Rohrsee (Bad Wurzach)
|Rohrsee - view to the northeast|
|Geographical location||Bad Wurzach , Ravensburg District , Baden-Württemberg , Germany|
|Tributaries||Rohrbach and drainage ditches|
|Drain||via groundwater flows,
partly towards Wolfegger Ach → Schussen → Rhine → North Sea
partly towards Wurzacher Ach → Aitrach → Iller → Danube → Black Sea
|Places on the shore||Rohr , Rohrbach|
|Altitude above sea level|
|Maximum depth||2.0 m|
|Middle deep||1.2 m|
The approximately 55 hectare “Rohrsee” lies at an altitude of , around six kilometers southwest of the city center of Bad Wurzach , between the districts of Rohrbach in the east and Rohr in the south and the Molpertshaus belonging to Wolfegg in the west.
The lake, which formed in a dead ice hole around 16,000 years ago at the end of the last glacial period , now has a catchment area of 695 hectares. The size of the water surface is 55.1 hectares , with an average depth of 1.2 meters and a maximum depth of 2.0 meters, the volume is around 646,000 cubic meters.
The main inflow of the lake is through several ditches and the Rohrbach from the southeast, the outflow on the one hand to Wolfegger Ach and Schussen in Lake Constance and thus to the Rhine and ultimately into the North Sea , on the other hand via the Wurzacher Ach , Aitrach and Iller to the Danube and thus into the black Sea .
The lake dries up in some years, most recently in 1969 and 1972. The water level is currently stable at a rather high level.
As in other small still waters in Central Europe, grass carp were also released in the Rohrsee towards the end of the 1960s , which in a few years greatly reduced the population of aquatic plants. Since these fish species were completely fished in the late 1980s, the macrophyte population has recovered and with it the population of autochthonous fish species such as pike , roach , rudd , perch , tench and truffle . At the moment the lake is managed by a commercial fisherman, the main focus is on pike spawning.
From 1989 to 2010 Bad Wurzach was involved with the "Rohrsee" in the action program for the rehabilitation of Upper Swabian lakes . 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.
10 percent of the lake's catchment area is used for forest and 80 percent for agriculture - 66 percent of which is green and 34 percent arable land.
|Total PO 4 - phosphorus (µg / l)||85||62||86||79||54||52||48||31||39|
|Chlorophyll a (µg / l)||-||6.8||6.9||5||11||12||9||9||16|
|Chlorophyll a peak (µg / l)||-||20th||25th||9||50||26th||40||15th||38|
|total inorganic nitrogen a (mg / l)||0.39||0.09||0.35||-||0.48||0.41||0.47||0.12||0.32|
|Viewing depth (m)||-||2.1||> 2.5||> 2.5||> 2.5||> 2.5||> 2.5||> 2.5||> 2.5|
- Top25 Viewer - [Top. Map 1: 25000 Baden-Württemberg (South)]
- Action program for the rehabilitation of Upper Swabian lakes