Moosbach (Jonenbach, Affoltern am Albis)

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Moosbach
The Moosbach near Zwillikermoos

The Moosbach near Zwillikermoos

Data
Water code CH : ZH100418
location Switzerland
Canton Zurich
Knonaueramt
River system Rhine
Drain over Jonenbach  → Reuss  → Aare  → Rhine  → North Sea
source on Obfelderstrasse in Affoltern am Albis
47 ° 16 ′ 21 ″  N , 8 ° 26 ′ 22 ″  E
Source height 485  m above sea level M.
muzzle at Zwillikon in the Jonen coordinates: 47 ° 17 '13 "  N , 8 ° 26' 7"  E ; CH1903:  675 405  /  237 814 47 ° 17 '13 "  N , 8 ° 26' 7"  O
Mouth height 464  m above sea level M.
Height difference 21 m
Bottom slope 8.9 ‰
length 2.4 km
Catchment area 1.77 km²
Communities Affoltern am Albis , Obfelden
Moosbach near Zwillikermoos

Moosbach near Zwillikermoos

The Moosbach is a 2.4 kilometer long left tributary of the Jonen in the southwest of the Swiss canton of Zurich . It flows through the communities Affoltern am Albis and Obfelden of the Knonaueramt .

geography

course

The Moosbach rises inverted at 485  m above sea level. M. on Obfelderstrasse in the southwest of Affoltern am Albis near the Knonauer Amt service area on the A4 motorway . In earlier times there was a small moor, through which the Lindenbach also flowed. At that time the area still belonged to the municipality of Obfelden before the border was slightly corrected to the south.

The stream initially flows under the built-up area to the northwest and takes on two drainage lines from the right, which have been draining areas in the Chalchofen settlement into the Moosbach since 1920 . Shortly afterwards it crosses the border to the municipality of Obfelden, which protrudes here in a corner to the north. It crosses the agriculturally used Mettenholz corridor before it is covered by dense wood at 474  m above sea level. M. first comes to the surface. The edge of the wood follows the course of the brook to the bridge of the Zwillikerstrasse between Bickwil and Zwillikon , after which it directly crosses the municipality boundary to Affoltern am Albis.

It now forms the southern edge of the Chüeweidhölzli forest on its gently meandering stream , and forms a small moor. At a short distance from the left bank, the municipal boundary extends to the bridge at the Schützenhaus. The stream now crosses a Worm Ice Age terminal moraine landscape , while it flows between the corridors Haldenmoos on the left bank and Zwillikermoos on the right bank. The Zwillikermoos used to be an extensive flat moor before the soil was made usable for agriculture. A short right-hand inflow is no longer available today.

The Moosbach flows shortly to the north, before one at Steinacher up to 485  m above sea level. M. high moraine forces the brook to form a larger curve to the east. On the right bank, two more moraines now run against the direction of flow to the southeast. The slope of the eastern moraine directs the stream north into the settlement area of ​​Zwillikon. The Moosbach is overturned and passes under the Alte Affolterstrasse and the Ottenbacherstrasse .

The Moosbach finally flows after a low waterfall at 464  m above sea level. M. at the Zwillikerweiher directly at the bridge of Ottenbacherstrasse coming from the left and south into the lower reaches of the Jonen.

Catchment area

The catchment area of ​​the Moosbach measures 1.77 km², of which 58.3% is agricultural area, 25.8% wooded area and 15.9% settlement area. The highest point of the catchment area is 532  m above sea level. M. am Isenberg reached, the average height is 488  m above sea level. M. and the minimum height 464  m above sea level. M. The average annual rainfall is between 1098.95 mm in the headwaters and 1225.25 mm in the rest of the catchment area. In addition to Affoltern am Albis and Obfelden, it extends over small areas on the eastern side of the Isenberg, which belong to the municipality of Ottenbach .

Web links

Commons : Moosbach  - Collection of images, videos and audio files

Individual evidence

  1. ↑ a b c Geographic information system of the Canton of Zurich
  2. ↑ a b c Topographical catchment areas of Swiss waters: sub-catchment areas 2 km². Retrieved September 7, 2018 .
  3. ↑ Base areas (catchment areas) HADES. Retrieved September 8, 2018 .