Mahlweiher (Bergatreute)

Mahlweiher
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Geographical location	Ravensburg district , Baden-Württemberg , Germany
Tributaries	Expiry of the Girasweiher
Drain	Mahlbach → Wolfegger Ach → Schussen → Rhine → North Sea
Places on the shore	Giras , widower
Location close to the shore	Bergatreute
Data
Coordinates	47 ° 50 '19 "  N , 9 ° 46' 8"  E Coordinates: 47 ° 50 '19 "  N , 9 ° 46' 8"  E
Altitude above sea level	598  m above sea level NHN
surface	1.3 ha
length	310 m
width	55 m
volume	15,300 m³
scope	750 m
Maximum depth	2.4 m
Middle deep	1.2 m
Catchment area	19 ha
particularities	Action program for the rehabilitation of Upper Swabian lakes

The Mahlweiher is a 1.3 hectare large pond in the area of Baden-Wuerttemberg community Bergatreute in the district of Ravensburg in Germany .

location

The privately owned pond is at an altitude of about 598  m above sea level. NHN and around two kilometers southeast of the Bergatreut town center, near the hamlets of Giras in the east and Talmühle in the south.

Hydrology

The pond has a catchment area of ​​around 19 hectares. With a size of 1.3 hectares, an average depth of 1.2 meters and a maximum depth of 2.4 meters, the lake volume is around 15,300 cubic meters.

The “Mahlweiher” is mainly fed by the Girasweiher to the north .
The "Mahlweiher" runs over the Mahlbach and Wolfegger Ach to Lake Constance and thus into the Rhine and ultimately into the North Sea .

ecology

Since 2000 Wolfegg (catchment area only) and Bergatreute have been involved in the action program for the rehabilitation of Upper Swabian lakes with the “Mahlweiher” . An important goal of this program is to reduce nutrient inputs in streams , lakes and ponds and thereby improve and maintain the condition of the water bodies.

15 percent of the pond's catchment area is used for forest and 75 percent for agriculture - 67% of which is grassland and 33% arable land.

Plant nutrients and other trophy indicators

year	2000	2001	2008	2013
Total PO 4 - phosphorus (µg / l)	77	69	94	48
Chlorophyll a (µg / l)	39	63	116	21st
Chlorophyll a peak (µg / l)	75	161	281	57
total inorganic nitrogen a (mg / l)	-	3.87	3.06	6.25
Viewing depth (m)	1.4	1.5	0.9	2.5

Flora and fauna

In the pond, in which eel , perch, pike , carp, roach , rudd , tench and catfish are used, yellow pond rose , rough horn leaf , pine frond and white water lily grow .

Web links

• The "Mahlweiher" in the action program for the rehabilitation of Upper Swabian lakes

Individual evidence

1. ↑ height calculation in www.deine-berge.de
2. ↑ Top25 Viewer - [Top. Map 1: 25000 Baden-Württemberg (South)]