Ernsbach (Riedbach)

from Wikipedia, the free encyclopedia
Ernsbach
Data
Water code DE : 23866566
location Hohenloher level

Baden-Württemberg

River system Rhine
Drain over Riedbach  → Bühler  → Kocher  → Neckar  → Rhine  → North Sea
source approx. 0.3 km west of the Obersontheim-Hausen underground gypsum quarry
49 ° 3 ′ 22 ″  N , 9 ° 52 ′ 10 ″  E
Source height approx.  399  m above sea level NHN
muzzle approx. 0.4 km west of the outskirts of Untersontheim from the right in the Riedbach coordinates: 49 ° 3 '50 "  N , 9 ° 53' 2"  E 49 ° 3 '50 "  N , 9 ° 53' 2"  E
Mouth height approx.  369  m above sea level NHN
Height difference approx. 30 m
Bottom slope approx. 18 ‰
length about 1.6 km
Catchment area approx. 1.1 km²

The Ernsbach is a meadow brook in the area of ​​the municipality of Obersontheim in the district of Schwäbisch Hall in northeastern Baden-Württemberg , which flows into the Riedbach from the right after a roughly one and a half kilometer long, approximately northeastern run west of the village of Untersontheim .

geography

course

The Ernsbach arises about 300 meters west of the Obersontheim-Hausen underground gypsum works at about 399  m above sea level. NHN at the western tip of a meadow valley bay at the foot of the north slope of the wooded Hitzberg (up to approx. 439  m above sea level ). In a natural, clay-rich gully, a forest path runs down to this point from further above, but without a bed and normal water flow. From there, the stream, accompanied by a tree gallery, runs first across the valley meadow to the east, then along the lower edge of the forest, from which it experiences a flow from a small swamp, and then crosses the fenced area in front of the, which is only a few dozen meters wide Gallery mouth of the plasterwork. Behind it, with only sparse shrub growth, it turns slowly to the left through a meadow from the foot of the Hitzberg, runs between a large roofed wood storage area on the left and the Obersontheim single property, the Gipshütte on the lower Hitzbergsporn, under a field path and then flows piped through the dam on Landesstraße 1060 Hausen - Bühlertann through.

Spring pot overgrown with watercress

Now on the north-east run without any forebears, it passes a narrow, less than twenty meters long, wooded pond at a distance of a few meters, which is only seldom and then sparsely fed from a pipe and the surface of which is often covered by a film of dirt. A little further downwards, after almost a consistently straightened course, about a kilometer below the origin to the mouth of the river bank trees, which now accompany the stream to the mouth, which now flows with audible splashing in small changes of direction on sandy or gravelly ground between trees and bushes. At the bridge of the field path from Hausen towards the west of Obersontheim, which soon afterwards crosses, an approximately 200-meter-long tributary flows out of the damp meadows on the left, which begins in a spring pot overgrown with watercress, which is fed from at least one drainage pipe, as well as a smaller drainage a very near swell basin. On the next half a kilometer to the next bridge over the dirt road, water flows in from the left from short channels; the Bachgalerie temporarily widens to this side to a small, loose deciduous forest. After this, the Ernsbach runs for about 250 meters with a narrow gallery again, hard on the left foot of the slope, apparently on a younger route, while the floodplain widens sharply on the right and merges into that of the Riedbach. The Ernsbach finally flows a few steps below a third cross country lane bridge after 1.6 km from the right and southeast about 400 meters west of the outskirts of Untersontheim in the Riedwiesen at about 369  m above sea level. NHN in the lower Riedbach .

The Riedbach is about 1.6 km long and loses about 30 meters in height on this route with a mean bottom slope of about 18 ‰.

Catchment area

The Ernsbach has a catchment area of ​​1.1 km². It extends about 2.3 km from near the summit of the Häuserberg ( 449.6  m above sea level ) to the northeast to the mouth. The highest point is on this south-western point on the Hausberg, where the catchment area of ​​the largest tributary, Fischach , borders on the upper Bühler. The right watershed in the southeast runs over the Hitzberg to a little after the Gipshütte and then against the Schießbach , finally against smaller, completely ruined watercourses in Obersontheim. The north-western one moves in mostly much deeper terrain against the Riedbach receiving water itself above the Ernsbach inlet.

The landscape consists mainly of open meadows. Forest stands on the hillside of the spring bay, the layers on the land platform still west above it up to the mountain of houses is mostly under the plow. On the lower reaches of the right watershed there are houses from Obersontheim, which have been built since the end of the 20th century and whose settlement and commercial areas are spreading more and more westwards.

The entire catchment area is located in the municipality of Obersontheim. In terms of its natural surroundings , it is located in the southern part of the Hohenlohe Plain in the Vellberger Bay , the Bühler's exit bay from the Keuperbergland .

The brook runs in the lower Mittel- and in the Unterkeuper . The highest point on the summit of the Hausberg in the far south-west lies in the reed sandstone ( Stuttgart formation ), which then soon merges into the gypsum keuper ( grave field formation ), namely over a border of its estheria layers on a terrain platform and above the spring bay slopes, for which the dolomitic, erosion-resistant and therefore step-forming Corbulabank is the cause. The stream itself then only arises in the lower Gipskeuper, it reaches the Lettenkeuper ( Erfurt formation ) a little after the state road , where the sources of its small tributaries arise. Surrounded by a floodplain sediment band for a long time, it flows into the flood sediment of the Riedbach, which runs eastwards at a valley widening of the Riedbach, which runs eastward on the deep line of the long-reaching subsidence zone Neckar-Jagst-Furche , which is morphologically pronounced here as a wide hollow.

The basic gypsum layers of the Hitzberg are or were mined underground in the Obersontheim-Hausen gypsum quarry. On the Hitzberghang to the west of it, sinking funnels can be seen, which are probably partially filled gypsum  dolines . At the gypsum hut on the lower eastern spur of the Hitzberg, gypsum was quarried in the artisanal style in earlier times, which is evidenced by a still fairly recognizable hollow on the slope. In the Hausener Gewann Wacholder in the spur, which extends less to the west, to the left of the source bay and its apron, gypsum is due, which was cut years ago in the course of the re-routing of the state road.

Running deviations from the official waterway map

The course drawn on the official waterway map and given with a length of 1.1 km is incorrect in the upper and lower reaches.

The upper course lacks the 600 meter long section from the meadow bay and along the foot of the Hitzberg to the northwest turn near the gypsum hut on this side of the L 1060. In its westernmost part in front of the gypsum works, as evidenced by the accompanying gallery, this seems to be of natural origin. From the point where the Ernsbach still reaches the edge of the forest to the west of the gypsum quarry, it is evidently at least a deepened and straightened ditch.

For the lower Ernsbach, from the bridge of the second crossing field path, which accompanies the Riedbach on the right at the edge of the L 1060 at Hausener Wacholder to Untersontheim, a wrong course has been entered today. From there the stream flows in nature, still accompanied by its gallery, hard at the foot of the left bank to the northeast; the almost eastern course drawn there on the waterway map is nowadays rather the route of a narrow ditch next to the mentioned eastward path with mostly no flow at all, but seems to roughly reflect an old course, because older maps show roughly the same course, with in addition, a number of meanders, of which nothing can be seen today. The noticeable abrupt right widening of the Riedbach floodplain in the Riedbachwiesen at today's confluence point can probably only be explained by the Ernsbach flowing further below and at a shallower angle.

See also

Individual evidence

LUBW

Official online waterway map with a suitable section and the layers used here: Course and catchment area of ​​the Ernsbach
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 Length measured on the background layer topographic map .
  3. ↑ a b Deviating from the water network layer ( AWGN ) , which names 1.1 km in length. See the section -  Deviations from the official waterway map .
  4. ↑ Catchment area measured on the background layer topographic map .
  5. ↑ Height according to the gray lettering on the background layer topographic map .
  6. ↑ Length according to the waterway network layer ( AWGN ) .

Other evidence

  1. ↑ Wolf-Dieter Sick : Geographical land survey: The natural space units on sheet 162 Rothenburg o. D. Deaf. Federal Institute for Regional Studies, Bad Godesberg 1962. →  Online map (PDF; 4.7 MB)
  2. ↑ Geology according to the geological map mentioned under →  Literature as well as verbal reports from residents. A coarser overview of the pending geological layers also provides: Map server of the State Office for Geology, Raw Materials and Mining (LGRB) ( information )

literature

  • Topographic map 1: 25,000 Baden-Württemberg, as single sheet No. 6925 Obersontheim
  • Geological map of Baden-Württemberg 1: 25,000, published by the State Geological Office 1982, sheet no. 6925 Obersontheim with explanatory booklet.

Web links

Commons : Ernsbach  - collection of pictures, videos and audio files