Wehra

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Wehra
The Wehra in the gorge-like middle reaches

The Wehra in the gorge-like middle reaches

Data
Water code EN : 2314
location Southern Black Forest

Dinkelberg

Baden-Württemberg

River system Rhine
Drain over Rhine  → North Sea
source in Berglewald km northeast about 3.6 the center of Todtmoos sub Todtmoos
47 ° 45 '1 "  N , 8 ° 1' 47"  O
Source height approx.  1025  m above sea level NHN
muzzle at the Wehr-Brennet sewage treatment plant from the right and overall north-northeast in the Upper Rhine Coordinates: 47 ° 34 '56 "  N , 7 ° 54' 13"  E 47 ° 34 '56 "  N , 7 ° 54' 13"  E
Mouth height approx.  282  m above sea level NHN
Height difference approx. 743 m
Bottom slope approx. 28 ‰
length 26.1 km 
with the upper reaches of the Hohwehra
27.6 km
with the upper reaches of Rüttebach / Rüttebächle
Catchment area 113.021 km²
Outflow
A Eo : 114.8 km² 		MNQ
MQ
Mq
 MHQ
 680 l / s
3.71 m³ / s
32.3 l / (s km²)
 32.84 m³ / s
Right tributaries Rüttebach (main line), Rotmoosbach, Brandbach, Hasel
Reservoirs flowed through Wehratalsperre

The Wehra is a river in the southwestern southern Black Forest in Baden-Württemberg and a right tributary of the High Rhine .

geography

Location and topography

The Wehraschlucht before 1900, colored photo

The Wehra valley is clearly divided into three sections.

The upper course is a typical Black Forest high valley, but with a depth of 200 to 300 meters it is significantly more relief than the neighboring high valleys of the Hotzenwald to the east . Its center is the town of Todtmoos , which fills the largest valley widening of the valley, which has been conspicuously shaped by ice age glaciers.

In its middle course, the Wehra cuts a gorge, some 400 meters deep, into the southwestern slope of the Black Forest. Wooded steep slopes alternate with rock faces almost 100 meters high in some places. This steep section of the river is a nationally known, extremely difficult white water route . A rock spur there is called Hirschsprung .

The approximately seven-kilometer-long lowest section of the valley separates the barely indented, steep, 500-meter-high western slope of the Hotzenwald from the heavily karstified plateau of the Dinkelberg , which only rises a good 100 meters west of the Wehratal. The main town of this wide valley is the small industrial town of Wehr , which is increasingly touristy. In the Brennet district, the Wehra flows into the Rhine, still within sight of the city of Bad Säckingen upstream .

Catchment area

The Wehra drains a narrow and elongated catchment area of ​​around 113 km². From a natural point of view, it is located up to about Wehr in the Black Forest , then in the lower Wehratal area of the Dinkelberg to the west .

The boundary of the natural area corresponds to a clear layer boundary between the crystalline basement of the Black Forest and the Mesozoic layers of the Dinkelberg. As far as Todtmoos-Au, the two upper courses and the subsequent Wehra section run between mountains, where the Todtmoos gneiss anatexite formation is predominantly found , with the exception of the western Todtmoos valley basin, where these are covered by glacial sediments. After Au, the Wiese-Wehra formation can be found underground in the Black Forest in the greater part of the catchment area , plus almost only islands made of St. Blasien granite , which have already been heavily scattered. The change at Wehr is abrupt due to a clump of fault lines running from north to south, which have produced strips of Mesozoic layer clods , from the Jura mostly close to the edge of the Black Forest via the Keuper to the Upper Muschelkalk , which predominantly occupies the area west of the run. On the low ridge between the Wehra and Hasel and near the mouth there are also much younger low-terrace gravel of the Rhine Glacier. The edge of the Black Forest is mostly crossed by shorter faults from west-northwest to east-southeast, for example on the axis of the Mühlgrabenbach valley.

The two highest mountains are both on the northern edge of the Todtmoos valley basin, which is 1263.4  m above sea level. NHN high Hochkopf on the north-west and the 1218  m above sea level. NHN high Farnberg on the northeast side. The catchment area is bordered by those of the Hauensteiner Alb in the northeast, the Hauensteiner Murg in the east and, finally, the short Rötelbach in the southeast. On the other hand, in the southeast, smaller tributaries also run south to the Upper Rhine, before finally, behind the long northwestern watershed, the meadow also drains its runoff to the Upper Rhine.

The steep relief, the resulting high flow velocities and the dense subsurface of the crystalline basement promote flooding, while the mostly short inlets and the slender catchment area alleviate this danger somewhat.

Tributaries and lakes

The main source of the Wehra is the Rüttebach , with which the named source river, also known as the Hohwehra, joins in Vordertodtmoos. The Rüttebach has almost four times the water flow and almost twice the length of the Hohwehra. Many of the tributaries on the edge of the trough of the Wehratal form gorges and, like the Rüttebach, run over waterfalls. The longest tributary is the 13 km long hazel, the others are mostly less than 5 km long.

Hierarchical list of tributaries and RiverIcon-SmallLake.svglakes from source to mouth. Length of water, lake area, catchment area and altitude according to the corresponding layers on the LUBW online map. Other sources for the information are noted.
Selection.

Confluence of the Wehra at about 802  m above sea level. NHN in Todtmoos -Vordertodtmoos.

  • Hohwehra or Wehra, left branch upper reaches from the northeast, 2.6 km and 2.3 km². Rises at about 1025  m above sea level. NHN of Wehraquelle in Berglewald approximately 2.6 km northeast of the town center of front Todtmoos.
  • Rüttebach, on the upper and middle reaches to Todtmoos-Höfle still Rüttebächle, right main line upper reaches from the north, 4.2 km and 9.2 km². Arises at about 1055  m above sea level. NHN approx. 1.0 km north-northeast of Todtmoos-Rütte near the L 146 at the Red Cross pass .
    • Falls over the Todtmoos waterfall between Rütte and Todtmoos-Hintertodtmoos.
      Todtmoos waterfall
    • Sägebach, from the right and northwest to about 820  m above sea level. NHN near Höfle, 3.1 km and approx. 4.1 km². Arises at about 1140  m above sea level. NHN near the mountain station of the ski lift on the eastern slope of the mountain Beim Dreieckigen Stein.
  • Todtenbach, from the right and northwest to about 800  m above sea level. NHN in Vordertodtmoos, 3.4 km and 2.4 km². Arises at about 1135  m above sea level. NHN on the southern slope of the saddle between Beim Dreieckigen Stein and Schweinele.
  • Sägelochbach, from the right and northwest to about 776  m above sea level. NHN at the sewage treatment plant near Todtmoos-Wehrawald, 2.6 km and 1.8 km². Arises at about 1090  m above sea level. NHN on the northeast slope of the Steinbühl.
  • Rotmoosbach, with the right upper course Fetzenbach, from the right and northwest to about 690  m above sea level. NHN in Todtmoos-Au, 4.4 km and 7.1 km². The Fetzenbach arises at about 1020  m above sea level. NHN on the Upper Hollow Fir Tree on the eastern slope of the Rohrenkopf.
  • Ostbrandbach, at the beginning and on most of the course Gersbach, from the right and northwest to below 600  m above sea level. NHN near the pump house on Brandkopf in the district of Schopfheim - Gersbach , 4.4 km and 5.1 km². The Gersbach arises at about 1060  m above sea level. NHN on the southern slope of the Rohrenkopf north of Gersbach.
    At the point from which the stream is called Ostbrandbach, the also only short Vordere Brandbach descends southwards and flows into the Brandkopf.
  • RiverIcon-SmallLake.svgFlows through the Wehra reservoir at about 419  m above sea level. NHN behind the Wehratalsperre , 18.8 ha. Is the lower basin of the Wehr power plant , the associated upper basin Hornberg basin is located at about 1048  m above sea level. NHN is about 3 km to the northeast on the eastern watershed.
  • Mühlgrabenbach, from the left and east-southeast at the power station on the east bank of the reservoir, 2.8 km and 4.2 km². Arises at about 860  m above sea level. NHN near Herrischried -Atdorf.
  • Hasel , from the right and north to over 320  m above sea level. NHN at the substation near Wehr- Hemmet, 13.0 km and 25.0 km². Arises at about 985  m above sea level. NHN north-west of Gersbach at the Wallisbrunn hiking home at the south-west foot of the Rohrkopf. With section name sequence Lochbach → Haselbach → Hasel .

Mouth of the Wehra from the right and last but not least again northeast to about 282  m above sea level. NHN after the sewage treatment plant at Wehr-Brennet in the Upper Rhine , shortly after the Rötelbach or Rödelbach . The Wehra ust from the confluence of its upper reaches Hohwehra and Rüttebach / Rüttebächle 23.4 km, together with the longer Rüttebach / Rüttebächle 27.6 km long and has a 113.0 km² catchment area. It supplies the Rhine with an average of 3.71 m³ / s of water.

Development

The lower course of the Wehratal is accessed by the federal road 518 , which , coming from the B 34 at the mouth of the Wehra, crosses the ridge to the meadow and is taken up by the B 317 in Schopfheim .

The upper reaches of the Wehratales with the Wehraschlucht gorge are accessed by the state road 148, which comes from the B 518 at Wehr and leads through the gorge to Todtmoos , where it joins the L 151 crossing the valley. Rock falls occur again and again on the L 148. In February 2018, for example, the road between Wehr and Todtmoos, which had been closed on one side since December 2017 due to rock securing work, had to be completely closed. After the road was opened again at the beginning of February, the company carrying out the clean-up discovered another boulder in mid-February, which had to be classified as "immediately in danger of falling" and therefore required the road to be completely closed.

From Todtmoos, the L 150 continues through the valley in which the “official” source of the Wehra is located, over the heights of the ridge into the Alb valley to St. Blasien .

The L 151 runs in the west through the Sägebach valley. Between Todtmoos and Hintertodtmoos, the L 146 continues from the L 151 through the Rüttebachtal.

The Schluchtensteig and Wehratal Adventure Path hiking trails lead along the Wehratal . The Glaträgerweg crosses from Todtmoos to Todtmoos-Au.

Hydropower

At the end of the Wehraschlucht, about 7.5 km above the mouth, the Wehratalsperre dams the river to a lake about 1.35 km long at about 420  m above sea level. NN at. In connection with the Hornberg level ( Hornberg basin at about 1050  m above sea level ), it is used to generate hydropower.

Curiosity

In the spring of 2016, strangers set up a plastic deer weighing around 30 kilograms at the deer jump. At the beginning of 2017, the Freiburg Regional Council decided that it had to be removed from the fauna and flora habitat that is worth protecting there. At the beginning of March 2017, the deer was removed by strangers. The plastic deer reappeared there in April 2019. Wehr's mayor Michael Thater would like to replace it with a bronze stag, but the rock is subject to four-fold nature protection.

Individual evidence

LUBW

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

  1. ↑ a b c Height according to the contour line image on the background layer topographic map .
  2. ↑ a b c d Length according to the waterway network layer ( AWGN ) .
  3. ↑ a b catchment area after the layer aggregated areas 04 .
  4. ↑ a b Height according to black lettering on the background layer topographic map .
  5. ↑ Lake area after the layer standing waters .
  6. ↑ Catchment area according to the basic catchment area layer (AWGN) .
  7. ↑ a b Catchment area measured on the background layer topographic map .
  8. ↑ Catchment area after the layer aggregated areas 05 .

Other evidence

  1. ↑ a b Hydrosond office, E. Kunk office: PSW Atdorf, expert report hydrogeology and thermal springs Bad Säckingen (PDF; 2.3 MB) , 2010, p. 39
  2. ↑ Hotzenwald hiking map, Baden-Württemberg Land Survey Office, 2nd edition 2008, ISBN 978-3-89021-593-8
  3. ↑ Günther Reichelt : Geographical land survey: The natural spatial units on sheet 185 Freiburg i. Br. Federal Institute for Regional Studies, Bad Godesberg 1964. →  Online map (PDF; 3.7 MB)
  4. ↑ Geology according to: Mapserver of the State Office for Geology, Raw Materials and Mining (LGRB) ( notes )
  5. ↑ Martin Köpfer: L148 closed again after a rock fall - at least until next Friday - Wehr - Badische Zeitung. Badische Zeitung, February 7, 2018, accessed on February 16, 2018 .
  6. ^ BZ editorial team: Blocking of the L 148 has been lifted - Wehr - Badische Zeitung. Badische Zeitung, February 9, 2015, accessed on February 16, 2018 .
  7. ^ BZ editorial team: Road through the Wehratal closed immediately - Wehr - Badische Zeitung. Badische Zeitung, February 16, 2018, accessed on February 16, 2018 .
  8. ^ Katharina Valenta-Wichmann: Wehratal adventure trail. (PDF, 0.98 MB) City of Wehr, accessed on April 9, 2019 .
  9. ↑ Course of the Glaträgerweg in the southern Black Forest. Retrieved July 20, 2013 .
  10. ↑ Markus Donner: Buchenbach: Kesse plastic copy: Office knows no mercy for deer plagiarism in the Wehratal. Badische Zeitung, January 17, 2017, accessed on January 18, 2017 .
  11. ↑ Erika Bader: Wehr: Waldshut district: The plastic deer in the Wehratal is gone again. Badische Zeitung, March 9, 2017, accessed on March 10, 2017 .
  12. ↑ Erika Bader: Illegal plastic deer is back on its rock in the Wehratal. Badische Zeitung, April 8, 2019, accessed on April 9, 2019 .

literature

  • Topographic map 1: 25,000 Baden-Württemberg, as single sheet No. 8213 Zell im Wiesental, No. 8214 St. Blasien, No. 8313 Wehr and No. 8314 Görwihl

Web links

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