Parting posture

The title of this article is ambiguous. For the sculpture of the same name on the apex posture of the Main-Danube Canal, see apex posture (sculpture) .

Elevation profile of the Canal du Midi in meters. The height of the Étang de Thau is set to zero. The distance from Toulouse (1) is given in meters. (2) Crown posture, (3) Castelnaudary , (4) Carcassonne , (5) Trèbes , (6) Béziers , (7) Agde , (8) Étang de Thau

The highest section of a navigable canal between - as a rule - two adjacent canal levels ( locks or ship lifts ) is referred to as vertex support .

Since the lock by use and leaks in the locks the water from the summit level in the lower-lying postures flows, must be a channel in the region of this highest portion of the water supplied. In modern canals such as the Main-Danube Canal , the apex is supplied with water by pumping stations and reservoirs.

In older canal constructions, water was fed to the canal through guide ditches . This turned out to be problematic especially for canals in arid areas and with a comparatively high elevation ( Ludwig-Donau-Main Canal , Canal de la Marne au Rhin ) and occasionally led to these canals not being used or only to a limited extent in dry summers could.

If there is a large elevation in the area of ​​the apex that can only be traversed with an incision or crossed with the help of additional locks with disproportionate effort, the construction of a canal tunnel , which then also becomes a vertex tunnel (e.g. Tunnel de Mauvages on the Canal de la Marne au Rhin) is often a practical solution.

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  The mouth of the Rigole de la plaine guide ditch in the apex of the Canal du Midi (site of the original Écluse de la Méditerranée)

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  The apex of the Canal de la Marne au Rhin with the Tunnel de Mauvages

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  The apex of the Oder-Havel Canal extends from the headwater of the Lehnitz lock to the Niederfinow ship lift

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  The apex of the Main-Danube Canal east of Hilpoltstein

Web links

• The Westphalian shipping canals under oro-hydrographic aspects (article)

literature

• Philippe Calas: Tout savoir sur le Canal du Midi . Éditions Grand Sud, Albi 2007, ISBN 978-2-908778-61-8 , pp. 65 f .

Individual evidence

1. ↑ Vertex posture at baulexikon.beuth.de, accessed on March 6, 2019
2. ^ Negotiations of the Historical Association for Upper Palatinate and Regensburg, Volumes 17-19, p. 63 at Google Books, accessed on March 6, 2019