Irlbach (Danube)
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Irlbach Oberlauf: Wiesgraben |
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 west of the town of Irlbach |
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| Data | ||
| Water code | EN : 15922 | |
| location | Bavaria | |
| River system | Danube | |
| Drain over | Niederastgraben → Danube → Black Sea | |
| source | of the upper reaches Wiesgraben at the easternmost farm of Hölldorf in the municipality of Oberschneiding 48 ° 46 ′ 55 ″ N , 12 ° 37 ′ 56 ″ E |
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| Source height | 376 m above sea level NHN | |
| muzzle | in Irlbach at the confluence of the Weidenstrasse and the Donaustraße under the river dike from the right and from the southwest into the Danube Coordinates: 48 ° 50 ′ 38 ″ N , 12 ° 45 ′ 41 ″ E 48 ° 50 ′ 38 ″ N , 12 ° 45 ′ 41 ″ E |
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| Mouth height | approx. 312 m above sea level NHN | |
| Height difference | approx. 64 m | |
| Bottom slope | approx. 4.3 ‰ | |
| length | approx. 14.8 km of which approx. 1.7 km upstream Wiesgraben |
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| Catchment area | 57.33 km² | |
The Irlbach is an approximately 15 km long brook in the Dungau in the Lower Bavarian district of Straubing-Bogen , which after a roughly north-easterly run in Irlbach flows from the right into an area of the Danube separated from the main stream by a dam .
geography
course
The Irlbach arises on the easternmost yard of the village of Hölldorf in the municipality of Oberschneiding at about 376 m above sea level. NHN little before the Oberschneidinger community wood as Wiesgraben , which runs northeast towards Niederwalting and then crosses it north. Shortly before the nearby Oberschneiding itself, it is called Irlbach , crosses the main town in this direction and then turns past the Schierlhof on a north-east course with frequent short changes of direction. He crosses under the B 20 and then passes through the village of Taiding , where a first long tributary from the south comes in from the right. Soon after leaving the village, it enters the settlement area of Niederschneiding and also passes through it.
A good bit further down, it takes up the Dorfbach from the right , which arises in the settlement area of the Kirchdorf Paitzkofen of the community of Straßkirchen . A little afterwards it passes through the district of Haberkofen , north of it the longest tributary Ödbach runs from the southwest , in the direction of which the Irlbach then runs through Straßkirchen itself, the largest town on its course. A little further on, he changes to the municipality in front of Irlbach , where he runs eastwards into the eponymous parish village. In front of the left embankment of the Danube there is a Mahlbusen in the backwater area of the Irlbach pumping station, which used to be at high water levels in the receiving water under the Donaustraße and through the dam from the right and at about 312 m above sea level. NHN pumped the incoming water into a part of the Danube separated by a longitudinal dam , into which the Niederastbach already flows a little further upstream .
Although this only has a catchment area of only around 20.0 km² up to the Irlbach, it also receives inflow from the Ainbrach river system via the Irlbach-Ainbrach-Ableiter / Straßgraben , which is why the Irlbach apparently counts as a tributary of the Niederastbach, which is then good half a kilometer downstream at the point where the longitudinal dam in the course of the river ends almost on the right bank, through the small gap that has been left open into the flow zone of the Danube itself.
Today, on the other hand, the Irlbach no longer drains in its natural bed eastwards to the Danube, but becomes at the bend a little west of Irlbach, where there is a double gate, over the so-called Irlbach arrester in an arc around the village to the northwest and to the sluice of the Niederastbach directed; the pumping station only has to drain the small catchment area from the discharge gate. When the Danube floods, the Niederastbach-Siel is closed today, the lowland west of the village, which is protected by a ring dike, is then gradually flooded by the backwater.
Catchment area
The Irlbach drains 57.3 km² of a triangle of land that tapers towards the eastern edge of the village of Irlbach and that briefly bends eastwards to the Danube. From the mouth upwards there is an area beyond the right watershed from which no body of water runs openly to the Danube. The southern through the Oberschneidinger community wood and the Riedlinger wood runs over the two largest elevations in it with once 421 m above sea level. NHN and once 422 u m. NHN at height and separates it from the catchment area of the Reissinger Bach , which drains to the lower Isar . On the left watershed from the southwestern tip of the catchment area, the Aiterach and then the Ainbrach-Oberlauf Schambach compete for only a short section , both run in the direction of the upward Danube, then on the left is the immediate catchment area of the Niederastgraben , which leads away the main part of the Irlbach water .
Individual evidence
- ↑ a b c d Height requested on the BayernAtlas (right click). See the → web links .
- ↑ Length according to the list of brook and river areas in Bavaria - Naab to Isar river area, page 119 of the Bavarian State Office for the Environment, as of 2016 (PDF; 2.8 MB), supplemented by an upstream section of around 0, which is not taken into account there and measured on the BayernAtlas , 2 km in length.
- ↑ Length measured on the BayernAtlas.
- ↑ Catchment area according to the list of brook and river areas in Bavaria - Naab to Isar river area, page 119 of the Bavarian State Office for the Environment, as of 2016 (PDF; 2.8 MB).
- ↑ Catchment area according to the list of brook and river areas in Bavaria - Naab to Isar river area, page 118 of the Bavarian State Office for the Environment, as of 2016 (PDF; 2.8 MB).
- ↑ Discharge conditions on the Irlbach according to the final report of the research project “Development of a methodology for the measurement of pumping station performance in Bavaria” (PDF, 8.1 MByte), especially p. 36f and page 55ff. Site plan also on a flyer from Rhein-Main-Donau AG ( Memento of the original from March 4, 2016 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. (PDF, 1.1 MB).
literature
- Official topographic map 1: 25000 . Sheet K 16, 2012, ISBN 978-3-89933-433-3 .
Web links
- Map of the Irlbach on: BayernAtlas of the Bavarian State Government ( notes ) (For the exact mouth conditions, please enlarge there.)