Acher

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Acher
The Achertal valley in the northern Black Forest that opens up to the Upper Rhine Plain

The Achertal valley in the northern Black Forest that opens up to the Upper Rhine Plain

Data
Water code DE : 23572
location Northern Black Forest valley

Ortenau-Bühler foothills

Offenburg Rhine plain

Northern Upper Rhine Valley

Baden-Württemberg

River system Rhine
Drain over Rhine  → North Sea
source on the northeast flank of the Vogelskopf
48 ° 33 '47 "  N , 8 ° 13' 3"  E
Source height 841  m above sea level NHN
muzzle at Iffezheim in the Rhine Coordinates: 48 ° 50 '39 "  N , 8 ° 7' 6"  E 48 ° 50 '39 "  N , 8 ° 7' 6"  E
Mouth height 114  m above sea level NHN
Height difference 727 m
Bottom slope 14 ‰
length 53.6 km
Catchment area 335.263 km²
Discharge at the Kappelrodeck
A Eo gauge : 53.2 km²
Location: 43.2 km above the mouth 		MNQ
MQ
Mq
 MHQ
 400 l / s
2 m³ / s
37.6 l / (s km²)
 30.2 m³ / s
Left tributaries Gottschlägbach, Unterwasserbach, Fautenbach
Right tributaries Seebach, Grimmerswaldbach, Sulzbach (Laufbach), Sandbach (Bühlot)

The Acher is an approximately 54 km long orographically right tributary of the Rhine in the Ortenaukreis in Baden-Württemberg and in the Rastatt district , Germany . The Acher flows in a north-westerly direction from the Black Forest into the Rhine between the Rench , which runs south, and the Oos, which runs north .

geography

course

The headwaters of the Acher are located on the north-east slope of the Vogelskopf ( 1056.2  m above sea  level ), which is divided by Ice Age Karen . The source called Acherquelle lies at an altitude of 848  m above sea level. NN in the area of ​​the Ruhesteinlochs , which is named after the neighboring Ruhestein saddle between Vogelskopf and Seekopf ( 1054.9  m above sea level ).

The Acher initially flows northwards with a steep gradient. At the confluence of the Seebach, which comes down from the Mummelsee below the Hornisgrinde from the north, it turns its course to the west and flows through the trough-like widened valley area of Seebach . Here the valley between the Hornisgrinde and the Vogelskopf reaches a depth of around 550 meters.

In this part, the Acher is also called the Seebach , an indication that the side stream coming down from the Mummelsee used to be the main source of the Acher, despite its somewhat lower water flow.

Acher near Oberachern
Acherschöpfwerk at Greffern

Below Vorderseebach the Seebach joins the Grimmerswaldbach coming from the north . Here the Achertal jumps about one kilometer south to the confluence of the rugged Gottschläge valley with the Karlsruhe ridge and the waterfalls at the noble women grave above Ottenhöfen . From the underwater valley that flows into the south, the Acher strives in a north-westerly direction, flowing through the municipality of Kappelrodeck , towards the Upper Rhine Plain , which it reaches in Achern , the largest city in the northern Ortenau district .

In the Rhine plain, the course of the river is complicated by a variety of hydraulic engineering measures, in particular by the Acher-Rench correction between 1936 and 1967. While still in the Black Forest foothills , above Oberachern , the Achern Mühlbach is cut off at a weir from the Acher, which here has an average water flow of over 2 m³ / s. The Acher itself then crosses the urban area of ​​Achern. The Acher flood canal branches off below Achern, which can lead to the Rench flood canal and thus to the Rhine at up to 80 cubic meters per second during floods . Shortly before the division into Acher and Flutkanal, the Fautenbach meets the river from the left . The original course of the river, also channeled in parts, runs as the Acher (Feldbach) northwards via Gamshurst , Scherzheim and Lichtenau to Greffern . Here the river flowed into the Rhine until the Iffezheim barrage was built .

From Greffern, the Acher - now also referred to as the Rhine side ditch - runs largely parallel to the Rhine, the water level of which lies above the terrain level here. The Acher is used to connect the parts of the Söllingen / Greffern polder . In order to ensure that the Acher flows away even when the polder was flooded, a pumping station went into operation at Greffern in 2005 . On the inside of the Acher, the Rheinniederungskanal , which crosses under the Acher south of Greffern, runs. To the northeast of Greffern, the Acherner Mühlbach branch ( called Schwarzbach in the lower reaches ) flows into the Lower Rhine Canal. From Söllingen , the Lower Rhine Canal also runs through the Söllingen / Greffern polder. At Söllingen - crossing under the Rhine Low Canal and connected to the canal via a flood relief - the Sulzbach flows into the Acher as the lower reaches of the Sasbach . The Rhine Low Canal leaves the polder south of Hügelsheim ; the Acher flows through the outlet area of ​​the polder. The Sandbach flows into the Acher near Iffezheim . Most recently, bearing the local name Sandbach , the Acher flows around the Iffezheim barrage and flows into the Rhine from the right not far from the Wintersdorf Rhine bridge at Rhine kilometer 335.9.

Tributaries and branches

Acher

Feldbach

  • Rittgraben ( left ), 9.4 km
  • Michelfeldgraben ( right ), 31.6 km
  • Schwarzwasser ( right ), 6.1 km
  • Ditch Oberau ( left ), 0.8 km
  • Old retraction [GKZ 2357276] ( left ), 5.6 km
  • Altrheinarm Kirchhöfel ( left ), 2.7 km
  • Old retraction [GKZ 23572774] ( left ), 4.3 km

Rhine side ditch

  • Schlute Korbmachergrund-Ost ( right ), 3.2 km
  • Schlute Korbmachergrund-West ( right ), 1.0 km
  • Sasbach ( right ), 31.6 km
  • Ditch Erländer See ( right ), 0.9 km
  • Old retraction [GKZ 23572796] ( right ) 2.5 km
  • Rheinseitengraben ( left ), 1.1 km
  • Old retraction [GKZ 23572796] ( right )
  • Sandbach ( right ), 29.2 km

Landscape protection area

Under the name of Oberes Achertal , an area of ​​3,600 hectares around the communities of Ottenhöfen in the Black Forest and Seebach was designated as a landscape protection area by the Ortenaukreis district office . It bears the protected area number 3.17.017 and has existed since February 6, 1975.

Individual evidence

LUBW

Official online waterway map with a suitable section and the layers used here: Course and catchment area of ​​the Acher
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 after the layer aggregated areas 05 .
    The catchment area includes the Acher and the tributaries Sandbach and Sulzbach / Sasbach. The Acherner Mühlbach as a tributary of the Rhine Low Canal is not part of the catchment area. Of the Oos river system , only the     Oos Canal, which flows into the Sandbach, belongs to the catchment area.
  4. ↑ a b Values ​​from regionalization, data status March 1, 2016 (MNQ, MQ), January 30, 2014 (MHQ) from Abfluss-BW - a data and map service of the State Institute for the Environment Baden-Württemberg ( information )

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. ↑ Dieter Ortlam: The origin of the Acher (Northern Black Forest) based on historical research and the glacial genesis of the Ruhestein (Schwarzwaldhochstrasse).
  3. ^ Josef Riegelsberger: Acher-Rench 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. 146–152, here p. 150.
  4. ↑ Karlsruhe regional council: Polder Söllingen / Greffern - construction: The Acher pumping station with Sielbauwerk - Structural O. ( Memento of 10 September 2012 at the Web archive archive.today ) (Accessed on September 8, 2019).
  5. ↑ A side ditch of the Acher flows into the old mill ditch
  6. ↑ a b c d junction
  7. ↑ reflux

Web links

Commons : Acher  - collection of images, videos and audio files