Elven pond

Elven pond
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Geographical location	Ravensburg district , Baden-Württemberg , Germany
Tributaries	Trenches
Drain	Girasweiher → Mahlweiher → Wolfegger Ach → Schussen → Rhine → North Sea
Places on the shore	Giras , widower
Location close to the shore	Bergatreute
Data
Coordinates	47 ° 50 '33.6 "  N , 9 ° 46' 6.4"  E Coordinates: 47 ° 50 '33.6 "  N , 9 ° 46' 6.4"  E
Altitude above sea level	599  m above sea level NHN
surface	2.2 ha
volume	37,100 m³
Maximum depth	3.9 m
Middle deep	1.7 m
Catchment area	1.41 km²
particularities	Action program for the rehabilitation of Upper Swabian lakes

The elves Weiher is a 2.2  hectare large pond in the area of Baden-Wuerttemberg community Bergatreute in the district of Ravensburg in Germany .

location

The owned by the Foundation Liebenau located pond is located at a height 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 141 hectares. With a size of 2.2 hectares, an average depth of 1.7 meters and a maximum depth of 3.9 meters, the lake volume is around 37,100 cubic meters.

The “Elfenweiher” is fed by two ditches that run from the northeast.
The “Elfenweiher” takes place over the Girasweiher , Mahlweiher 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 “Elfenweiher” . 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.

35 percent of the pond's catchment area is used for forest and 55 percent for agriculture - 65% of which is grassland and 32% arable land.

Plant nutrients and other trophy indicators

year	2000	2001	2008
Total PO 4 - phosphorus (µg / l)	62	101	168
Chlorophyll a (µg / l)	24	82	149
Chlorophyll a peak (µg / l)	52	199	311
total inorganic nitrogen a (mg / l)	-	4.50	3.75
Viewing depth (m)	1.6	1.2	0.9

Web links

• The "Elfenweiher" 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)]