Obermühleweiher (Tettnang)

Obermühleweiher
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Geographical location	Bodenseekreis , Baden-Wuerttemberg , Germany
Tributaries	Upper course of the Riedbach , rises at Missenhardt as a slope spring
Drain	Riedbach or also: Stadtbach → Tobelbach  → Schussen  → Lake Constance  → Rhine  → North Sea
Places on the shore	Tettnang
Data
Coordinates	47 ° 40 '12.2 "  N , 9 ° 35' 41.9"  E Coordinates: 47 ° 40 '12.2 "  N , 9 ° 35' 41.9"  E
Altitude above sea level	472.7  m above sea level NHN
surface	0.853 4  ha
volume	30,700 m³
Maximum depth	4.4 m
Middle deep	3.5 m
Catchment area	1 km²

The Obermühleweiher is a still water in the area of ​​the Baden-Württemberg city ​​of Tettnang in the Lake Constance district in Germany.

location and size

The privately owned pond is east of Tettnang city center and south of Wangener Strasse at an altitude of 472.7  m above sea level. NHN . The pond is also the city of Bach mentioned Riedbach flowed through, the upper reaches of Tobel Bach , the west below the city to Schussen drained. Weiher and the associated "upper mill" were already mentioned in the 13th century , today the water still drives a turbine .

The area of ​​the roughly rectangular pond is 0.85  hectares , the length about 120 meters, the width about 80 meters. It is on average 3.5 and up to 4.4 meters deep and holds 30,700 cubic meters of water. The bank is about 400 meters long. The approximately 100 hectare catchment area extends from the southeast sector of the urban area of ​​Tettnang into the adjoining corridor.

Grow for the shallow shore areas silting zones typical plants. 75 percent of the catchment area is used for agriculture, of which 30% is grassland, 10% arable land and 60% is planted with hops and fruit.

ecology

Since 2005, the Obermühleweiher has been part of the action program for the rehabilitation of Upper Swabian lakes .

Plant nutrients and other trophy indicators

year	2006	2011	Trophy level
Total PO 4 - phosphorus (µg / l)	23	28	mesotrophic
total inorganic nitrogen (mg / l)	7.47	9.72
Chlorophyll a (µg / l)	7th	8th	meso- / eutrophic
Chlorophyll a peak (µg / l)	14th	15th	mesotrophic
Viewing depth (m)	3.2	2.9	meso- / eutrophic

With the help of the action program, the following proposals for improving water quality were developed: the extensification of critical agricultural areas and a central sewage connection.

Flora and fauna

In the Obermühleweiher and its shoreline, in addition to the yellow pond rose ( Nuphar lutea ), there are also pine fronds ( Hippuris vulgaris ) and Berchtold's dwarf pondweed ( Potamogeton berchtoldii ). Furthermore, different types of algae live in the pond.
The fauna includes glass water fleas ( Daphnia longispina ), carp , roach , rudd and trout.

Individual evidence

1. ↑ Data record entry area on the still waters map of the LUBW map services.
2. ↑ ^{a b c d e f} Table entry on the website of the action program ...

Web links

• State Institute for the Environment Baden-Württemberg (LUBW) ( Notes )
• Geoportal Baden-Württemberg ( information )
• Information about the Obermühleweiher in the action program for the rehabilitation of Upper Swabian lakes
• Topographic map 1: 25.00, sheet no.8323