Hirlbach (Schwarzach)

from Wikipedia, the free encyclopedia
Hirlbach
Hirlbach Schwarzach 21.jpg
Data
location Altmühlalb

Northern part of the southern Franconian Alb


Bavaria

River system Danube
Drain over Schwarzach  → Altmühl  → Danube  → Black Sea
origin north-west of the Wehrtechnischen Dienststelle 81
49 ° 3 ′ 52 ″  N , 11 ° 21 ′ 3 ″  E
Source height approx.  470  m above sea level NHN
muzzle from the left and northeast at the boundary between Hausen and Greding Coordinates: 49 ° 3 '26 "  N , 11 ° 19' 50"  E 49 ° 3 '26 "  N , 11 ° 19' 50"  E
Mouth height approx.  387  m above sea level NHN
Height difference approx. 83 m
Bottom slope approx. 45 ‰
length 1.9 km
Catchment area approx. 3.5 km²

The Hirlbach is almost two kilometers long year-round flowing water of the 3rd order north of the urban area of Greding in the district of Roth in Bavaria .

geography

course

The Hirlbach rises at approx. 470  m above sea level. NHN about a hundred meters north-west and below the military technical department 81 in its Waldkerntal, which continues upwards. It flows along its entire length in a south-westerly to west-south-westerly direction and is the border between the suburbs of Greding itself on the left and of Röckenhofen and later Hausen on the right. After about half of the run, the corridor opens between the Judenzipfel on the right and on the last half kilometer it also separates from the sloping forest of the Gredinger Kalvarienberg on the left. Fountain IV of the Jura-Schwarzach-Thalach group, whose waterworks is in Hausen, is on the Hausner side in the former Ochsenfeld of the municipality. Here the stream is dammed up by a beaver to form a reservoir. Immediately afterwards the State Road 2227 crosses it on the Steinerl Bridge . About three hundred meters further it flows out at about 387  m above sea level. NHN from the left a little below Hausen and opposite the A 9 on the opposite slope into the Schwarzach, which flows here southeastward .

After its approx. 1.9 km long run with an average bottom gradient of around 45 ‰, it flows about 83 meters below its origin.

Catchment area

The Hirlbach has a catchment area of ​​approx. 3.5 km² on the surface. Whose at 544  m above sea level. NHN's highest point is at its northern tip on a knoll south of Röckenhofen, which , in terms of natural space , belongs with the larger part, especially on the Alb plateau, to the lower area of ​​the western Sulzplatte of the northern part of the southern Franconian Alb and with the parts near the mouth to the lower area of Schwarzach-Thalach valley funnel of the Altmühlalb . There is Jura rock everywhere that is karstified . On the heights it is the White Jura and in the valleys it is the Brown Jura . On the plateau there are almost only fields, with the exception of the triangular southern spur of the Kalvarienberg between the valleys of Hirlbach in the northwest, Schwarzach in the southwest and Agbach in the east, where mainly green areas are located in the cordoned-off military area. Even before the construction of WTD 81, the area was wasteland due to the water seeping through the karst . Part of the water wells up again in the Hirlbach. It was and is being used as a sheep pasture. The area belongs to the city of Greding and is located in the Altmühltal Nature Park .

Water quality

The entire stream is classified as water quality class I-II, with low pollution. All stretches of water have a low supply of inorganic or organic nutrients, are without significant oxygen consumption and are mostly populated by a large variety of species.

literature

Web links

Individual evidence

BayernAtlas ("BA")

Official online waterway map with a suitable section and the layers used here: Course and catchment area of ​​the Hirlbach
General introduction without default settings and layers: BayernAtlas of the Bavarian State Government ( notes )

  1. a b Height queried on the background layer Official map (right click).
  2. Length measured on the official map background layer .
  3. ↑ Catchment area measured on the official map background layer .
  4. Height after black lettering on the background layer of the official map .
  5. Geology according to the layer geological map 1: 500,000 . (Only displayed on a large scale.)
  6. Protected area according to the relevant layer.

Others

  1. 'Waters in the district of Roth' water cadastre of the government of Middle Franconia, accessed on May 27, 2018
  2. ^ Dietrich-Jürgen Manske : Geographical land survey: The natural space units on sheet 164 Regensburg. Federal Institute for Regional Studies, Bad Godesberg 1981. →  Online map (PDF; 4.8 MB)
  3. Water quality in the district of Roth , accessed on March 4, 2016