Ustermer Aa

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Ustermer Aa
Aabach
Ustermer Aa in Niederuster

Ustermer Aa in Niederuster

Data
Water code CH : 607
location Canton of Zurich ; Switzerland
River system Rhine
Drain over Glatt  → Rhine  → North Sea
source from the Pfäffikersee
47 ° 20 ′ 22 ″  N , 8 ° 46 ′ 48 ″  E
Source height 537  m above sea level M.
muzzle in the Greifensee coordinates: 47 ° 21 '6 "  N , 8 ° 41' 20"  E ; CH1903:  694 457  /  245 292 47 ° 21 '6 "  N , 8 ° 41' 20"  O
Mouth height 435  m above sea level M.
Height difference 102 m
Bottom slope 9.4 ‰
length 10.9 km
Catchment area 62.75 km²
Discharge at the Niederuster
A Eo gauge : 62.7 km²
Location: 800 m above the mouth 		NNQ (1984)
MQ 1980–2016
Mq 1980–2016
 HHQ (1984) 		130 l / s
1.62 m³ / s
25.8 l / (s km²)
 44.3 m³ / s
Left tributaries Torrent
Discharge from the Pfäffikersee

Discharge from the Pfäffikersee

The Ustermer Aa or the Aabach (not to be confused with the Mönchaltorfer Aa ) is a 10.9 kilometer long stream in the canton of Zurich , which begins as an outflow of the Pfäffikersee ( 537  m above sea level ) and as a tributary of the Greifensee ( 435  m above sea level ) ends. At the beginning the Aa flows to Wetzikon to the southeast, turns there to the northwest, takes in the torrent , crosses the Oberustermer forest in the narrow Aatal and flows through Uster and near Niederuster into the Greifensee.

Industrial history

The Ustermer Aa loses 100 meters in altitude on its short run and therefore drove five mills in the Middle Ages. In the 19th century, the region along the brook became the center of the cotton industry in the Zurich Oberland . 15 spinning mills along the way turned it into a “stream of millions”. In the 20th century, the textile industry was concentrated in a few companies.

Industrial canal and renaturation

To protect against flooding the river was heavily built and channeled. Projects are currently being implemented to restore the course of the stream and enable fish to migrate in the Aa by means of fish ladders and reduced thresholds . In addition, the city of Uster would like to expand the parks along the course of the stream.

See also

literature

  • The industrial revolution in the Zurich Oberland. J. Hanser, 1985
  • The Zurich Oberland industrial nature trail. H.-P. Bärtschi, 1994

Web links

Commons : Ustermer Aa  - collection of images, videos and audio files

Individual evidence

  1. ↑ a b Geoserver of the Swiss Federal Administration ( information )
  2. ↑ Hydrological Atlas of Switzerland of the Federal Office for the Environment FOEN, Table_13
  3. ↑ Topographical catchment areas of Swiss waters: sub-catchment areas 2 km². Retrieved September 8, 2017 .
  4. ↑ Aabach-Niederuster 1980–2016. (PDF) Position 554: monthly samples. In: Office for Waste, Water, Energy and Air, Department of Water Protection. Retrieved August 9, 2017 .
  5. ^ Ueli Müller: Aa [Aabach]. In: Historical Lexicon of Switzerland .
  6. ^ Stefan Hotz: A popular body of water . In: Neue Zürcher Zeitung . No. 77 , April 2, 2014, p. 18 .