Pfinz relief canal

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Pfinz relief canal
Weir in the Hardtwald, on the right the branch of the Hirschkanal

Weir in the Hardtwald, on the right the branch of the Hirschkanal

Data
Water code DE : 237512
location Hard levels

Northern Upper Rhine Valley

City district Karlsruhe district of Karlsruhe

River system Rhine
Drain over Rhine  → North Sea
Branch from the Pfinz at the Hühnerlochwehr in Karlsruhe- Grötzingen
49 ° 0 ′ 27 ″  N , 8 ° 29 ′ 26 ″  E
Source height 120  m above sea level NHN
muzzle at Leopold port from the right in the Rhine at 371.2 km coordinates: 49 ° 6 '28 "  N , 8 ° 21' 43"  O 49 ° 6 '28 "  N , 8 ° 21' 43"  O
Mouth height 102  m above sea level NHN
Height difference 18 m
Bottom slope 1.2 ‰
length 15.6 km
Catchment area 10.654 km²
Navigable From the confluence of the Alb Canal
Pedestrian walkway as a lift bridge in the mouth area

Pedestrian walkway as a lift bridge in the mouth area

The Pfinz relief channel runs in the Upper Rhine Plain between Karlsruhe-Grötzingen and Leopoldshafen . The 15.6 km long canal directs flood of Pfinz the Rhine from.

Course and history

The canal was built as part of the Pfinz-Saalbach correction between 1934 and 1936. Most of the construction work was carried out by members of the Reich Labor Service .

The Pfinz relief channel branches off from the Pfinz at the Hühnerloch weir in Grötzingen . At Hagsfeld it is crossed under by the Pfinz and a little later by the Alte Bach in two culverts . The Hirschkanal , which runs north, branches off in the Hardtwald . In Eggenstein-Leopoldshafen , the water plunges into the basement and flows between flood dams to the Rhine.

A kilometer above the mouth of the Rhine flows the Pfinz-relief channel of the left and the Albkanal to. In the state water law for Baden-Württemberg, the mouth of the Pfinz relief canal is designated as navigable water. The channel serves as access for gravel Ships for Stretch smugglers sea . Two bridges in the estuary were built as bascule or lifting bridges in order to achieve the necessary clearance for ships.

When the canal was built, two polders were created: Flood water can be channeled from the Pfinz relief canal into the Füllbruch forest area , north of the canal between the Pfinz and federal motorway 5 . The retention area with a capacity of two million cubic meters drains into the Pfinz and was used, among other things, during a flood in December 1993. Another retention area with a capacity of 80,000 cubic meters was located in the Grosser Saubruch in the Hardtwald until the mid-1970s . It was abandoned by the city of Karlsruhe because of a nearby waterworks .

The Pfinz relief sewer can take in 60 cubic meters of water per second from the Hühnerloch weir in Grötzingen 145 and from the retention area in the filling quarry . At the chicken weir, the outflow in the Pfinz is limited to a maximum of five cubic meters per second.

The deep cut of the canal contributed to the lowering of the groundwater in the area of ​​the Pfinz-Saalbach correction. In order to avoid a further lowering of the groundwater, the Pfinz relief canal is dammed by several culture weirs. As a rule, the canal carries little water, so that, according to the landscape plan of the Karlsruhe neighborhood association, it resembles “more of a still water in the form of a chain of reservoirs than a flowing water ”. A nature guide published by the environmental agency of the city of Karlsruhe calls the Pfinz relief canal “a particularly extreme form of a natural flowing water”, which is characterized by a straight course, consistently regular cross-section, paved banks and lack of wood on the banks.

literature

  • Günther Malisius: Die Pfinz: Once a lifeline, now local recreation and always corrected . (= Contributions to the history of Durlach and the Pfinzgau , Volume 5). Freundeskreis Pfinzgaumuseum, Historical Association Durlach eV (Ed.). Regional culture publishing house, Ubstadt-Weiher 2011, ISBN 978-3-89735-681-8 .

Web links

Commons : Pfinz-Entlastungskanal  - collection of pictures, videos and audio files

Individual evidence

LUBW

Official online waterway map with a suitable section and the layers used here: Course and catchment area of ​​the Pfinz relief canal
General introduction without default settings and layers: State Institute for the Environment Baden-Württemberg (LUBW) ( notes )

  1. ↑ a b Height according to the contour line image on the topographic map background layer or the digital terrain model of the online waterway map.
  2. ↑ Length according to the waterway network layer ( AWGN ) .
  3. ↑ Catchment area according to the basic catchment area layer (AWGN) .

Other evidence

  1. ↑ Heinz Fischer: Geographical Land Survey: The natural spatial units on sheet 169 Rastatt. Federal Institute for Regional Studies, Bad Godesberg 1967. →  Online map (PDF; 4.4 MB)
  2. ↑ Water Act for Baden-Württemberg (WG) of December 3, 2013 .
  3. ↑ Gismar Eck: Pfinz-Saalbach-correction. In: Ministry of the Interior of Baden-Württemberg (Ed.): Water management in Baden-Württemberg. Water supply, sewage disposal, river engineering, dam construction, agricultural hydraulic engineering, administration, organization. Verwaltungs-Verlag, Munich 1969, pp. 153–156, here p. 155.
  4. ^ City of Karlsruhe: Adaptation to climate change. Inventory and strategy for the city of Karlsruhe. ( Memento of November 21, 2015 in the Internet Archive ) Karlsruhe 2013, p. 126 (pdf, 19.2 MB).
  5. ^ Karlsruhe neighborhood association: Landscape plan 2010. Explanatory report. ( Memento of May 26, 2012 in the Internet Archive ) (PDF, 7.2 MB, accessed on March 17, 2012), p. 2/14.
  6. ↑ Environmental Office of the City of Karlsruhe (ed.): Naturführer Bruchwald. Station 5 ( online ).