Raderacher Weiher

Raderacher Weiher
Geographical location	Friedrichshafen Bodenseekreis Baden-Wuerttemberg Germany
Tributaries	an inlet and slope springs
Drain	Mühlbach  → Brunnisach  → Rhine  → North Sea
Places on the shore	Raderach
Data
Coordinates	47 ° 42 '4 "  N , 9 ° 25' 57"  E Coordinates: 47 ° 42 '4 "  N , 9 ° 25' 57"  E
Altitude above sea level	443  m above sea level NHN
surface	2.1 ha / 1.8 ha
volume	13500 m³ / 22100 m³
Maximum depth	1.0 m / 2.0 m
Middle deep	0.9 m / 1.2 m
Catchment area	95 ha
particularities	two ponds FFH , NSG

The Raderacher Weiher are two still waters in the area of ​​the Baden-Württemberg city ​​of Friedrichshafen in the Lake Constance district in Germany .

location

The 2.1 and 1.8 hectares large Rader Acher pond , about 6.3 kilometers northwest of Friedrichshafen town center at an altitude of around 443  meters above sea level. Located near the NHN , they naturally belong to the Lake Constance basin . Today they are used for fishing purposes.

Hydrology

The Raderacher Weiher were created after the Second World War by overflowing a large silting bog within the Hepbacher-Leimbacher Ried . Their catchment area extends to 95 hectares. The size of the water areas is 2.1 and 1.8 hectares, with average depths of 0.9 and 1.2 meters and maximum depths of 1.0 and 2.0 meters result in volumes of around 13,500 and 22,100 cubic meters, respectively  .

The tributaries come from hillside springs, the smaller, southern pond is fed by the northern pond. The runoff takes place via Mühlbach and Brunnisach to Lake Constance and thus into the Rhine .

ecology

Since 1989, Friedrichshafen is the Rader Acher ponds on the action program for the rehabilitation of Upper Swabian lakes involved. 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 Raderacher Weiher is used 40 percent for forest and 60 percent for agriculture - of which 40% grassland, 30% arable land and 30 percent special crops (fruit growing).

Plant nutrients and other trophy indicators in the northern pond

year	1995	1996	1998 *	1999 *	2000 *	2002	2008	2013
Total PO 4 - phosphorus (µg / l)	85	80	150	158	104	106	90	78
Chlorophyll a (µg / l)	27	15th	39	54	39	47	46	27
Chlorophyll a peak (µg / l)	62	69	102	81	70	115	152	78
total inorganic nitrogen a (mg / l)	0.26	0.17	0.75	0.45	0.84	0.68	0.22	0.26
Viewing depth (m)	1.2	1.7	1.4	0.7	0.6	0.8	> 1.2	1.7
* only six measurements each

Web links

• Action program for the rehabilitation of Upper Swabian lakes