Girasweiher

Girasweiher
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Geographical location	Ravensburg district , Baden-Württemberg , Germany
Tributaries	Trenches
Drain	Mahlbach → Wolfegger Ach → Schussen → Rhine → North Sea
Places on the shore	Giras , widower
Location close to the shore	Bergatreute
Data
Coordinates	47 ° 50 '28.7 "  N , 9 ° 46' 2"  E Coordinates: 47 ° 50 '28.7 "  N , 9 ° 46' 2"  E
Altitude above sea level	599  m above sea level NHN
surface	1.1 ha
volume	14,100 m³
Maximum depth	2.4 m
Middle deep	1.3 m
Catchment area	6 ha
particularities	Action program for the rehabilitation of Upper Swabian lakes

The Girasweiher is a 1.1  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 599  m above sea level. NHN and around 1.8 kilometers south-east of Bergatreut town center, near the hamlets of Giras in the south-east and Witschwende in the north-west.

Hydrology

The pond has a catchment area of ​​around six hectares. With a size of 1.1 hectares, an average depth of 1.3 meters and a maximum depth of 2.4 meters, the volume of the lake is around 14,100 cubic meters.

The “Girasweiher” is fed via small ditches and the elf pond to the northeast .
The "Girasweiher" runs over the Mahlbach and Mahlweiher into the Wolfegger Ach to Lake Constance and thus into the Rhine and ultimately into the North Sea .

ecology

Bergatreute has been involved in the action program for the rehabilitation of Upper Swabian lakes with the “Girasweiher” since 2000 . 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.

The catchment area of ​​the pond is used 25 percent for forest and 75 percent for agriculture - of which 78% grassland and 22% arable land.

Plant nutrients and other trophy indicators

year	2000	2001	2008	2013
Total PO 4 - phosphorus (µg / l)	66	75	130	53
Chlorophyll a (µg / l)	25th	70	132	13
Chlorophyll a peak (µg / l)	61	220	288	46
total inorganic nitrogen a (mg / l)	-	4.20	3.58	7.07
Viewing depth (m)	1.6	1.5	0.9	2.5

Web links

• The "Girasweiher" 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)]