Egg profile

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An egg profile describes the egg-shaped cross section of a sewer pipe , which describes a semicircle in the upper part and a parabola in the lower part . This narrow parabolic shape of the flow channel guarantees a sufficient flow rate even with a low flow volume , so that sediments carried along can settle less easily. This makes it easier to avoid blockages. With increasing flow volume, the larger cross-section of the semicircular profile can accommodate this larger amount of water, so that the flow rate does not increase to a destructive level.

The egg profile was developed by Joseph Bazalgette in the mid-19th century and used by him in the construction of London's first major sewer system from 1858. In continental Europe, the egg profile was used as early as 1845 when the Hamburg sewage system was built .

Egg profiles are mainly used in the inner-city operation of rainwater pipes with a variable input volume; they have been widespread since the beginning of the 20th century.

  • Hamburg sewer construction around 1845

  • Construction drawing for the London sewer system, 1854

  • Rainwater outlet as an egg profile

literature

  • Adolf Böhm: Sewage pipelines and pipe networks. Operation - renewal and maintenance, Vulkan Verlag, Essen 2001, ISBN 3-8027-2841-6 .
  • Rudolf Lautrich: The sewer. Verlag Wasser und Boden, 1964.
  • Willi Gujer: Urban water management . Springer Verlag, Berlin / Heidelberg 1999, ISBN 978-3-662-12992-0 .

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