: Lake Copais / Drainage
caption_attribution_description: English: Dredger built for the Lake Copais Company by Hunter &amp; English of Bow, London
context_page_description: Lake Copais, also spelled Kopais or Kopaida, was a lake in the centre of Boeotia, Greece, west of Thebes. It was drained in the late 19th century. The area where it was located, though now a plain, is still known as Kopaida. A one-time island in the lake was modified in ancient times into a megalithic citadel, now called Gla, though its ancient name is not known. It may be the city of Arne mentioned by Homer.
context_section_description: When the lake existed, the towns of Haliartus, Orchomenus, and Chaeronea were on its shores. Rivers feeding the lake included the Cephissus, Termessus and Triton. The lake was (and is) surrounded by fertile land, but the lake increasingly encroached on the surrounding land because of inadequate drainage. In response to this, in 1867–1887 Scots and French engineers reclaimed the land for the British Lake Copais Company, by building channels to drain water from the lake to the Cephissus and from there to Lake Yliki (Ylíki Limní, ancient Hylica). In total about 200 square kilometres (77 sq mi) were reclaimed. This land was returned to the Greek government in 1952.
  The Kopais Lake Agency was created in 1957 to supervise the draining of the lake and building of a new road. The task was completed that same year, but the agency with full-time staff of 30 (including a driver for the president of the agency) still existed until 2010.
  Before this the lake drained into the sea by numerous subterranean channels. Some of these channels were artificial, as the 1st century geographer Strabo recorded. Modern excavation has found enormous channels dug in the 14th century BC which drained water into the sea to the northeast; Strabo mentions work being done on these channels by an engineer named Crates of Chalcis in the time of Alexander the Great.
caption: British-built Lake Copais Company dredger at work
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