Great Ursee

Great Ursee
The "Great Ursee"
Geographical location	Ravensburg district , Baden-Württemberg , Germany
Tributaries	Drainage ditches, drainage of the "Kleiner Ursee" and "Gießbächle"
Drain	Fetzachgraben → Eschach → Aitrach → Iller → Danube → Black Sea
Places on the shore	Beuren
Location close to the shore	Isny in the Allgäu
Data
Coordinates	47 ° 45 '8 "  N , 10 ° 1' 27"  E Coordinates: 47 ° 45 '8 "  N , 10 ° 1' 27"  E
Altitude above sea level	694.9  m above sea level NHN
surface	19.4 ha
volume	859,000 m³
Maximum depth	9.8 m
Middle deep	4.4 m
Catchment area	2.08 km²
particularities	Action program for the rehabilitation of Upper Swabian lakes

The Great Ursee is 19.4  hectares large pond near the town Isny in Baden-Württemberg district Ravensburg .

Emergence

The lake, like the Kleine Ursee further to the north , was created in a former dead ice hole on the inner edge of the outer young moraine .

location

It lies at an altitude of 694.9  m above sea level. NHN , around six and a half kilometers north of Isny ​​and northeast of the Beuren district .
To the east of the two lakes is the moor and nature reserve " Taufach-Fetzachmoos ", a very varied area with numerous rare animal and plant species. The originally strong height differences in the terrain were leveled out by the growing bog.

Hydrology

The catchment area of ​​the privately owned Great Ursee has a size of around 208 hectares (ha). With a size of 19.4 ha, an average depth of 4.4 meters and a maximum depth of 9.8 m, the volume of the lake is around 859,000 cubic meters.

The Große Ursee is fed by the course of the Kleiner Ursee, the Gießbächle coming from Beuren and around 20 drainage ditches in the west and south.
The process takes place over the Fetzachgraben , the Eschach , the Aitrach and the Iller into the Danube and thus into the Black Sea .

ecology

Since 2000, Leutkirch im Allgäu (catchment area only) and Isny ​​have been involved in the action program for the rehabilitation of Upper Swabian lakes with the “Großer Ursee” . An important goal of this program is to reduce nutrient inputs into streams , lakes and ponds and thereby improve and maintain the condition of the water bodies.

15 percent of the lake's catchment area is used for forest and 70 percent for agriculture - 100% of which is grassland.

Plant nutrients and other trophy indicators

year	2000	2001	2008	2013
Total PO 4 - phosphorus (µg / l)	93	75	78	56
Chlorophyll a (µg / l)	39	40	63	20th
Chlorophyll a peak (µg / l)	70	61	105	41
Total inorganic nitrogen a (mg / l)	0.47	-	0.49	0.29
Viewing depth (m)	0.7	0.6	0.6	1.0

Web links

• The Great Ursee in the action program for the rehabilitation of Upper Swabian lakes

Individual evidence

1. ↑ Top25 Viewer - [Top. Map 1: 25000 Baden-Württemberg (South)]