Oh (Inn)

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Oh
Mühlheimer Ache, Waldzeller Ache, Pollinger Ache
Mühlheimer Ache in Altheim

Mühlheimer Ache in Altheim

Data
location Upper Austria , Austria
River system Danube
Drain over Inn  → Danube  → Black Sea
source in the Kobernaußerwald
48 ° 5 ′ 3 ″  N , 13 ° 25 ′ 28 ″  E
Source height approx.  660  m above sea level A.
muzzle near Mühlheim am Inn in the Inn Coordinates: 48 ° 17 '39 "  N , 13 ° 12' 24"  E 48 ° 17 '39 "  N , 13 ° 12' 24"  E
Mouth height 327  m above sea level A.
Height difference approx. 333 m
Bottom slope approx. 8.8 ‰
length approx. 38 km
Catchment area 315.1 km²
Discharge at the Mamling
A Eo gauge: 314.9 km²
Location: 1.81 km above the mouth 		NNQ (07/03/1976)
MNQ 1976–2009
MQ 1976–2009
Mq 1976–2009
 MHQ 1976–2009
HHQ (08/12/2002) 		1.65 m³ / s
2.6 m³ / s
5.24 m³ / s
16.6 l / (s km²)
 96.9 m³ / s
206 m³ / s
Left tributaries Mettmacher Ache, Altbach, Lochbach
Small towns Altheim
Communities Waldzell , Lohnsburg , Kirchheim iI , Polling iI , Mettmach , Altheim, Mühlheim aI
Residents in the catchment area 26,000

The Ach , on the lower reaches also Mühlheimer Ache and on the upper reaches Waldzeller Ache , sometimes also called Pollinger Ache , is an approx. 38 km long river in the Innviertel in Upper Austria , which rises in the Kobernaußerwald and flows into the Inn near Mühlheim .

course

The Ach rises on the northern slope of the Kobernaußerwald in the municipality of Redleiten on the watershed to the Frankenburger Redl at an altitude of around 660 m. It flows first to the north and from Magetsham (municipality of Lohnsburg ) relatively straight to the northwest. After around 38 kilometers, it joins the Inn northwest of Mühlheim. On the first two kilometers, the gradient is 4%, then it flattens out increasingly and is 7.8 ‰ in the middle and 4.3 ‰ in the lower reaches. The Ach has an average gradient of 8.5 ‰ over its entire length.

The most important place on the river is Altheim , next to it - upstream - Polling im Innkreis , Kirchheim im Innkreis , Lohnsburg and Waldzell are to be mentioned. Most of the catchment area (315 km²) belongs to the Braunau district , the eastern part in the area of ​​the municipalities of Waldzell, Mettmach and Kirchheim belongs to the Ried im Innkreis district .

The most important feeder is the Mettmacher Ache, whose catchment area at the confluence with 93 km² is about the same as that of the Ach. Two other larger feeders, which also flow in from the left, are the Altbach (catchment area 36.5 km²) and the Lochbach (78.7 km²).

Water flow

The mean discharge at the Mamling gauge is 5.24 m³ / s, which corresponds to a discharge rate of 16.6 l / s · km². The Ach has a very balanced discharge regime , the mean discharge in the month of March with the most discharge is 6.9 m³ / s, not even twice as high as in the months of September and October with the lowest discharge, with 4.2 to 4.4 m³ / s.

environment

While the upper course is relatively natural, the lower course is strictly regulated and has longitudinal barriers and transverse structures in the form of block ramps over long stretches. Today's confluence with the Inn is an artificial puncture.

The catchment area of ​​the Ach consists of about one third each of arable land, forest and grassland. It is rather sparsely populated (67 inhabitants / km²), but characterized by intensive livestock farming. Due to intensive agriculture and sewage, which is only partially cleaned in sewage treatment plants, it is moderately polluted and (as of 2007) has quality class II throughout the course .

Among the main fish species include brook trout and Koppe unloaded headwaters, later in rainbow trout and grayling .

Web links

swell

  • Investigation of restraint measures ( memento of November 11, 2005 in the Internet Archive ) (web document, www.noel.gv.at, pdf; 109 kB)
  • Office of Upper Austria. Provincial government, nature conservation department (ed.): Nature and landscape - models for Upper Austria. Volume 25: Hausruck and Kobernaußerwald room units . Revised Version, Lochen and Linz 2007 ( PDF; 4.1 MB)

Notes and individual references

  1. ↑ a b c d e Office of the Upper Austrian Provincial Government (ed.): Pollinger Ache and Enknach and summary of the results of the Inn and Hausruck districts and their comparison with the central area, studies on water quality. Status 1992–1995 . Water protection report 12/1995, Linz 1995 ( PDF )
  2. ↑ a b Upper Austrian Room Information System (DORIS)
  3. ↑ a b Federal Ministry for Agriculture, Forestry, Environment and Water Management (Ed.): Hydrographisches Jahrbuch von Österreich 2009. 117th Volume. Vienna 2011, p. OG 149, PDF (12.1 MB) on bmlrt.gv.at (2009 yearbook)
  4. ↑ According to another opinion, the source of the Ertlmooser Bacherl ( ⊙ ) is to be regarded as the origin of the Ach. - Reinhard Burgstaller: Wikipedia corrected: Oh does not arise in Redleiten. In: Oberösterreichische Nachrichten, April 9, 2016
  5. ^ Office of Upper Austria. State government: water quality maps