Small Ursee

Small Ursee
The "Little Ursee" with wet meadows
Geographical location	Ravensburg district , Baden-Württemberg , Germany
Tributaries	Five drainage ditches
Drain	Artificial ditch → Großer Ursee → 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 '25 "  N , 10 ° 1' 24"  E Coordinates: 47 ° 45 '25 "  N , 10 ° 1' 24"  E
Altitude above sea level	694.9  m above sea level NHN
surface	5.5 ha
volume	192,000 m³
Maximum depth	5.9 m
Middle deep	3.5 m
Catchment area	95 ha
particularities	Action program for the rehabilitation of Upper Swabian lakes

The Small Ursee is a 5.5  hectare large pond near the town Isny in Baden-Württemberg district Ravensburg .

Emergence

The lake, like the Great Ursee further south , 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 6.7 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 Kleiner Ursee has a size of around 95 hectares. With a size of 5.5 hectares, an average depth of 3.5 meters and a maximum depth of 5.9 meters, the volume of the lake is around 192,000 cubic meters.

The Kleine Ursee is fed by five drainage ditches.
The process takes place through an artificial ditch into the Großer Ursee and from there over the Fetzachgraben , Eschach , Aitrach and Iller into the Danube and thus into the Black Sea .

ecology

Since 2000, Leutkirch im Allgäu (catchment area only) and Isny ​​with the Kleiner Ursee have been involved in the action program for the rehabilitation of Upper Swabian lakes . 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.

The catchment area of ​​the lake is used 50 percent for forest and 35 percent for agriculture - 100% of which is grassland.

Plant nutrients and other trophy indicators

year	2000	2004	2010
Total PO 4 - phosphorus (µg / l)	52	52	51
Chlorophyll a (µg / l)	23	29	9
Chlorophyll a peak (µg / l)	34	75	17th
Total inorganic nitrogen a (mg / l)	0.45	-	0.55
Viewing depth (m)	1.0	1.3	0.9

Web links

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

Individual evidence

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