Riedgraben (Wörnitz, Wechingen)

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Riedgraben
Data
Water code DE : 118712
location Weissenburg-Gunzenhausen district , Middle Franconia district , Bavaria , Germany
River system Danube
Drain over Wörnitz  → Danube  → Black Sea
source about 2 km southeast of Polsingen
48 ° 54 '27 "  N , 10 ° 43' 47"  E
Source height approx.  498  m above sea level NN
muzzle opposite Wechingen from the left into the Wörnitz coordinates: 48 ° 53 ′ 31 ″  N , 10 ° 37 ′ 6 ″  E 48 ° 53 ′ 31 ″  N , 10 ° 37 ′ 6 ″  E
Mouth height approx.  409  m above sea level NN
Height difference approx. 89 m
Bottom slope approx. 9.9 ‰
length 9 km
Catchment area 8.31 km²
Communities Wolferstadt , Polsingen , Munningen , Wechingen

The Riedgraben is a brook in the Bavarian districts of Donau-Ries and Weißenburg-Gunzenhausen , which flows into the Wörnitz from the left after about 9 km to the west across from Wechingen in the eastern Nördlinger Ries .

geography

course

The Riedgraben rises at an altitude of 498  m above sea level. NN about two kilometers southeast of Polsingen in a forest on the lower western slope of the Stampfreitberg in the Donau-Ries district. From here to its mouth, the stream runs steadily to the west. After a few meters, the river flows into the Weißenburg-Gunzenhausen district and feeds the Wemdinger Weiher south of Polsingen , into which a somewhat shorter field path ditch from the northeast also runs. Shortly after the lake, the Riedgraben changes back to the Donau-Ries district and then flows north past Amerbacherkreut .

The brook forks south of Laub and just north of Eulenhof . A left ditch branch, mostly running along dirt roads, first flows south past the Eulenhof and then between the eastern edge of the hamlet and in the west of the Wemdinger Ried; then it changes to a southwestern ditch that drains via Rodelbach and Altwasser into the Wörnitz.

The other branch, on the other hand, flows further west along the northern edge of the Eichholzes and then also along a dirt road and the district road DON 5 towards Wechingen, opposite whose main town it is next to the river bridge of the road at an altitude of 409  m above sea level. NN flows into the Wörnitz from the left after a total of 9.0 km.

The river is the middle course on long stretches of border between the municipalities of Munningen in the north and Wechingen in the south. Apart from the other ditch to the Wemdinger Weiher, it has no significant tributary.

Catchment area

The Riedgraben has a very narrow catchment area of ​​8.3 km², which extends from the south of Hagau about 9.5 km westwards to the mouth; This does not include the drainage area of ​​the left branch on the middle course, which is part of the catchment area of ​​the oxbow lake. The very short eastern watershed borders on the catchment area of ​​the Westenbrunnenbach , which drains over the Möhrenbach into the Altmühl . This is on the summit of the Wemdinger Berg near Hagau sein at 582  m above sea level. NN highest point. North of the catchment area border , the "Westliche" Rohrach flows consistently very close , and a little above it also flows into the Wörnitz opposite the Wemding. Beyond the southern watershed, the Rodelbach flows very close to the beginning, which then moves away from the middle course of the Riedgraben southwest and flows through the left Riedgraben branch into the Wörnitz tributary Altwasser. This also receives inflow from ditches that are created further downwards again closer to the Riedgraben-Unterlauf, west of the hamlet wood, which then flow off to the left in the wide Wörnitzaue.

Natural space

The Riedgraben touches or flows through three natural spaces. It rises at the transition from the southern Franconian Jura in the east to its foreland in the west, where it squeezes through in the area of ​​the Wemdinger Weiher between Polsinger Berg and Blossenberg. For most of its course it then flows in the eastern Nördlinger Ries .

geology

The Riedgraben is formed on the eastern edge of the Ries in the colorful debris that was ejected by a meteorite impact in today's Ries almost 15 million years ago. These also cover the Polsinger Berg ( 501.5  m above sea level ) and the Blossenberg ( 499.1  m above sea level ) immediately north and south of the Wemdinger Weiher. In the eastern basin are otherwise of widespread sedimentary crater of fillings and there are smaller islands with Lösssediment . In the West, closer to the Wörnitz contrast dominate terraces gravel , most recently the wide Auensedimentband the river.

Individual evidence

  1. ↑ a b excerpt from the topographic map of Bavaria Atlas of the Bavarian State Government ( notes )
  2. ↑ a b Directory of the brook and river areas in Bavaria - Danube river area from source to Lech, page 90 of the Bavarian State Office for the Environment, as of 2016 (PDF; 2.3 MB)
  3. ↑ Altwasser is a proper name here. The winding water in the left Wörnitzaue flows downstream between Rudelstetten and Alerheim.
  4. ↑ Ralph Jätzold: Geographical land survey: The natural space units on sheet 172 Nördlingen. Federal Institute for Regional Studies, Bad Godesberg 1962. →  Online map (PDF; 3.9 MB)
  5. ↑ Geology based on the geological map of Bavaria 1: 500,000 layer on: Bavaria Atlas of the Bavarian State Government ( references )

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