Aach (Lake Constance, Romanshorn)

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Aach
Salmsacher Aach
View of the Aachtal; Sulgen in front, Erlen in the middle, Amriswil in the back right and Romanshorn on Lake Constance

View of the Aachtal; Sulgen in front, Erlen in the middle, Amriswil in the back right and Romanshorn on Lake Constance

Data
Water code CH : 280
location Switzerland
River system Rhine
Drain over Rhine  → North Sea
origin between Sulgen and Riedt bei Erlen
47 ° 32 '34 "  N , 9 ° 12' 6"  E
Source height 451  m above sea level M.
muzzle Salmsacher Bucht, Bodensee Coordinates: 47 ° 33 '23 "  N , 9 ° 22' 50"  E ; CH1903:  746 153  /  269 095 47 ° 33 '23 "  N , 9 ° 22' 50"  O
Mouth height 395  m above sea level M.
Height difference 56 m
Bottom slope 3.2 ‰
length 17.6 km
Catchment area 47.4 km²

The Aach or Salmsacher Aach is a stream and from the state road bridge Oberaach a river in the Swiss canton of Thurgau .

geography

course

Mouth of the Aach between Salmsach and Romanshorn

The Aach rises between Sulgen and Riedt bei Erlen and then flows past Riedt and through Erlen . The water runs south past Engishofen , through Oberaach and past Niederaach , Amriswil and Hatswil , where the Aach receives the water from the Aachtal wastewater treatment plant . It forms the municipal boundary between Romanshorn and Salmsach , and then flows into the Salmsacher Bay of Lake Constance after 17.59 kilometers .

The catchment area of ​​the Aach is 47.4 km².

Tributaries

  • Tobelbach ( left ), 5.89 km
  • Mühlebach ( right ), 5.78 km
  • Hebbach ( left ), 6.56 km

environment

The Aach is an important spawning area for lake trout living in Lake Constance . In order to provide them with optimal conditions for reproduction, gravel was poured into the river at certain points or obstacles for the fish to climb were removed.

pollution

The Aach contains residues of pesticides. A large part of the pesticide pollution can be attributed to pesticides from fruit growing .

Between 1996 and 2016 there were eight cases of acute water pollution in the Aach. Most of the time, liquid manure or rainwater contaminated with liquid manure got into the water. In 2015, thousands of fish and small organisms died over a length of around two kilometers, which led to the conviction of a pig farmer in 2018.

In 2020 a broken rainwater pipe was found, which allowed oil to enter the Aach for a long time. It came from contaminated sites in the Romanshorn works yard , where a foundry used to be.

Individual evidence

  1. ↑ a b Geoserver of the Swiss Federal Administration ( information )
  2. ↑ a b c map on ThurGIS. Geographic information platform of the Canton of Thurgau, accessed on February 20, 2020
  3. ↑ a b Aach - Salmsach, Hungerbühl. Table of the current situation of drains and water levels. From the website of the Federal Office for the Environment FOEN, accessed on February 20, 2020
  4. ↑ Armin Petraschek, Ulrich von Blücher: Directory of rivers and lakes according to the Swiss water information system (GEWISS). In: Hydrological Atlas of Switzerland, 1995 edition
  5. ↑ river or stream. On the website of the Office for the Environment of the Canton of Thurgau, accessed on February 20, 2020
  6. ↑ Markus Schoch: "This is the wrong world": The fishermen on the Salmsacher Aach are supposed to pay for the damage caused by others. In: St. Galler Tagblatt (online), October 4, 2010
  7. ↑ Pesticide cocktail in Salmsacher Aach. On the website of Swiss Radio and Television (SRF), March 5th and 6th, 2014
  8. ↑ Markus Schoch: The Aach has been suffering for a long time. In: St. Galler Tagblatt (online), March 29, 2016
  9. ↑ Markus Schoch: Pollution of the Salmsacher Aach: Pig farmers seem to accept the conviction by the Arbon district court. In: St. Galler Tagblatt (online), July 23, 2019
  10. ↑ Markus Schoch: Court sentenced pig farmers for repeated pollution of the Salmsacher Aach. In: St. Galler Tagblatt (online), October 27, 2018
  11. ↑ Markus Schoch: No more oil in the Aach near Romanshorn. In: St. Galler Tagblatt (online), January 18, 2020