Innbach

The Innbach as a border river between Fraham and Pupping

Wiesenmuhle in Fraham

Mouth of the Danube in Innbaches

The Innbach is a river in Upper Austria with a length of about 53 km. It rises on the edge of the house jerk and flows into the Danube Wilhering. Its catchment area is 386 km ².

Course

The Innbach rises in about 600 m altitude in the village coal mine in the municipality Wolfsegg the house jerk. It is fed mainly by former lignite mine water mines. It runs largely in a northeasterly direction. After Gaspoltshofen the Innbach happened communities Meggenhofen, Kematen am Innbach, Pichl bei Wels and Wallern at the Trattnach where the Trattnach flows into him. Shortly after Eferding he joins the Aschach and opens below the Danube power plant Ottenheim - Wilhering into the Danube a few kilometers later. Previously led the Innbach at Trattwörth (municipality Fraham ) in a tributary of the Danube, in the course of power stations Aschach and Ottenheim - Wilhering the mouth was moved. Innbach and Aschach now flow the last kilometers parallel to the Danube in an artificial flume with straight lines.

In the first 1.5 km after the source of Innbach drops by about 100 meters altitude, which corresponds to a gradient of 6.7%. The slope flattens and then increasingly is in the lower reaches only 1.7 ‰.

Inflows

The most important feeder is the Trattnach, with 196.4 km ² a much larger catchment area drained in their mouth as the Innbach 117.7 km ². Shortly before its confluence with the Danube the Innbach absorbs the Aschach, which led directly into the Danube to the construction of the Danube power plant Aschach.

Water management

The average discharge at the level Pichl bei Wels is 0.83 m³ / s, which corresponds to a runoff of only 12.4 l / s · km ². The Innbach has an extremely balanced flow regime, the maximum in March is only 1.7 times higher than the minimum in September.

Mean monthly discharges of Innbaches ( in l / s) at the level Pichl bei Wels Survey period 1971-2008, source:

Use

On Innbach was due to its abundant water supply a variety of mills.

Environment

Above Gaspoltshofen the Innbach is relatively natural and richly textured, and from there to the confluence of Trattnach he is at times highly regulated and straightened. Below, in Eferdinger basin, it flows again relatively close to nature with meanders and the remains of the original floodplain forest.

The catchment area of ​​Innbachs is used intensively for agriculture: 51% of the catchment area are arable land. This and effluents that are cleaned only partially in water treatment plants, the Innbach is considerably impacted with nutrients. He has (as of 2007 ) in the upper reaches of mostly grade II, from the union with the Trattnach grade II to III.

Fauna

The Innbach is populated by a variety of fish, including brown trout, brook trout, Koppe, minnow, grayling, gudgeon, rainbow trout, chub, barbel, roach, rudd, Schneider, perch, nose, hazel, arbor, carp, bream, burbot, pike, walleye and even catfish.